CN111807539B

CN111807539B - Composite filter element and water purifier system

Info

Publication number: CN111807539B
Application number: CN202010782549.6A
Authority: CN
Inventors: 申鸿海; 舒毅; 高威; 李冠轩; 秦利利; 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: 2024-08-20
Anticipated expiration: 2040-08-06
Also published as: CN111807539A

Abstract

The invention relates to a composite filter element and a water purifier system, wherein the composite filter element comprises a filter flask, and an isolation assembly is arranged in the filter flask and used for dividing a space in the filter flask into a first filter cavity and a second filter cavity which are mutually independent. The first filter cavity is internally provided with a preposed filter element component, and the second filter cavity is internally provided with a coiled membrane central tube and a membrane type filter layer. The membrane filtration layer and the side wall of the second filtration cavity are separated to form a pressurized water gap. When the pressurized water inlet is used for pressurizing the pressurized water gap to increase the water yield of the membrane filter layer, water channeling can not occur between the first filter cavity and the second filter cavity, so that the filtration process can be normally performed. And the coiled membrane center tube comprises a rear filter element and end covers arranged at two ends of the rear filter element, the membrane filter layer is sleeved on the coiled membrane center tube, and a diversion trench is arranged at the position covered by the membrane filter layer on the end covers, so that water obtained by filtering the membrane filter layer can be led to the rear filter element, and the water yield is further improved.

Description

Composite filter element and water purifier system

Technical Field

The invention relates to the technical field of water purification, in particular to a composite filter element and a water purifier system.

Background

With the continuous development of the water purification technology field, the water purifier gradually tends to be miniaturized and integrated. In other words, in order to make the water purifier more compact and lightweight, the multi-stage filter cartridge is integrated into one filter flask. The raw water is filtered by each stage of filter element in the filter flask, so that the target water quality can be achieved, and the user requirements are met. However, for the filter element with higher integration, the space is limited based on the filter flask, and the water yield of the whole filter element is lower when the integration level is higher.

Disclosure of Invention

Based on this, it is necessary to provide a composite filter element and a water purifier system for the problem of low water yield.

The utility model provides a composite filter element, includes the filter flask, be equipped with isolation component in the filter flask, be used for with the space in the filter flask is cut apart into mutually independent first filter chamber and second filter chamber, be equipped with leading filter element assembly in the first filter chamber, the filter flask be equipped with all with the raw water inlet and the leading filtration delivery port of first filter chamber intercommunication, follow raw water inlet gets into the raw water process leading filter element assembly filters the leading filtration delivery port that obtains after the back, be equipped with in the second filter chamber and roll up membrane center tube and diaphragm type filter layer, it includes the postposition filter core and sets up to roll up the membrane center tube be in the end cover at postposition filter core both ends, the diaphragm type filter layer cover is in on the roll up membrane center tube, by the position that the diaphragm type filter layer covers on the outer peripheral face of end cover is equipped with the guiding gutter, liquid in the guiding gutter can flow in postposition filter core, the diaphragm type filter layer with the interval forms the pressurized water clearance between the lateral wall of second filter chamber, pressurized water clearance with the raw water filter layer intercommunication, pressurized water inlet and pressurized water filter layer are equipped with pressurized water clearance intercommunication.

The above-mentioned scheme provides a compound filter core, utilizes isolation component will space in the filter flask is cut apart into mutually independent first filter chamber with the second filter chamber, and then when through the pressurization water inlet to pressurization in the pressurization water clearance, and then increase the water yield of diaphragm type filter layer, first filter chamber with the condition that scurrying water can not appear between the second filter chamber for the process filtration process can normally go on, thereby promotes the water yield of compound filter core. The first filter cavity and the second filter cavity are completely independent, and even if deformation of the filter flask is realized due to large pressure in the pressurized water gap, the independence between the first filter cavity and the second filter cavity is not influenced, so that water channeling is effectively avoided. After the water yield of the membrane filter layer is increased, in order to enable water obtained by filtering of the membrane filter layer to flow to the rear filter element for further filtering as soon as possible, the end cover is further provided with the diversion trench, so that the water obtained by filtering the part of the membrane filter layer corresponding to the end cover can flow to the rear filter element through the diversion trench, the water yield of the membrane filter layer is fully excited, and the water yield of the composite filter element is improved. The situation that water formed by filtration cannot be led out in too many places on the membrane filter layer, so that pressure is too high to sufficiently excite the water production capacity formed by membrane filtration is avoided.

In one embodiment, the isolation assembly is of a sealed shell structure, an inner space surrounded by the isolation assembly is the first filter cavity, and the second filter cavity is surrounded between the filter flask and the isolation assembly;

or the inner space surrounded by the isolation assembly is the second filter cavity, and the first filter cavity is surrounded between the filter flask and the isolation assembly.

In one embodiment, the isolation assembly comprises a cylinder and a cylinder cover, wherein the cylinder cover is in sealing connection with an opening of the cylinder.

In one embodiment, the cylinder body and the cylinder cover are welded and sealed, or an annular mounting groove is formed in the position, opposite to the opening end of the cylinder body, of the cylinder cover, the cylinder body is inserted into the annular mounting groove, and a sealing piece is arranged between the cylinder body and the side wall of the annular mounting groove.

In one embodiment, the side wall of the isolation assembly and the side wall of the filter flask are arranged at intervals to form a water passing gap, a first flow guide rib is arranged outside the side wall of the isolation assembly, and the first flow guide rib is located between the side wall of the filter flask and the side wall of the isolation assembly.

In one embodiment, when the inner space surrounded by the isolation assembly is the second filter cavity, the filter flask and the isolation assembly enclose the first filter cavity, the composite filter element further comprises a front central pipe, the first filter cavity and the second filter cavity are sequentially distributed in the axial direction of the filter flask, the raw water inlet and the front filter water outlet are both positioned on the end wall of the first end of the filter flask, the part on the filter flask used for forming the first filter cavity is the second end, the front filter element assembly and the side wall of the filter flask are arranged at intervals to form a raw water gap, the raw water inlet and the raw water gap are communicated through the water gap, water through holes are formed in the two end walls of the isolation assembly, one end of the front central pipe is communicated with the front filter water outlet, the front central pipe penetrates through the water through holes and is inserted into the front filter element assembly, and the center of the coiled film is outside the front central pipe.

In one embodiment, the filter further comprises a front central tube, the raw water inlet is located on the end wall of the first end of the filter flask, the first filter cavity and the second filter cavity are sequentially distributed in the axial direction of the filter flask, the part of the filter flask used for forming the first filter cavity is a second end, a raw water gap is formed between the front filter element assembly and the side wall of the first filter cavity at intervals, one end of the front central tube is communicated with the raw water inlet, the front central tube penetrates through the second filter cavity and then is inserted into the first filter cavity, and one end of the front central tube inserted into the first filter cavity is communicated with the raw water gap.

In one embodiment, when the inner space surrounded by the isolation assembly is the second filter cavity, and the first filter cavity is surrounded between the filter flask and the isolation assembly, water passing jacks are arranged on two end walls of the isolation assembly, and the front central tube passes through the two water passing jacks and then is inserted into the first filter cavity.

In one embodiment, the composite filter element further comprises a guide central tube, the pre-filtration water outlet is located on the end wall of the first end of the filter flask, one end of the pre-filtration element assembly is abutted to the end wall of the isolation assembly, a pre-end cover is arranged at the other end of the pre-filtration element assembly, pre-water through holes penetrating through two end surfaces of the pre-end cover are formed in the pre-end cover, a gap is formed between the pre-end cover and the end wall of the second end, so that the pre-water through holes are communicated with the raw water gap, the pre-central tube is communicated with the pre-water through holes, the pre-central tube is arranged at intervals with the side wall of the water through holes, the guide central tube is sleeved outside the pre-central tube, the coiled film central tube is sleeved outside the guide central tube, a pre-filtration water gap is formed between the guide central tube, the guide central tube is communicated with the water through holes far away from the first end, and the pre-filtration water through holes are communicated with the water through holes.

In one embodiment, when the inner space surrounded by the isolation assembly is the first filter cavity, and the second filter cavity is surrounded between the filter flask and the isolation assembly, a water passing jack is arranged on the end wall, close to the raw water inlet, of the isolation assembly, and the front central pipe passes through the water passing jack and then is inserted into the first filter cavity.

In one embodiment, the composite filter element further comprises a guide central tube, the pre-filtration water outlet is located on the end wall of the first end of the filter flask, one end of the pre-filtration filter element assembly is tightly propped against the end wall of the water passing jack arranged on the isolation assembly, a pre-filtration end cover is arranged at the other end of the pre-filtration filter element assembly, the pre-filtration end cover is provided with a pre-filtration water hole, a gap is arranged between the pre-filtration end cover and the end wall of the isolation assembly, so that the pre-filtration water hole is communicated with the raw water gap, the pre-filtration central tube is communicated with the pre-filtration water hole, the pre-filtration central tube is arranged with the side wall of the water passing jack at intervals, the guide central tube is sleeved outside the pre-filtration central tube, the coiled membrane central tube is sleeved outside the guide central tube, the guide central tube is arranged with the pre-filtration central tube at intervals to form a pre-filtration water gap, the guide central tube is communicated with the water passing jack, and one end of the pre-filtration water gap is far away from the water passing jack and is communicated with the pre-filtration water outlet.

In one embodiment, the end wall of the first end is provided with a concentrated water outlet and a purified water outlet, the concentrated water outlet of the membrane filter layer is communicated with the concentrated water outlet, the guide central tube and the coiled membrane 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 the ultrafiltration membrane is intercepted between the rear filter element and the clean water outlet.

In one embodiment, the axial length of the post-filter element is H1, the axial length of the membrane filter layer is H1, and the H1/H1 is 30% -70%.

In one embodiment, the portion of the outer peripheral surface of the end cover covered by the membrane filter layer comprises a water sealing area, the membrane filter layer is connected with the end cover at the water sealing area, and the diversion trench is positioned at one side of the water sealing area, which is close to the rear filter element.

The water purifier system comprises the composite filter element, wherein a pressurizing passage is arranged between the pre-filtering water outlet and the pressurizing water inlet, and a pressurizing water pump is arranged on the pressurizing passage.

The above-mentioned scheme provides a purifier system, through adopting the compound filter core of arbitrary embodiment in the aforesaid to make in the first filter chamber the leading filtration water that passes through leading filter core filters can be in the pressurization passageway by the pressurization water pump is pressurized the back get into the pressurization water clearance, thereby promote the water yield of diaphragm type filter layer. In the pressurizing process of the pressurizing water gap, the first filter cavity and the second filter cavity are obtained by being divided by the isolation assembly, and the two filter cavities are independent of each other, so that water channeling caused by deformation of the filter flask during pressurizing can be avoided. And the diversion trench is further arranged on the end cover, so that the water production capacity of the membrane filter layer can be fully excited, and the water production capacity of the water purifier system is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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 the direction A-A in FIG. 1;

FIG. 3 is a cross-sectional view of the roll film center tube according to the present embodiment;

FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 3;

FIG. 5 is a cross-sectional view of a coiled center tube according to 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 the direction C-C in FIG. 6;

FIG. 8 is a cross-sectional view of a composite cartridge according to another embodiment;

FIG. 9 is an exploded view of the composite cartridge of FIG. 6;

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

FIG. 11 is a schematic illustration of the assembled isolation assembly and pre-cartridge assembly of the composite cartridge of FIG. 10;

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

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

FIG. 14 is an exploded view of the composite cartridge of FIG. 10;

fig. 15 is a system diagram of a water purifier system according to the present embodiment;

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

Reference numerals illustrate:

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. raw water gap; 114. leading a filtering water gap; 115. pressurized water gap; 116. a water purifying gap; 12. a pre-filter element assembly; 13. a front central tube; 14. dividing the end cover; 141. a water passing jack; 15. guiding the central tube; 16. an ultrafiltration membrane; 17. a front end cover; 171. leading a water hole; 18. an adapter sleeve; 19. a water seal; 20. a membrane filtration assembly; 21. a coiled film central tube; 211. a rear filter element; 212. an end cap; 2121. a diversion trench; 22. a membrane filtration layer; 221. a water sealing area; 23. a support frame; 231. a water passing hole; 30. an isolation assembly; 31. a cylinder; 311. a first flow guide rib; 32. a cylinder cover; 40. a water purifier system; 41. a pressurization passage; 411. a pressurized water pump; 412. a first electromagnetic valve; 42. a water purifying passage; 421. a pressure sensing member; 422. a one-way valve; 43. an additional passage; 44. a concentrated water passage; 441. a concentrated water electromagnetic valve; 45. a water tap.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended 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 be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

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

The membrane filter layer 22 and the post filter element 211 are integrated together in the sleeved mode, so that the integration level of the membrane filter assembly 20 is improved, the end covers 212 at the two ends of the post filter element 211 can also provide an acting point for the arrangement of the membrane filter layer 22, and when the membrane filter layer 22 is sleeved on the coiled membrane central tube 21, the membrane filter layer 22 is connected with the outer peripheral surface of the end covers 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 rolled membrane central tube 21, and the rolling starting edge of the reverse osmosis membrane filter layer is connected with the outer peripheral surface of the end cover 212 in the rolling process. Or the membrane filter layer 22 can also be a nanofiltration membrane filter layer, and the nanofiltration membrane filter layer is sleeved on the coiled membrane central tube 21. The nanofiltration membrane filtration layer is connected to the outer peripheral surface of the end cap 212.

Specifically, as shown in fig. 2 and 3, the portion of the outer peripheral surface of the end cap 212 covered by the membrane filtration layer 22 includes a water sealing area 221, and the membrane filtration layer 22 is connected to the end cap 212 at the water sealing area 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 connected.

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

In this case, the axial length of the post-filter element 211 is set to be 30% to 70% of the axial length of the membrane filter layer 22, compared to the case where two filter elements that are mutually sleeved in a general integrated filter element are set to have the same axial length. On the one hand, the filtering capacity of the post-filter element 211 can meet the requirement of further filtering of the water obtained by filtering of the membrane filter 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, the water production capacity of the membrane filtration layer 22 and the production capacity of the post-filter element 211 are compared, the axial length H1 of the post-filter element 211 is only required 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 water obtained by filtering the membrane filtration layer 22, so as to meet the filtering requirement. The condition that the redundancy of the post-filter element 211 is large and the utilization rate is low due to the fact that the axial length of the post-filter element 211 is too long relative to the membrane filter layer 22 is avoided. And compared with the manufacturing cost of the end cover 212, the manufacturing cost of the post-filter element 211 is higher, the used material is fragile, and the strength is lower, so that the axial length of the post-filter element 211 is reduced and the axial length of the end cover 212 is increased under the condition of meeting the filtering requirement, thereby reducing the overall manufacturing cost, improving the strength of the coiled film central tube 21 and improving the stability.

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

So that the portion of the membrane filter layer 22 overlying the end cap 212 can pass through the channels 2121 to the post-filter element 211 for further filtration. In other words, the portion of the membrane filter layer 22 opposite to the post-filter element 211 can perform a filtering function to generate water, and the portion corresponding to the end cap 212 can also participate in the filtering process to guide out the filtered water, thereby improving the water flow rate of the membrane filter layer 22. On the basis of the longer axial length of the end cap 212, the membrane filter layer 22 covers more portions on the outer circumferential surface of the end cap 212, and the diversion groove 2121 is further provided to further fully utilize the water producing capacity of the portion on the membrane filter layer 22, so that the situation that too much pressure is generated due to the fact that water formed by filtration cannot be led out at too many places on the membrane filter layer 22 is avoided. And further, under the condition of fully balancing the water production capacity, the cost is effectively controlled, and the water production flow of the whole membrane filter assembly 20 is ensured.

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

Or when the end cap 212 is at least partially sleeved outside the post-filter element 211, although the end surface of the portion of the end cap 212 sleeved outside the post-filter element 211 may not directly collide with the post-filter element 211, but is looped outside the post-filter element 211. However, since this end face surrounds the post-filter element 211, water flowing out of this end face in the channel 2121 may still enter the post-filter element 211, so that the channel 2121 may also extend to this end face.

Specifically, as shown in fig. 4 and fig. 5, an annular groove is formed in an end surface of the end cover 212 abutting against the post-filter element 211, and an end portion of the post-filter element 211 is inserted into the annular groove, so that stability of installation between the end cover 212 and the post-filter element 211 is improved, and meanwhile, water in the diversion trench 2121 on the outer peripheral surface of the end cover 212 flows into the post-filter element 211 more easily, and further filtration is performed.

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

If the radial thickness of the post-filter element 211 is consistent with the thickness of the annular groove, in other words, the end of the post-filter element 211 is not cut, and may be directly inserted into the annular groove, the outer diameter of the post-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 collide with the rear filter element 211, but the diversion groove 2121 may extend to the end surface, and at this time, the water in the diversion groove 2121 may flow into the rear filter element 211.

More specifically, in one embodiment, as shown in FIG. 3, the channels 2121 are disposed axially of the membrane filtration layer 22. The number of the diversion trenches 2121 is plural, the diversion trenches 2121 are distributed at intervals in the circumferential direction of the outer circumferential surface of the end cover 212, and water formed by filtering at each part in the circumferential direction of the membrane type filter layer 22 around the outer circumferential surface of the end cover 212 is uniformly conducted to the rear filter element 211, so that the overall water flow rate is improved.

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

Specifically, the rear filter element 211 is a water-permeable microporous filter element, so that the water-permeable capacity of each position of the rear filter element 211 is relatively balanced, and the water-permeable microporous filter element can effectively improve the water-permeable uniformity compared with the case that water is filled through water through holes arranged on a central tube.

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

As shown in fig. 5, in one embodiment, the post-filter 211 has a cylindrical structure, the end caps 212 are provided with through holes penetrating through both end surfaces, the through holes of the cylindrical structure are communicated with the through holes of the end caps 212 to form a middle through hole of the coiled film central tube 21, and purified water obtained by filtering the post-filter 211 flows out from the middle through hole. The post-filter element 211 is internally provided with a support frame 23, the support frame 23 is supported on the inner peripheral surface of the post-filter element 211, and the support frame 23 is provided with water passing holes 231. The support frame 23 plays a supporting role on the rear filter element 211, so that the condition that the rear filter element 211 is damaged due to the fact that the pressure applied to the outside of the rear filter element 211 is large is avoided. Particularly, when the post-filter element 211 is the carbon rod, the carbon rod is made of brittle material, and the pressure bearing capacity of the carbon rod is improved by the arrangement of the supporting frame 23, so that the service life of the post-filter element 211 is effectively prolonged. The water passing holes 231 on the supporting frame 23 are convenient for the purified water formed by the filtration of 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 area 221 near the post-filter element 211. So that the water sealing area 221 can only enable the water obtained by filtering on the part of the membrane filter layer 22 corresponding to the diversion trench 2121 to flow to the post-filter element 211.

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

Therefore, the part of the membrane filter layer 22 covered on the outer peripheral surface of the end cover 212 can participate in the water production process of filtration, and the water formed by filtration can flow to the post filter element 211 through the diversion holes, and is further filtered by the post filter element 211 to obtain purified water. So that the cost is effectively controlled while the axial length of the post-filter element 211 is reduced, and the water production capacity of the whole membrane filter assembly 20 is ensured.

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

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

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

Further, as shown in fig. 6 to 8, the filter flask 11 is provided with a raw water inlet 1111. 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 prefilter water obtained by filtering through the prefilter member 12 can be filtered through the membrane filter layer 22 and the post filter 211 in this order to obtain purified water.

The filter flask 11 is provided with a purified water outlet 1115, and the purified water outlet 1115 is communicated with the outlet of the coiled membrane central tube 21, so that purified water filtered by the rear filter element 211 flows from the outlet of the coiled membrane central tube 21 to the purified water outlet 1115 and then flows out of the composite filter element 10 for a user to use.

Integrating the pre-filter element assembly 12, the membrane filter layer 22 and the post-filter element 211 into the filter flask 11 further improves the integration level of the composite filter element 10.

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

Or in another embodiment, as shown in fig. 10 to 13, the filter flask 11 is provided with an isolation assembly 30 for dividing the space in the filter flask 11 into a first filter cavity and a second filter cavity which are independent from each other. The pre-filter assembly 12 is positioned in the first filter chamber and the membrane filter assembly 20 is positioned in the second filter chamber. The membrane filter layer 22 and the side wall of the second filter cavity are separated to form a pressurized water gap 115, the pressurized water gap 115 is communicated with the raw water inlet of the membrane filter 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 to the pressurized water gap 115 through the pressurized water inlet 1113, the first filter cavity and the second filter cavity are independent from each other, so that the filter flask 11 is not deformed during pressurization, and the split end cover 14 for splitting and forming the two filter cavities is separated from the filter flask 11, thereby causing water channeling between the first filter cavity and the second filter cavity.

The filter flask 11 is provided with a pre-filtering water outlet 1112 which is communicated with the first filter cavity, the pre-filtering core component 12 is located between the raw water inlet 1111 and the pre-filtering water outlet 1112, raw water entering the first filter cavity is filtered by the pre-filtering core component 12 to obtain pre-filtering water, and the pre-filtering water flows out of the pre-filtering water outlet 1112.

Specifically, in one embodiment, as shown in fig. 10 to 13, the isolation assembly 30 is a sealed housing structure. In other words, the inner space surrounded by the isolation assembly 30 itself forms the first filter cavity or the second filter cavity, and the second filter cavity or the first filter cavity is surrounded 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 leak between the two filter cavities.

When the internal space surrounded by the isolation assembly 30 is the first filter cavity, the second filter cavity is surrounded between the filter flask 11 and the isolation assembly 30. The pre-filter element assembly 12 is disposed in the spacer assembly 30 with the membrane filtration layer 22 spaced from the sidewall of the filter flask 11 and/or the end wall of the spacer assembly 30 forming the pressurized water gap 115.

When the internal space surrounded by the isolation assembly 30 is the second filter cavity, the first filter cavity is surrounded between the filter flask 11 and the isolation assembly 30. The membrane filter assembly 20 is disposed in the second filter chamber, and the membrane filter 22 is spaced from the spacer assembly 30 to form the pressurized water gap 115.

In further detail, 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 the opening of the cylinder 31 to form the sealed housing structure.

Specifically, as shown in fig. 12, in one embodiment, a welded seal may be used between the cylinder 31 and the cylinder cover 32, so as to realize a sealed connection between the cylinder cover 32 and the opening of the cylinder 31. Therefore, no matter the pressure outside the cylinder 31 is larger, the cylinder 31 is subjected to inward extrusion force, or the pressure inside the cylinder 31 is larger, and the cylinder 31 and the cylinder cover 32 can be reliably connected. The tightness of the space surrounded by the cylinder 31 and the cylinder cover 32 is ensured, the mutual independence between the first filter cavity and the second filter cavity is ensured, and the water channeling condition is avoided.

Further, as shown in fig. 12, an annular mounting groove may be provided on the cap 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 cap 32 are further welded, so that the connection therebetween is more compact and reliable. Specifically, spin welding may be used between the cylinder 31 and the cylinder cover 32.

Or in another embodiment, as shown in fig. 13, an annular mounting groove is formed on the cylinder cover 32 at a position opposite to the opening end of the cylinder 31, the cylinder 31 is inserted into the annular mounting groove, and a sealing element is arranged between the cylinder 31 and the side wall of the annular mounting groove.

Based on the cylinder 31 being inserted in the annular mounting groove, and the sealing element being arranged between the cylinder 31 and the side wall of the annular mounting groove, when the cylinder 31 is pressed, the cylinder 31 and the cylinder cover 32 can still be connected together in a sealing way, and dislocation can not occur, so that mutual independence between the first filter cavity and the second filter cavity is ensured, and no water channeling condition can occur.

Further, as shown in fig. 10 and 11, the sidewall of the isolation assembly 30 and the sidewall of the filter flask 11 are spaced to form a water gap, a first guide rib 311 is disposed outside the sidewall of the isolation assembly 30, and the first guide rib 311 is located between the sidewall of the filter flask 11 and the sidewall 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 whole isolation assembly 30 is uniformly stressed and cannot deform and dislocate, and the sealing reliability of a sealing space surrounded by the isolation assembly 30 is ensured.

Further, in one embodiment, as shown in fig. 7-9, the composite filter cartridge 10 further includes a pre-center tube 13. When the membrane filter assembly 20 and the pre-filter element assembly 12 are located in the filter flask 11 and are sequentially arranged along the axial direction of the filter flask 11, one end, close to the membrane filter assembly 20, of the filter flask 11 is a first end 111. The raw water inlet 1111 and the purified water outlet 1115 are both positioned at the end surface of the first end 111. One end of the pre-center tube 13 is communicated with the raw water inlet 1111, and the pre-center tube 13 sequentially passes through the coiled membrane center tube 21 and the partition end cover 14 and then is inserted into the first filter cavity, so that raw water such as tap water entering from the raw water inlet 1111 enters the first filter cavity and is filtered by the pre-filter element assembly 12, and pre-filtered water obtained after being filtered by the pre-filter element assembly 12 enters the second filter cavity.

Specifically, in one embodiment, pre-filtered water filtered in the first filter chamber through the pre-filter cartridge assembly 12 may flow directly inside the filter flask 11 to the second filter chamber; alternatively, the pre-filtered water may be forced into the second filter chamber after exiting the filter flask 11.

Further, in one embodiment, as shown in fig. 6-9, the composite filter cartridge 10 further includes a guide center tube 15. The end face of the first end 111 is also provided with a pre-filter water outlet 1112, a pressurized water inlet 1113, and a concentrate water outlet 1114. The split end cover 14 is provided with a water passing jack 141, the front central tube 13 is inserted into the water passing jack 141, and the front central tube 13 and the side wall of the water passing jack 141 are arranged at intervals. The outer peripheral surface of the pre-filter element assembly 12 is spaced from the sidewall of the filter flask 11 to form a raw water gap 113. The pre-center pipe 13 communicates with the raw water gap 113 so that raw water introduced from the raw water inlet 1111 reaches the raw water gap 113 through the pre-center pipe 13 and then gradually flows inward to be filtered by the outer circumference of the pre-cartridge assembly 12, forming pre-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 rolled film central tube 21. One end of the guiding central tube 15 is communicated with the water passing jack 141, the guiding central tube 15 and the pre-central tube 13 are arranged at intervals to form a pre-filtering water gap 114, and the pre-filtering water outlet 1112 is communicated with the pre-filtering water gap 114. The prefilter water filtered by the prefilter member 12 flows from the gap between the prefilter center tube 13 and the sidewall of the water insertion hole 141 to the prefilter water gap 114, and finally flows out of the filter flask 11 from the prefilter water outlet 1112.

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

At this time, the pre-filter element assembly 12 and the side wall of the isolation assembly 30 are disposed at an interval therebetween, so as to form a raw water gap 113. The end wall of the isolation assembly 30, which is close to the raw water inlet 1111, is provided with a water passing jack 141, and one end of the pre-filter element assembly 12 abuts against the end wall of the isolation assembly 30, which is provided with the water passing jack 141. The other end of the pre-filter element assembly 12 is provided with a pre-end cover 17, and the pre-end cover 17 is provided with a pre-water hole 171. A gap is provided between the front end cover 17 and the end wall of the isolation assembly 30 so that the front water passing hole 171 communicates with the raw water gap 113. The front center pipe 13 communicates with the front water passing hole 171 through the water passing hole 141, thereby introducing 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 pre-filter element assembly 12, the obtained pre-filtered water flows along the pre-filtered water gap 114 to the pre-filtered water outlet 1112, and is discharged out of the composite filter element 10.

In yet another embodiment, as shown in fig. 7 and 8, the membrane filter assembly 20 is spaced from the filter flask 11 and/or the split 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 filtration layer 22 and the pressurized water inlet 1113, and the prefilter water flowing out of the filter flask 11 from the prefilter water outlet 1112 is pressurized outside the composite filter element 10, then enters the pressurized water gap 115 from the pressurized water inlet 1113, then enters the raw water inlet of the membrane filtration layer 22, and is further filtered in the membrane filtration layer 22. The concentrated water outlet 1114 is communicated with the concentrated water outlet of the membrane filtration layer 22, the 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 the obtained pure water further enters the rear filter element 211 for further filtering, and finally pure water is obtained and flows out of the composite filter element 10 from the pure water outlet 1115.

Specifically, as shown in fig. 7 to 9, the end of the membrane filter layer 22 of the membrane filter assembly 20 installed in the second filter cavity is provided with an adapter sleeve 18 and a water sealing member 19, the adapter sleeve 18 and the water sealing member 19 are disposed at one end, far away from the pre-filter element assembly 12, of the membrane filter layer 22, one end, far away from the pre-filter element assembly 12, of the filter flask 11 is a first end 111, the adapter sleeve 18 is connected with the end wall of the second end 112, and one end, close to the second end 112, of the coiled membrane central tube 21 is abutted against the split end cover 14. So that the pressurized water gap 115 is formed between the filter flask 11, adapter sleeve 18, water seal 19, membrane filter layer 22 and split end cap 14.

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

Further, as shown in fig. 7, 8 and 10, in one embodiment, the guiding central tube 15 is spaced from the rolled film central tube 21 to form a clean water gap 116, and the clean water gap 116 communicates with the clean water outlet 1115. In other words, the guide central tube 15 is spaced apart from the post-filter element 211 and the end cap 212 adjacent to the first end 111, forming the clean water gap 116. After the purified water filtered by the post-filter element 211 enters the purified water gap 116, the purified water flows to the purified water outlet 1115 along the purified water gap 116, and finally is 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 one embodiment, an ultrafiltration membrane 16 is disposed in the clean water gap 116, and the ultrafiltration membrane 16 is intercepted between the post-filter 211 and the clean water outlet 1115, so that the clean water filtered by the post-filter 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 flask 11, one end of the pre-filter element assembly 12 abuts against the split end cap 14, and the other end of the pre-filter element assembly 12 is provided with a pre-end cap 17. The front end cover 17 is provided with front water passing holes 171 penetrating through two end surfaces of the front end cover 17, and the front central pipe 13 is communicated with the front water passing holes 171. The end of the filter flask 11, which is close to the pre-filter element assembly 12, is a second end 112, and a gap is formed between the pre-end cover 17 and the end wall of the second end 112, so that the pre-water hole 171 is communicated with the raw water gap 113.

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

Further, in another embodiment, when the second filter cavity is surrounded by the isolation assembly 30, the first filter cavity is surrounded between the isolation assembly 30 and the filter flask 11. The front center tube 13 needs to pass through both end walls of the isolation assembly 30 to be inserted into the first filter cavity.

Specifically, in one embodiment, two ends of the pre-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 flask 11, and the pre-filter element assembly 12 and the side wall of the filter flask 11 are spaced apart to form a raw water gap 113. The water 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 through the pre-filter element assembly 12.

The two end walls of the isolation assembly 30 are respectively provided with a water passing jack 141, one end of the front central tube 13 is communicated with the front filtering water outlet 1112, the front central tube 13 is inserted into the front filter element assembly 12 through the water passing jack 141, and the coiled film central tube 21 is sleeved outside the front central tube 13.

The prefilter water filtered by the prefilter member 12 flows from the prefilter pipe 13 to the prefilter water outlet 1112, and finally is discharged from the prefilter water outlet 1112 to the filter flask 11.

Further, at this time, the membrane filtration layer 22 is spaced from the side and/or end walls of the isolation assembly 30, forming a pressurized water gap 115 in communication with the pressurized water inlet 1113. Pre-filtered water discharged from the pre-filtered water outlet 1112 may enter the pressurized water gap 115 from the pressurized water inlet 1113.

Further, in another embodiment, when the internal space enclosed by the isolation assembly 30 is the second filter cavity, the first filter cavity is enclosed between the filter flask 11 and the isolation assembly 30. It is still possible to use the pre-centre tube 13 and the guiding centre tube 15 such that the raw water flows from the pre-centre tube 13 into the first filter chamber and the pre-filtered water flows out of the filter flask 11 from the gap between the pre-centre tube 13 and the guiding centre tube 15.

Specifically, the pre-filter element assembly 12 is spaced from the sidewall of the filter flask 11 to form a raw water gap 113. One end of the pre-filter element assembly 12 abuts against the end wall of the isolation assembly 30, a pre-end cover 17 is arranged at the other end of the pre-filter element assembly 12, pre-water holes 171 penetrating through two end faces of the pre-end cover 17 are arranged on the pre-end cover 17, and a gap is arranged between the pre-end cover 17 and the end wall of the second end 112, so that the pre-water holes 171 are communicated with the raw water gap 113. The two end walls of the isolation assembly 30 are respectively provided with a water passing jack 141, one end of the front central tube 13 is communicated with the raw water inlet 1111, and the front central tube 13 passes through the water passing jack 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 coiled film 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 guiding central tube 15 is communicated with the water passing jack 141, and one end of the pre-filtering water gap 114 far away from the water passing jack 141 is communicated with the pre-filtering 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 that communicates with the pressurized water inlet 1113.

Further, in another embodiment, a water purifier system 40 is provided that includes the composite filter element 10 described above. By adopting the composite filter element 10 according to any one of the embodiments, the integration level of the water purifier system 40 is improved, and the manufacturing cost of the water purifier system 40 is effectively controlled while meeting the filtering requirement.

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

Further, in one embodiment, as shown in fig. 15 and 16, the purified water outlet 1115 is provided with a purified water passage 42, the purified water passage 42 is used for communicating with the faucet 45, the purified 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 sensing member 421 controls the start and stop of the pressurized water pump 411 by sensing the pressure on the purified water path 42. When the tap 45 is closed, the pressure in the water purifying passage 42 increases, and when the pressure sensor 421 detects that the pressure in the water purifying passage 42 increases to a predetermined high pressure value, the pressurized water pump 411 is controlled to stop operating, thereby reducing the pressure in the water purifying system 40. When the tap 45 is turned on, the pressure in the water purifying passage 42 is reduced, and when the pressure sensing member 421 detects that the pressure in the water purifying passage 42 is reduced to a predetermined low pressure value, the pressurized water pump 411 is controlled to be activated. Thereby constantly maintaining the water supply pressure stable and improving the stability of the water supply flow.

The electrical connection between the pressure sensing member 421 and the pressurized water pump 411 may be indirectly and electrically connected through a control system, and the pressure sensing member 421 and the pressurized water pump 411 are electrically connected with the control system. In other words, after the pressure sensing member 421 senses the pressure on the water purifying passage 42, the control system controls the pressurized water pump 411 to be turned on or off according to the sensed pressure.

Further, as shown in fig. 15 and 16, in one embodiment, a first electromagnetic valve 412 is disposed on the pressurization path 41, the first electromagnetic valve 412 is located between the pressurization water pump 411 and the pre-filtration water outlet 1112, and the first electromagnetic valve 412 is electrically connected to the pressure sensing element 421.

When the pressure sensing member 421 senses that the pressure display faucet 45 is turned off, the first electromagnetic valve 412 electrically connected to the pressure sensing member 421 is turned off, so that the pressurization passage 41 is blocked, the water at the pre-filtration water outlet 1112 cannot continue to flow along the pressurization passage 41, and the composite filter element 10 stops filtration, thereby protecting the membrane filtration layer 22 and the coiled central tube 21. When the pressure sensing member 421 senses that the tap 45 is opened, the first electromagnetic valve 412 and the pressurized water pump 411 are opened, and the composite filter 10 is put into a filtering state.

Further, in one embodiment, as shown in fig. 16, the water purifier system 40 further includes an additional passage 43, and the additional passage 43 is communicated between the pressurization passage 41 and the faucet 45. The position of the pressurizing passage 41 for communicating with the additional passage 43 is located between the first solenoid valve 412 and the pre-filter water outlet 1112.

When the user's requirement for water quality is low, the pre-filtered water filtered by the pre-filter assembly 12 can meet the requirement, the additional passage 43 can guide the pre-filtered water on the pressurized passage 41 to the faucet 45 for the user. It should be noted that, as shown in fig. 2, when the user has different demands on the water quality, the faucet 45 is provided with at least two switches for controlling the water flows out of different water qualities. When the corresponding switch is turned on, water in the corresponding passage flows out of the faucet 45.

When the quality of the pre-filtered water can meet the user's demand, the switch on the faucet 45 for communicating with the purified water passage 42 is turned off. When the pressure sensing member 421 senses that the pressure increases to a predetermined high pressure value, the pressurized water pump 411 and the first solenoid valve 412 are both closed, and the pre-filter assembly 12 is still capable of filtering, and the pre-filtered water obtained by filtering at this time flows to the faucet 45 through the additional passage 43 for the user.

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

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

In the description of the present invention, it should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" 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 are used herein for illustrative purposes only and are not meant to be the only embodiment.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The composite filter element is characterized by comprising a filter flask, wherein an isolation assembly is arranged in the filter flask and is used for dividing a space in the filter flask into a first filter cavity and a second filter cavity which are mutually independent, a front filter element assembly is arranged in the first filter cavity, the filter flask is provided with a raw water inlet and a front filter water outlet which are both communicated with the first filter cavity, front filter water obtained after raw water entering from the raw water inlet is filtered by the front filter element assembly flows to the front filter water outlet, a coiled film central tube and a membrane filter layer are arranged in the second filter cavity, the coiled film central tube comprises a rear filter element and end covers arranged at two ends of the rear filter element, the membrane filter layer is sleeved on the coiled film central tube, a guide groove is arranged at the position of the outer peripheral surface of the end cover, liquid in the guide groove can flow into the rear filter element, a pressurized water gap is formed between the membrane filter layer and the side wall of the second filter cavity at intervals, and the pressurized water gap is communicated with the raw water inlet of the filter layer, and the pressurized water gap is communicated with the pressurized water inlet of the filter flask;

The composite filter element further comprises a preposed central tube, the raw water inlet is positioned on the end wall of the first end of the filter flask, the first filter cavity and the second filter cavity are sequentially distributed in the axial direction of the filter flask, the part of the filter flask used for forming the first filter cavity is a second end, a raw water gap is formed between the preposed filter element assembly and the side wall of the first filter cavity at intervals, one end of the preposed central tube is communicated with the raw water inlet, the preposed central tube penetrates through the second filter cavity and then is inserted into the first filter cavity, and one end of the preposed central tube inserted into the first filter cavity is communicated with the raw water gap;

The composite filter element comprises an isolation assembly, and is characterized in that a water passing jack is arranged on the end wall of the isolation assembly, which is close to a raw water inlet, a guide central tube is further arranged on the end wall of the first end of the filter flask, a front filter water outlet is arranged on the end wall of the first end of the filter flask, one end of the front filter element assembly is abutted against the end wall of the water passing jack, a front end cover is arranged on the other end of the front filter element assembly, a front water passing hole is arranged on the front end cover, a gap is arranged between the front end cover and the end wall of the isolation assembly, so that the front water passing hole is communicated with the raw water gap, the front central tube is communicated with the front water passing hole, the front central tube is arranged at a distance from the side wall of the water passing jack, the guide central tube is sleeved outside the front central tube, a front filter water gap is formed by the guide central tube at a distance between the guide central tube and the front central tube, the front filter water outlet is communicated with the front water passing jack, and the front filter water outlet is far away from the front water outlet; the end wall of the first end is provided with a concentrated water outlet and a purified water outlet, the concentrated water outlet of the membrane filter layer is communicated with the concentrated water outlet, a guide central pipe and a coiled membrane central pipe are arranged at intervals to form a purified water gap, and the purified water gap is communicated with the purified water outlet.

2. The composite filter element of claim 1, wherein the isolation assembly comprises a cartridge body and a cartridge cover, the cartridge cover being sealingly connected to the opening of the cartridge body.

3. The composite filter element of claim 2, wherein the cartridge is welded to the cap, or wherein an annular mounting groove is provided in the cap opposite the open end of the cartridge, wherein the cartridge is inserted into the annular mounting groove, and wherein a seal is provided between the cartridge and a sidewall of the annular mounting groove.

4. The composite filter element of claim 1, wherein the sidewall of the isolation assembly is spaced from the sidewall of the filter flask to form a water gap, a first deflector rib is disposed outside the sidewall of the isolation assembly, and the first deflector rib is disposed between the sidewall of the filter flask and the sidewall of the isolation assembly.

5. The composite filter element of claim 1, wherein when the interior space enclosed by the isolation assembly is the first filter cavity, the filter flask and the isolation assembly enclose the second filter cavity therebetween, the pre-center tube is inserted into the first filter cavity after passing through the water passing jack.

6. The composite filter element of claim 1, wherein an ultrafiltration membrane is disposed in the clean water gap, the ultrafiltration membrane being intercepted between the post-filter element and the clean water outlet.

7. The composite filter element of claim 1, wherein 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%.

8. A composite filter element according to any one of claims 1 to 4, wherein the portion of the outer peripheral surface of the end cap covered by the membrane filter layer includes a water seal region where the membrane filter layer is connected to the end cap, and the flow guide groove is located on a side of the water seal region adjacent to the rear filter element.

9. A water purifier system comprising the composite filter element of any one of claims 1 to 8, wherein a pressurized passageway is provided between the pre-filter water outlet and the pressurized water inlet, and a pressurized water pump is provided on the pressurized passageway.