CN114394687A

CN114394687A - Water purification system

Info

Publication number: CN114394687A
Application number: CN202210080922.2A
Authority: CN
Inventors: 陈群; 杨亚鹏; 符之之; 张量; 李友铃; 曾浈
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-04-26

Abstract

The invention provides a water purification system, which comprises: compound filter element group spare, preliminary treatment filter core and aftertreatment filter core, compound filter element group spare includes: raw water inlet, produce the water export, the waste water export, first filter core and second filter core, first filter core includes first hollow fiber filtration membrane silk, the second filter core includes second hollow fiber filtration membrane silk, the hydroenergy that raw water inlet got into can filter through first filter core, and get into the inside of first hollow fiber filtration membrane silk and finally derive through producing the water export when filtering, the hydroenergy that does not get into the inside of first filter core can filter through the second filter core, and get into the inside of second hollow fiber filtration membrane silk and finally derive through producing the water export when filtering, the hydroenergy that does not get into the inside of second filter core can communicate and derive with the waste water export. By the aid of the water purifier, filtering effect is guaranteed, recovery efficiency is improved, and the overall volume of the water purifier is reduced.

Description

Water purification system

Technical Field

The invention belongs to the technical field of water purification, and particularly relates to a water purification system.

Background

With the increasing demand of the nation for good life, the demand of the nation for drinking water quality is higher and higher. The household drinking water is mainly supplied by municipal pipe network in a centralized way, and the water pollution is mainly caused by water supply pipe network and incomplete early municipal treatment.

The filter element used by the current household water purifier is mainly divided into an ultrafiltration filter element, a nanofiltration filter element and a reverse osmosis filter element according to the filtration precision. The nanofiltration filter core is more and more popular with consumers in the market due to the characteristics of low operation pressure, large pure water flux, low operation cost and the like. At present, the nanofiltration membrane used in the field of water treatment mostly adopts a pressure filtration mode, and the nanofiltration membrane has the following forms: the spiral-wound nanofiltration membrane, the hollow fiber nanofiltration membrane, the plate-frame nanofiltration membrane and the like are used in the actual use process, a plurality of nanofiltration membrane components are required to be connected in series and in parallel for improving the treatment capacity, the occupied area is large, and the method is not suitable for the use scene of the household water purifier.

At present, domestic water purifiers are popularized, however, the water purifiers are always accompanied with the generation of waste water when generating purified water, most of the waste water is directly discharged and wasted, and 1L of waste water is lost when generating 1L of waste water by taking the pure waste ratio as 1:1 as an example. Therefore, although the water purifier improves the quality of drinking water, the water purifier also indirectly wastes water resources.

Because the traditional filter element component in the prior art has the technical problems of low recovery efficiency, large wastewater discharge, large whole machine volume and the like, the invention researches and designs a water purification system.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect of low wastewater recovery efficiency of the traditional filter element component in the prior art, thereby providing a water purification system.

The invention provides a water purification system, which comprises: compound filter element group spare, preliminary treatment filter core and aftertreatment filter core, compound filter element group spare includes: the water-saving filter comprises a raw water inlet, a water production outlet, a wastewater outlet, a first filter element and a second filter element, wherein the first filter element comprises a first hollow fiber filtering membrane wire, the second filter element comprises a second hollow fiber filtering membrane wire, the water entering from the raw water inlet can pass through the first filter element for filtering, enters the inside of the first hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet, the water which does not enter the inside of the first filter element can pass through the second filter element for filtering, enters the inside of the second hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet, and the water which does not enter the inside of the second filter element can be communicated with the wastewater outlet and is led out;

the water outlet of the pretreatment filter element can be communicated with the raw water inlet through a first pipeline, and the water inlet of the post-treatment filter element can be communicated with the water outlet through a second pipeline.

In some embodiments, the cartridge housing is a cylindrical structure, the first hollow fiber filtration membrane filaments are in a straight tube section structure with straight edges extending in an axial direction of the cartridge housing, and the second hollow fiber filtration membrane filaments are in a straight tube section structure with straight edges extending in an axial direction of the cartridge housing; the first hollow fiber filtering membrane filaments are multiple and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell; the second hollow fiber filtering membrane filaments are multiple and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell.

The raw water inlet, the produced water outlet and the wastewater outlet are all arranged at the axial first end of the filter element shell; or, the raw water inlet sets up the axial first end of filter core shell, produce the water export with the waste water export all sets up the axial second end of filter core shell.

In some embodiments, the filter element further comprises a first section filter element membrane shell and a second section filter element membrane shell, wherein the first section filter element membrane shell and the second section filter element membrane shell are both arranged in the filter element shell, the second section filter element membrane shell is arranged at one axial end of the first section filter element membrane shell, the radial inner side of the second section filter element membrane shell is provided with the second filter element, and the radial inner side of the first section filter element membrane shell is provided with the first filter element.

In some embodiments, one side of the second section of the filter element membrane shell facing the filter element shell is provided with a first channel, the radial inner side of the filter element shell is formed into a first cavity, the first section of the filter element membrane shell and the second section of the filter element membrane shell are both positioned in the first cavity, the radial inner side of the first section of the filter element membrane shell is formed into a second cavity, the first filter element is positioned in the second cavity, the raw water inlet is communicated with one end of the first channel, the other end of the first channel is communicated with the first cavity, the first cavity is communicated with the second cavity through a first raw water outlet formed in the first section of the filter element membrane shell so as to guide water into the first filter element, and the first raw water outlet is a radial through hole penetrating through the inner wall and the outer wall of the first section of the filter element membrane shell along the radial direction.

In some embodiments, the second section of the filter element membrane shell forms a third cavity inside, the second filter element is positioned in the third cavity, the first section of the filter element membrane shell is axially provided with at least one first section of waste water outlet penetrating through the inner wall and the outer wall of the first section of the filter element membrane shell, and water in the second cavity can enter the third cavity through the first section of the waste water outlet.

In some embodiments, still include first section filter core end cover, the axial one end of first filter core is connected and is provided with first bonding portion, the axial other end is connected and is provided with the second bonding portion, first bonding portion with the periphery of second bonding portion is all overlapped and is established first section filter core membrane shell, the periphery of first section filter core membrane shell with sealing connection between first section filter core end cover, first bonding portion with first section filter core end cover forms on the axial direction the second passageway, through water after the first filter core filters gets into in the second passageway.

In some embodiments, a second section of filter element end cover is further arranged at one axial end of the second section of filter element membrane shell, a third channel is further arranged between the second section of filter element membrane shell and the second section of filter element end cover, water filtered by the second filter element enters the third channel, and the second channel is communicated with the third channel and then can discharge the filtered water through the water production outlet.

In some embodiments, a portion of the third cavity, which is located on the radial inner side of the second filter element, is provided with a communication pipe, one end of the communication pipe is communicated with the water production outlet, and the other end of the communication pipe is communicated with the second channel, so that water entering the first filter element can be discharged through the communication pipe via the water production outlet.

In some embodiments, the axial one end of second filter core is connected and is provided with third bonding portion, the connection of the axial other end sets up the fourth bonding portion, the periphery of third bonding portion with the periphery of fourth bonding portion is all overlapped and is established second section filter core membrane shell, the third bonding portion with the inner periphery of fourth bonding portion is all worn to establish communicating pipe, process the inside hydroenergy that filters out of second filter core can pass through get into behind the third bonding portion in the third passageway.

In some embodiments, the water purifier further comprises a third filter element end cover, the filter element end cover is sleeved on the periphery of the second section of filter element membrane shell, a second section of wastewater outlet is formed in the second section of filter element membrane shell in a penetrating manner along the axial direction, a fourth channel is formed between the filter element end cover and the second section of filter element end cover, one end of the fourth channel is communicated with the wastewater outlet, and the other end of the fourth channel can be communicated with the third cavity, so that water which does not enter the second filter element can enter the fourth channel through the second section of wastewater outlet and then is discharged through the wastewater outlet; the third filter element end cover and the filter element membrane shell form the first channel at intervals in the axial direction.

In some embodiments, the second segment of the filter cartridge membrane shell is in sealing connection with the second segment of the filter cartridge end cap at the periphery thereof; and/or the waste water outlet is located radially outside the water production outlet.

In some embodiments, still include first section filter core membrane shell and second section filter core membrane shell, first section filter core membrane shell with second section filter core membrane shell all set up in the filter core shell, second section filter core membrane shell set up in the radial inside of first section filter core membrane shell, the second filter core is located the radial inboard of first filter core, the inside of second section filter core membrane shell sets up the second filter core, first filter core is located the periphery of second section filter core membrane shell, first section filter core membrane shell is located axial one side of first filter core.

In some embodiments, the raw water inlet is disposed at the first axial end of the filter element housing, a first channel is disposed between the first filter element membrane shell and the filter element housing, a first cavity is formed between the second filter element membrane shell and the filter element housing, the first filter element is located in the first cavity, the raw water inlet is communicated with one end of the first channel, and the other end of the first channel is communicated with the first cavity so as to filter water introduced into the first filter element.

In some embodiments, the second section of the filter cartridge membrane shell is internally provided with a second cavity, the second filter cartridge is positioned in the second cavity, the second section of the filter cartridge membrane shell is provided with at least one first section of waste water outlet penetrating through the inner wall and the outer wall of the second section of the filter cartridge membrane shell, and water in the first cavity can enter the second cavity through the first section of waste water outlet.

In some embodiments, a second channel is further provided between the axial end of the first filter element and the first section of filter element membrane shell, water filtered by the first filter element enters the second channel, the axial first end of the filter element shell is provided with the water production outlet, a third channel is further provided between the axial end of the second section of filter element membrane shell and the water production outlet, water filtered by the second filter element enters the third channel, and the second channel and the third channel can discharge the filtered water through the water production outlet after being communicated.

In some embodiments, the first end of the axial direction of the filter element shell is further provided with the wastewater outlet, the first end of the axial direction of the second section of the filter element shell is further communicated with a communicating pipe, one end of the communicating pipe is communicated with the wastewater outlet, the other end of the communicating pipe is communicated with the part, located on the radial inner side, of the second filter element in the second cavity, and water which does not enter the second filter element can be discharged from the wastewater outlet through the communicating pipe.

In some embodiments, the axial one end of the first filter element is connected and is provided with a first bonding portion, the axial other end is further connected and is provided with a second bonding portion, the first bonding portion and the periphery cover of the second bonding portion are provided with a first section of filter element end cover, the periphery of the first section of filter element end cover and the first section of filter element membrane shell are connected in a sealing mode, and the first bonding portion and the first section of filter element membrane shell are formed in the axial direction of the second channel.

In some embodiments, the connection of the axial one end of second filter core is provided with the third portion of bonding, the connection of the axial other end is provided with the fourth portion of bonding, the third portion of bonding with the outer peripheral cover of fourth portion of bonding is established second section filter core membrane shell, wear to establish in the inner week of third portion of bonding communicating pipe, process the inside hydroenergy that crosses of second filter core can pass through behind the third portion of bonding get into in the third passageway, do not get into the inside water of second filter core gets into in the communicating pipe.

In some embodiments, a first protrusion is formed on the filter element shell at a position between the produced water outlet and the raw water inlet and protrudes towards the first section of filter element membrane shell, a second protrusion protrudes towards the filter element shell along the axial direction on the first section of filter element membrane shell, and the first protrusion is connected with the second protrusion and a first sealing element is arranged between the first protrusion and the second protrusion;

the filter element shell is provided with a waste water outlet, the periphery of the waste water outlet faces the second section of filter element membrane shell is protruded to form a third protrusion, the third protrusion forms a sleeve and is sleeved on the periphery of the communicating pipe, and the communicating pipe is provided with a second sealing element between the third protrusion and the communicating pipe.

In some embodiments, the first hollow fiber filtration membrane filaments are hollow fiber nanofiltration membrane filaments or hollow reverse osmosis membrane filaments.

In some embodiments, the device further comprises a third pipeline, a fourth pipeline and a fifth pipeline, as well as a pump and a waste water valve, wherein one end of the third pipeline is communicated with the inlet of the pretreatment filter element to introduce raw water, one end of the fourth pipeline is communicated with the waste water outlet to lead out waste water or concentrated water, one end of the fifth pipeline is communicated with the outlet of the post-treatment filter element to lead out pure water, and the waste water valve is arranged on the fourth pipeline.

The water purification system provided by the invention has the following beneficial effects:

according to the invention, the first filter element and the second filter element are arranged, the second filter element comprises a second hollow fiber filtering membrane wire, the second filter element is positioned at one axial end of the first filter element or the second filter element is positioned at the radial inner side of the first filter element, water entering from the raw water inlet can be filtered by the first filter element, enters the inside of the first hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet, the fiber filtering membrane wires are radially arranged together, the condition of gluing on the membrane does not exist, and the radial filling density can be designed according to specific application, so that the effective membrane area is improved; compared with the traditional filter element, the filter element has the problems of small effective membrane area and small water production flux, the hollow fiber nanofiltration or reverse osmosis technology adopted in the technical scheme 1) the invention effectively forms a one-stage and two-stage water purification system, the hollow fiber nanofiltration/reverse osmosis membrane filter element in core water purification adopts a one-stage and two-stage mode, and the wastewater after the water is filtered by the first stage filter element is continuously filtered by the second stage filter element, so that the filtration effect is ensured, the recovery efficiency is improved, and the whole volume of the water purifier is reduced; 2) the filter has high filtering precision, and compared with the traditional ultrafiltration filter core technology, the technical scheme has good separation effect on divalent and high-valent salt and small molecular organic matters, can improve the filtering precision and reduce scaling risk; 3) the area of the filter element membrane is effectively increased, the hollow fiber nanofiltration or reverse osmosis technology adopted by the technical scheme can effectively utilize space, increase the membrane area and improve the water quality purification effect; 4) the operation pressure is small, the operation cost is low, the hollow fiber nanofiltration technology adopted by the technical scheme is that under the action of pressure difference, salt and small molecular substances permeate the nanofiltration membrane, and the operation pressure is lower than that of a reverse osmosis filter element; .

Drawings

FIG. 1 is a schematic view of a water purification system of the present invention, including an axial first stage two stage cartridge, in the production of water;

FIG. 2 is a schematic view of a water purification system of the present invention including an axial one-stage two-stage cartridge-during flushing;

FIG. 3 is a schematic diagram of a water purification system of the present invention, including a radial primary two-stage cartridge, for water production;

FIG. 4 is a cross-sectional structural view of the composite filter element assembly of FIG. 1;

FIG. 5 is a cross-sectional structural view of the composite filter element assembly of FIG. 3.

The reference numbers in the figures denote:

100. a raw water inlet; 200. a water production outlet; 300. a waste water outlet; 400. a first pipeline; 500. a second pipeline; 600. a third pipeline; 700. a fourth pipeline; 800. a fifth pipeline; 1. a first filter element; 2. a second filter element; 3. a filter element housing; 4. a first section of filter element membrane shell; 41. a first raw water outlet; 5. a second section of filter element membrane shell; 51. a first stage wastewater outlet; 52. a second section wastewater outlet; 6. a first channel; 7. a first cavity; 8. a second cavity; 9. a third cavity; 10. a second channel; 11. a third channel; 12. a communicating pipe; 131. a first bonding portion; 132. a second bonding portion; 13a, a first section of filter element end cover; 13b, a second section of filter element end cover; 15. a third filter element end cap; 16a, a third bonding portion; 16b, a fourth bonding portion; 17. a fourth channel; 18. a first seal member; 20. pretreating a filter element; 21. post-treatment of the filter element; 22. a pump; 23. a waste water valve.

Detailed Description

As shown in fig. 1 to 5, the present invention provides a water purification system, which includes:

the water purifier comprises a composite filter element assembly, a pretreatment filter element 20 and a post-treatment filter element 21, wherein the composite filter element assembly comprises a raw water inlet 100, a water production outlet 200, a wastewater outlet 300, a first filter element 1 and a second filter element 2, the first filter element 1 comprises a first hollow fiber filtering membrane wire, the second filter element 2 comprises a second hollow fiber filtering membrane wire, water entering from the raw water inlet 100 can be filtered by the first filter element 1, enters the first hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet 200, water not entering the first filter element 1 can be filtered by the second filter element 2, enters the second hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet 200, and water not entering the second filter element 2 can be communicated with and led out from the wastewater outlet 300;

the outlet water of the pretreatment filter element 20 can be communicated with the raw water inlet 100 through a first pipeline 400, and the inlet water of the post-treatment filter element 21 can be communicated with the produced water outlet 200 through a second pipeline 500.

According to the invention, the first filter element and the second component are arranged, the second filter element comprises a second hollow fiber filtering membrane wire, the second filter element is positioned at one axial end of the first filter element, water entering from the raw water inlet can be filtered by the first filter element, enters the first hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet, water not entering the first filter element 1 can be filtered by the second filter element 2, enters the second hollow fiber filtering membrane wire during filtering and is finally led out through the water production outlet 200, and the fiber filtering membrane wires are radially arranged together, so that the condition of gluing on the membrane does not exist, and the density of radial filling can be designed according to specific application, so that the effective area is improved; compared with the traditional filter element, the filter element has the problems of small effective membrane area and small water production flux, the hollow fiber nanofiltration or reverse osmosis technology adopted in the technical scheme 1) the invention effectively forms a one-stage and two-stage water purification system, the hollow fiber nanofiltration/reverse osmosis membrane filter element in core water purification adopts a one-stage and two-stage mode, and the wastewater after the water is filtered by the first stage filter element is continuously filtered by the second stage filter element, so that the filtration effect is ensured, the recovery efficiency is improved, and the whole volume of the water purifier is reduced; 2) the filter has high filtering precision, and compared with the traditional ultrafiltration filter core technology, the technical scheme has good separation effect on divalent and high-valent salt and small molecular organic matters, can improve the filtering precision and reduce scaling risk; 3) the area of the filter element membrane is effectively increased, the hollow fiber nanofiltration or reverse osmosis technology adopted by the technical scheme can effectively utilize space, increase the membrane area and improve the water quality purification effect; 4) the operation pressure is small, the operation cost is low, the hollow fiber nanofiltration technology adopted by the technical scheme is that under the action of pressure difference, salt and small molecular substances permeate the nanofiltration membrane, and the operation pressure is lower than that of a reverse osmosis filter element; 5) convenient installation, the membrane core subassembly of utilizing this technical scheme production, its water inlet, delivery port and dense exhalant outlet are located same end, can realize convenient installation, promote user experience.

Aiming at the problems that the traditional filter element assembly cannot simultaneously meet the requirements of high filtering precision, low operation cost, large water production flux and convenience in installation, the invention provides a technical scheme of the filter element assembly with high filtering precision and large water production flux, which can effectively solve the problem of convenience in installation and specifically comprises the following steps:

1. the traditional ultrafiltration filter core has low filtration precision and is easy to scale;

2. the traditional reverse osmosis filter element has high operation pressure and small effective membrane area;

3. the traditional nanofiltration filter core has low space utilization rate and low water production flux;

4. the water inlet, the water production port and the concentrated water discharge port of the conventional hollow fiber nanofiltration membrane core are on different surfaces, so that the mounting convenience is insufficient, and the user experience is poor.

The solution to these several problems can improve the flux of produced water, improve the utilization ratio of the membrane surface, improve the water quality purification effect, and avoid the situation of difficult installation.

According to the invention, the first-stage two-section filtration (RO filter element) is realized by the hollow membrane wire, and the recovery rate is improved, and the hollow membrane wire plus the first-stage two-section structure solves the problem that the recovery rate of the produced water can be improved while the accuracy is improved.

Different from the traditional filter element assembly, the invention provides a hollow fiber nanofiltration or reverse osmosis (which is arranged in the upper position to a hollow fiber filtration membrane wire and comprises nanofiltration and reverse osmosis) one-stage two-section type composite filter element assembly which is radially arranged, has large effective membrane area, high filtration precision and large water production flux, can meet the requirement of a user on water purification, can solve the problem of complex core replacement operation, and improves the treatment efficiency of the filter element. Different from the traditional filter element assembly, the invention utilizes hollow fiber nanofiltration or reverse osmosis membrane filaments to form a two-section type filter element structure, thereby improving the membrane surface utilization rate, and simplifying the installation operation of the filter element by designing the water inlet, the water outlet and the concentrated water outlet at the same end. The hollow fiber nano-filter or reverse osmosis is a hollow filamentous structure, filtered water can enter the hollow interior, and water which cannot enter the hollow interior is concentrated water or waste water containing high impurities.

In some embodiments, the cartridge housing 3 is a cylindrical structure, the first hollow fiber filtration membrane filaments are in a straight tube section structure with straight edges extending in the axial direction of the cartridge housing 3, and the second hollow fiber filtration membrane filaments are in a straight tube section structure with straight edges extending in the axial direction of the cartridge housing 3; the first hollow fiber filtering membrane filaments are multiple and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell 3; the second hollow fiber filtering membrane filaments are a plurality of and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell 3. The filter element shell is a preferred structure form of the filter element shell, and the first hollow fiber filtering membrane wire and the second hollow fiber filtering membrane wire extend along the axial direction, and the first hollow fiber filtering membrane wire and the second hollow fiber filtering membrane wire are arranged at intervals, so that the contact area with water can be effectively increased in the space direction, the membrane area is increased, and the filtering effect is improved.

In some embodiments, the filter further comprises a filter element housing 3, and the raw water inlet 100, the produced water outlet 200 and the waste water outlet 300 are all arranged at a first axial end of the filter element housing 3; or, the raw water inlet 100 is disposed at an axial first end of the filter element housing 3, and the produced water outlet 200 and the waste water outlet 300 are disposed at an axial second end of the filter element housing 3. The filter element structure is an optimal structure form of the filter element structure, namely, the raw water inlet, the produced water outlet and the waste water outlet can be arranged at the same end, and the raw water inlet and the produced water waste water outlet can be arranged at two axial ends, so that the effect of effectively purifying water can be realized.

In some embodiments, the filter further comprises a first section filter element membrane shell 4 and a second section filter element membrane shell 5, wherein the first section filter element membrane shell 4 and the second section filter element membrane shell 5 are both arranged in the filter element shell 3, the second section filter element membrane shell 5 is arranged at one axial end of the first section filter element membrane shell 4, the radial inner side of the second section filter element membrane shell 5 is provided with the second filter element 2, and the radial inner side of the first section filter element membrane shell 4 is provided with the first filter element 1. The composite filter element is a preferred structural form, the shape of the shell can be limited through the filter element shell, a first section of filter element membrane shell and a second section of filter element membrane shell are arranged in the shell, the second section of filter element membrane shell is used for limiting a second filter element, the first filter element is positioned above the second section of filter element membrane shell in the axial direction, so that the first filter element and the second filter element are arranged up and down in the axial direction, water is filtered by the first filter element above the shaft and is sent out from a water production outlet, and water which does not enter the first filter element reaches the second filter element for filtering, so that a one-stage two-section filtering structural form is formed, and the utilization efficiency and the recovery efficiency of waste water are improved.

In some embodiments, the cartridge housing 3 has a first passage 6 therein, the interior of the cartridge housing 3 is formed as a first cavity 7, the first section of filter element membrane shell 4 and the second section of filter element membrane shell 5 are both positioned in the first cavity 7, the radial inner side of the first section of the filter element membrane shell 4 forms a second cavity 8, the first filter element 1 is positioned in the second cavity 8, the raw water inlet 100 is communicated with one end of the first channel 6, the other end of the first channel 6 is communicated with the first cavity 7, the first cavity 7 is communicated with the second cavity 8 through a first raw water outlet 41 arranged on the first section of the filter element membrane shell 4, so as to lead water into the first filter element 1 for filtering, and the first raw water outlet 41 is a radial through hole which radially penetrates through the inner wall and the outer wall of the first section of filter element membrane shell 4. The water purifier can also guide raw water into the first filter element for filtering through the first cavity through the first channel, and pure water enters the hollow interior of the first filter element, and wastewater which cannot enter the hollow interior of the first filter element is wastewater which further enters the second filter element for filtering, so that the wastewater utilization rate is improved.

In some embodiments, the interior of the second section of the filter cartridge membrane shell 5 forms a third cavity 9, the second filter cartridge 2 is located in the third cavity 9, the first section of the filter cartridge membrane shell 4 is axially formed with at least one first section waste water outlet 51 penetrating through the inner wall and the outer wall thereof, and water in the second cavity 8 can enter the third cavity 9 through the first section waste water outlet 51. The third cavity in the second section of filter element membrane shell can guide the wastewater filtered from the first filter element into the third cavity through the first section of wastewater outlet, and then the wastewater is filtered at the second filter element, so that the utilization efficiency of the wastewater is improved.

In some embodiments, the filter cartridge further comprises a first section of filter cartridge end cover 13a, the axial end of the first filter cartridge 1 is connected to be provided with a first bonding portion 131, the axial other end is connected to be provided with a second bonding portion 132, the first bonding portion 131 and the outer periphery of the second bonding portion 132 are sleeved on the first section of filter cartridge membrane shell 4, the outer periphery of the first section of filter cartridge membrane shell 4 is connected to the first section of filter cartridge end cover 13a in a sealing manner, the first bonding portion 131 and the first section of filter cartridge end cover 13a are formed in the axial direction of the second channel 10, and water filtered by the first filter cartridge 1 enters the second channel 10. The pure water filtered out from the first filter element can be guided into the second channel through the second channel between the axial end of the first filter element and the end cover of the first section of the filter element, and then is guided out through the water production outlet. In some embodiments, a first bonding portion 131 is connected to one axial end of the first filter element 1, a first filter element membrane shell 4 is sleeved on the outer periphery of the first bonding portion 131, the outer periphery of the first filter element membrane shell 4 is connected to the first filter element end cover 13a in a sealing manner, and the first bonding portion 131 and the first filter element end cover 13a form the second channel 10 in the axial direction. The first filter element end cover is positioned below the first section of filter element membrane shell in the axial direction, the first section of filter element end cover is connected with the first section of filter element membrane shell in a sealing mode, and the sealing ring is arranged, so that the first filter element is fixed at one end of the first filter element in the axial direction, and water can pass through the first bonding part.

In some embodiments, a second-stage filter element end cap 13b is further disposed at one axial end of the second-stage filter element membrane shell 5, a third channel 11 is further disposed between the second-stage filter element membrane shell 5 and the second-stage filter element end cap 13b, water filtered by the second filter element 2 enters the third channel 11, and the filtered water can be discharged through the water production outlet 200 after the second channel 10 is communicated with the third channel 11. According to the invention, through the arrangement of the second section of filter element end cover, a third channel is formed between the second section of filter element end cover and the second section of filter element membrane shell, and the water filtered by the second filter element can be led out to a water producing port through the third channel, so that the effect of leading out the pure water filtered by the second filter element is realized.

In some embodiments, a communication pipe 12 is disposed in a portion of the third cavity 9, which is located radially inside the second filter element 2, one end of the communication pipe 12 is communicated with the produced water outlet 200, and the other end is communicated with the second channel 10, so that water entering the interior of the first filter element 1 can be discharged through the produced water outlet 200 through the communication pipe 12.

The filter element shell is provided with a water outlet in the axial direction, and the communicating pipe is arranged in the second section of filter element membrane shell and is positioned on the radial inner side of the second filter element, so that the water in the radial inner side of the second filter element in the second cavity can be led out to the water outlet through the communicating pipe, and the filtered pure water can be effectively led out.

In some embodiments, the axial end of the second filter element 2 is provided with a third bonding portion 16a in a connecting manner, the axial end of the second filter element is provided with a fourth bonding portion 16b in a connecting manner, the outer periphery of the third bonding portion 16a and the outer periphery of the fourth bonding portion 16b are both sleeved with the second section filter element membrane shell 5, the communication pipe 12 is penetrated by the outer periphery of the third bonding portion 16a and the inner periphery of the fourth bonding portion 16b, and water filtered out from the inside of the second filter element 2 can pass through the third bonding portion 16a and then enter the third channel 11. The axial end of the second filter element can be fixed through the third bonding part arranged at the axial end of the second filter element, the communicating pipe penetrates through the third bonding part, and pure water filtered out from the interior of the second filter element can penetrate through the third bonding part to enter the third channel and be discharged.

In some embodiments, the water purifier further comprises a third filter element end cover 15, the third filter element end cover 15 is sleeved on the periphery of the second filter element membrane shell 5, a second section of wastewater outlet 52 is formed in the second filter element membrane shell 5 in an axially penetrating manner, a fourth channel 17 is formed between the third filter element end cover 15 and the second section of filter element end cover 13b, one end of the fourth channel 17 is communicated with the wastewater outlet 300, and the other end of the fourth channel can be communicated with the third cavity 9, so that water which does not enter the second filter element 2 can enter the fourth channel 17 through the second section of wastewater outlet 52 and then be discharged through the wastewater outlet 300; the third cartridge end cap 15 is axially spaced from the cartridge housing 3 to define the first passage 6. According to the invention, a fourth channel can be formed between the third filter element end cover and the second section of filter element membrane shell, and the fourth channel can be communicated with the third cavity through the second section of wastewater outlet, so that the water of the wastewater which is filtered out without entering the second filter element in the third cavity is guided into the fourth channel and guided out to the wastewater outlet 300.

In some embodiments, the outer periphery of the second segment cartridge membrane shell 5 is in sealed connection (via first seal member 18) with the second segment cartridge end cap 13b, and the waste water outlet is radially outward of the product water outlet.

In some embodiments, the waste water outlet 300 is located radially outward of the water production outlet 200; and/or the first hollow fiber filtration membrane filaments are hollow fiber nanofiltration membrane filaments or hollow reverse osmosis membrane filaments.

In some embodiments, still include first section filter core membrane shell 4 and second section filter core membrane shell 5, first section filter core membrane shell 4 with second section filter core membrane shell 5 all set up in filter core shell 3, second section filter core membrane shell 5 set up in first section filter core membrane shell 4's radial inside, second filter core 2 is located first filter core 1's radial inboard, just the inside setting of second section filter core membrane shell 5 second filter core 2, first filter core 1 is located second section filter core membrane shell 5's periphery, first section filter core membrane shell 4 is located first filter core 1's axial one side. The composite filter element is a preferred structural form, the shape of the shell can be defined through the filter element shell, a first section of filter element membrane shell and a second section of filter element membrane shell are arranged in the shell, the second section of filter element membrane shell is used for defining a second filter element, the first filter element is positioned on the periphery of the second section of filter element membrane shell, so that the first filter element and the second filter element are arranged inside and outside in the radial direction, water is filtered by the first filter element on the radial outer side and is sent out from a water production outlet, and water which does not enter the first filter element reaches the second filter element for filtering, so that a first-stage two-section filtering structural form is formed, and the utilization efficiency and the recovery efficiency of waste water are improved.

In some embodiments, the cartridge housing 3 is a cylindrical structure, the first hollow fiber filtration membrane filaments extend along the axial direction of the cartridge housing 3, and the second hollow fiber filtration membrane filaments extend along the axial direction of the cartridge housing 3; the first hollow fiber filtering membrane filaments are multiple and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell 3; the second hollow fiber filtering membrane filaments are a plurality of and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell 3. The filter element shell is a preferred structure form of the filter element shell, and the first hollow fiber filtering membrane wire and the second hollow fiber filtering membrane wire extend along the axial direction, and the first hollow fiber filtering membrane wire and the second hollow fiber filtering membrane wire are arranged at intervals, so that the contact area with water can be effectively increased in the space direction, the membrane area is increased, and the filtering effect is improved.

In some embodiments, the raw water inlet 100 is disposed at an axial first end of the filter element housing 3, a first channel 6 is disposed between the first section of the filter element membrane shell 4 and the filter element housing 3, a first cavity 7 is formed between the second section of the filter element membrane shell 5 and the filter element housing 3, the first filter element 1 is disposed in the first cavity 7, the raw water inlet 100 is communicated with one end of the first channel 6, and the other end of the first channel 6 is communicated with the first cavity 7, so as to filter water introduced into the first filter element 1. The first passage between the first section of the filter element membrane shell and the filter element shell can guide raw water into the first filter element through the first cavity for filtering, and pure water enters the hollow interior of the first filter element, and waste water which cannot enter the hollow interior of the first filter element is further filtered by the second filter element, so that the waste water utilization rate is improved.

In some embodiments, the second section of the filter cartridge membrane shell 5 forms a second cavity 8 inside, the second filter cartridge 2 is located in the second cavity 8, at least one first section of waste water outlet 51 is formed on the second section of the filter cartridge membrane shell 5 in a manner of penetrating through the inner wall and the outer wall of the second section of the filter cartridge membrane shell, and water in the first cavity 7 can enter the second cavity 8 through the first section of waste water outlet 51. The waste water filtered from the first filter element can be guided into the second cavity through the second cavity in the second section of filter element membrane shell and enters the second cavity through the first section of waste water outlet, and then is filtered at the second filter element, so that the utilization efficiency of the waste water is improved.

In some embodiments, a second channel 10 is further provided between one axial end of the first filter element 1 and the first filter element membrane shell 4, water filtered by the first filter element 1 enters the second channel 10, the first axial end of the filter element housing 3 is provided with the water production outlet 200, a third channel 11 is further provided between one axial end of the second filter element membrane shell 5 and the water production outlet 200, water filtered by the second filter element 2 enters the third channel 11, and the second channel 10 and the third channel 11 can discharge filtered water through the water production outlet 200 after being communicated. The pure water filtered out from the first filter element can be guided into the second channel through the second channel between the axial end of the first filter element and the first section of filter element membrane shell, and then guided out through the production outlet, and meanwhile, the pure water can be guided out to the water production port through the third channel between the axial end of the second section of filter element membrane shell and the water production outlet.

In some embodiments, the axial first end of the filter element housing 3 is further provided with the wastewater outlet 300, the axial one end of the second-stage filter element membrane shell 5 is further communicated with a communicating pipe 12, one end of the communicating pipe 12 is communicated with the wastewater outlet 300, and the other end of the communicating pipe is communicated with the portion, located at the radial inner side of the second filter element 2, in the second cavity 8, so that water which does not enter the second filter element 2 can be discharged through the wastewater outlet 300 through the communicating pipe 12. The filter element shell is provided with a wastewater outlet at the first axial end and a communicating pipe at the second section of the filter element membrane shell, so that wastewater in the radial inner side part of the second filter element in the second cavity can be led out to the wastewater outlet through the communicating pipe, and the filtered wastewater can be effectively led out.

In some embodiments, the first filter element 1 is provided with a first bonding portion 131 at one axial end thereof, and a second bonding portion 132 at the other axial end thereof, the first bonding portion 131 and the outer periphery of the second bonding portion 132 are respectively provided with a first section of filter element end cover 13a, the outer periphery of the first section of filter element end cover 13a is connected with the first section of filter element membrane shell 4 in a sealing manner, and the first bonding portion 131 and the first section of filter element membrane shell 4 form the second channel 10 in the axial direction. The first filter element end cover is arranged on the radial inner side of the first section of filter element membrane shell and is in sealing connection with the first section of filter element membrane shell, and the sealing ring is arranged, so that the fixation of one axial end of the first filter element is realized, and the first bonding part can accommodate water to pass through.

In some embodiments, the axial end of the second filter element 2 is provided with a third bonding portion 16a in a connecting manner, the axial other end is provided with a fourth bonding portion 16b in a connecting manner, the outer periphery of the third bonding portion 16a and the outer periphery of the fourth bonding portion 16b are sleeved on the second section filter element membrane shell 5, the inner periphery of the third bonding portion 16a penetrates through the communication pipe 12, water filtered out from the inside of the second filter element 2 can enter the third channel 11 after passing through the third bonding portion 16a, and water not entering the inside of the second filter element 2 enters the communication pipe 12. The axial end of the second filter element can be fixed through the third bonding part arranged at the axial end of the second filter element, the communicating pipe penetrates through the third bonding part, and pure water filtered out from the interior of the second filter element can penetrate through the third bonding part to enter the third channel and be discharged.

In some embodiments, a first protrusion is formed on the filter element housing 3 at a position between the produced water outlet 200 and the raw water inlet 100 and protrudes toward the first section of the filter element membrane shell 4, a second protrusion protrudes from the first section of the filter element membrane shell 4 in the axial direction toward the filter element housing 3, and the first protrusion is connected with the second protrusion with a first sealing member 18 disposed therebetween;

the periphery that lies in on the filter core shell 3 waste water outlet 300 still court the protrusion of second section filter core membrane shell 5 is formed with the third arch, the third arch forms the sleeve and locates the periphery of communicating pipe 12, and communicating pipe 12 with be provided with the second sealing member between the third arch.

According to the invention, the first bulge, the second bulge and the first sealing element are arranged to form firm sealing separation between the raw water and the produced water so as to prevent the raw water and the produced water from being mixed, and the second sealing element between the communicating pipe and the third bulge can form firm sealing action between the waste water and the pure water.

In some embodiments, the apparatus further comprises a third pipeline 600, a fourth pipeline 700 and a fifth pipeline 800, and a pump 22 and a waste water valve 23, wherein one end of the third pipeline 600 is communicated with the inlet of the pretreatment filter element 20 to introduce raw water, one end of the fourth pipeline 700 is communicated with the waste water outlet 300 to lead out waste water or concentrated water, one end of the fifth pipeline 800 is communicated with the outlet of the post-treatment filter element 21 to lead out pure water, and the waste water valve 23 is arranged on the fourth pipeline 700.

The invention provides a water purification system of a first-stage two-section composite filter element, which comprises core components such as a pretreatment filter element, a pump, a first-stage two-section composite filter element, a post-treatment filter element and the like, wherein the pretreatment filter element is a pre-filter element such as carbon, PP cotton, ultrafiltration and the like, raw water enters the pretreatment filter element through a water gap to be subjected to primary filtration in the first step, and large-particle impurities such as silt and the like in the raw water are filtered. Because nanofiltration, reverse osmosis and the like need certain osmotic pressure during filtration, raw water needs to be pressurized by a water pump and then passes through a core first-stage two-section type composite filter element, and the filter element can be reverse osmosis, nanofiltration and the like. In the water making process, raw water is firstly filtered by the first-stage filter element to respectively generate pure water and wastewater, wherein the pure water part flows out from the pure water port through the pure water runner, the wastewater part is used as the raw water of the second-stage filter element and continuously filtered by the second-stage filter element, the filtered pure water flows out from the pure water port, and the wastewater is discharged by the wastewater electromagnetic valve. This process can be implemented in two ways: 1. axial (first stage cartridge under second stage cartridge as in fig. 1), 2, radial (first stage cartridge surrounding second stage cartridge as in fig. 3). In the washing process, the waste water electromagnetic valve is opened, the pressure disappears in front of the filter element membrane, the filter element cannot play a role in filtering, and then water flows through the filter element to take away dirt on the surface of the filter element and then flows out from the waste water port, so that the purpose of cleaning the filter element is achieved. The aftertreatment cartridge can be: active carbon, ultrafiltration, etc. and the pure water is treated by a post-treatment filter element to improve the taste and then flows out for drinking.

When water is produced, the electromagnetic valve is closed, raw water enters the pretreatment filter element from the water opening for primary treatment, after being pressurized by the pump, the pretreated raw water enters the first-stage and second-stage filter elements through the raw water opening, the raw water sequentially passes through the first-stage filter element and the second-stage filter element, produced water flows into the post-treatment filter element from the pure water opening, and the pure water treated by the post-treatment filter element flows out through the pure water opening; the waste water that first order filter core produced carries out filtration treatment as the raw water of second order filter core, produces water and first order and produces water and flow into the aftertreatment filter core again through the pure water mouth jointly, and waste water flows through dense mouth of a river.

When the filter element is washed, the electromagnetic valve is opened, raw water passes through the treatment filter element and then washes the surface of the filter element by utilizing high-speed water flow, and dirt on the surface of the filter element is discharged from a waste water outlet along with the water flow.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A water purification system, its characterized in that: the method comprises the following steps:

composite filter element group spare, preliminary treatment filter core (20) and aftertreatment filter core (21), composite filter element group spare includes raw water import (100), produces water export (200), waste water export (300), first filter core (1) and second filter core (2), first filter core (1) includes first hollow fiber filtration membrane silk, second filter core (2) include second hollow fiber filtration membrane silk, the water that raw water import (100) got into can pass through first filter core (1) filters to get into when filtering the inside of first hollow fiber filtration membrane silk and finally export through producing water export (200), the hydroenergy that does not get into the inside of first filter core (1) can pass through second filter core (2) filters, and get into when filtering the inside of second hollow fiber filtration membrane silk and finally export through producing water export (200), the water which does not enter the inside of the second filter element (2) can be communicated with the waste water outlet (300) and led out;

the water outlet of the pretreatment filter element (20) can be communicated with the raw water inlet (100) through a first pipeline (400), and the water inlet of the post-treatment filter element (21) can be communicated with the water outlet (200) through a second pipeline (500).

2. The water purification system of claim 1, wherein:

the device is characterized by further comprising a filter element shell (3), wherein the raw water inlet (100), the produced water outlet (200) and the waste water outlet (300) are all arranged at the first axial end of the filter element shell (3); or the raw water inlet (100) is arranged at the axial first end of the filter element shell (3), and the produced water outlet (200) and the waste water outlet (300) are both arranged at the axial second end of the filter element shell (3).

3. The water purification system of claim 2, wherein:

the filter element shell (3) is of a cylindrical structure, the first hollow fiber filtering membrane filaments are of a straight pipe section structure and extend along the axial direction of the filter element shell (3), and the second hollow fiber filtering membrane filaments are of a straight pipe section structure and extend along the axial direction of the filter element shell (3); the first hollow fiber filtering membrane filaments are multiple and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell (3); the second hollow fiber filtering membrane filaments are multiple and are arranged at intervals along the radial direction and the circumferential direction of the filter element shell (3).

4. The water purification system of claim 2, wherein:

the filter element is characterized by further comprising a first section of filter element membrane shell (4) and a second section of filter element membrane shell (5), wherein the first section of filter element membrane shell (4) and the second section of filter element membrane shell (5) are both arranged in the filter element shell (3);

second section filter core membrane shell (5) set up in the axial one end of first section filter core membrane shell (4), second filter core (2) are located the axial one end of first filter core (1), just the radial inboard of second section filter core membrane shell (5) sets up second filter core (2), the radial inboard of first section filter core membrane shell (4) sets up first filter core (1).

5. The water purification system of claim 4, wherein:

one side of the filter element shell (3) facing the second section filter element membrane shell (5) is provided with a first channel (6), the radial inner side of the filter element shell (3) is formed into a first cavity (7), the first section filter element membrane shell (4) and the second section filter element membrane shell (5) are both positioned in the first cavity (7), the radial inner side of the first section filter element membrane shell (4) is formed into a second cavity (8), the first filter element (1) is positioned in the second cavity (8), a raw water inlet (100) is communicated with one end of the first channel (6), the other end of the first channel (6) is communicated with the first cavity (7), the first cavity (7) is communicated with the second cavity (8) through a first raw water outlet (41) formed in the first section filter element membrane shell (4) so as to guide water into the first filter element (1) for filtering, the first raw water outlet (41) is a radial through hole which radially penetrates through the inner wall and the outer wall of the first section of filter element membrane shell (4).

6. The water purification system of claim 5, wherein:

the inside of second section filter core membrane shell (5) forms third cavity (9), second filter core (2) are located in third cavity (9), be formed with at least one first section waste water export (51) along the mode of axial in order to run through its interior outer wall on first section filter core membrane shell (4), water in second cavity (8) can pass through first section waste water export (51) get into in third cavity (9).

7. The water purification system of claim 6, wherein:

still include first section filter core end cover (13a), the axial one end of first filter core (1) is connected and is provided with first bonding portion (131), the axial other end is connected and is provided with second bonding portion (132), first bonding portion (131) with the periphery of second bonding portion (132) is all overlapped and is established first section filter core membrane shell (4), the periphery of first section filter core membrane shell (4) with sealing connection between first section filter core end cover (13a), first bonding portion (13) with first section filter core end cover (13a) forms second passageway (10) in the axial direction, through water after first filter core (1) filters gets into in second passageway (10).

8. The water purification system of claim 7, wherein:

the axial one end of second section filter core membrane shell (5) still is provided with second section filter core end cover (13b), still have third passageway (11) between second section filter core membrane shell (5) and second section filter core end cover (13b), through water after second filter core (2) filters gets into in third passageway (11), second passageway (10) with third passageway (11) communicate after can pass through produce water outlet (200) and discharge the water after filtering.

9. The water purification system of claim 8, wherein:

the part of the third cavity (9) which is located on the radial inner side of the second filter element (2) is provided with a communicating pipe (12), one end of the communicating pipe (12) is communicated with the water production outlet (200), the other end of the communicating pipe is communicated with the second channel (10), and water entering the first filter element (1) can be discharged from the water production outlet (200) through the communicating pipe (12).

10. The water purification system of claim 9, wherein:

the axial one end of second filter core (2) is connected and is provided with third bonding portion (16a), the connection of the axial other end sets up fourth bonding portion (16b), the periphery of third bonding portion (16a) with the periphery of fourth bonding portion (16b) is all overlapped and is established second section filter core membrane shell (5), third bonding portion (16a) with the inner periphery of fourth bonding portion (16b) is all worn to establish communicating pipe (12), process the inside filtration hydroenergy that crosses of second filter core (2) can pass through enter behind third bonding portion (16a) in third passageway (11).

11. The water purification system of claim 8, wherein:

the filter core is characterized by further comprising a third filter element end cover (15), the third filter element end cover (15) is sleeved on the periphery of the second section of filter element membrane shell (5), a second section of wastewater outlet (52) is formed in the second section of filter element membrane shell (5) in a penetrating mode along the axial direction, a fourth channel (17) is formed between the third filter element end cover (15) and the second section of filter element end cover (13b), one end of the fourth channel (17) is communicated with the wastewater outlet (300), and the other end of the fourth channel can be communicated with the third cavity (9), so that water which does not enter the second filter element (2) can enter the fourth channel (17) through the second section of wastewater outlet (52) and then is discharged through the wastewater outlet (300); the third cartridge end cap (15) is axially spaced from the cartridge housing (3) to form the first channel (6).

12. The water purification system of claim 8, wherein:

the periphery of the second section of filter element membrane shell (5) is in sealing connection with the second section of filter element end cover (13b), and the wastewater outlet is located on the radial outer side of the water production outlet.

13. The water purification system of claim 3, wherein:

still include first section filter core membrane shell (4) and second section filter core membrane shell (5), first section filter core membrane shell (4) with second section filter core membrane shell (5) all set up in filter core shell (3), second section filter core membrane shell (5) set up in the radial inside of first section filter core membrane shell (4), second filter core (2) are located the radial inboard of first filter core (1), just the inside of second section filter core membrane shell (5) sets up second filter core (2), first filter core (1) are located the periphery of second section filter core membrane shell (5), first section filter core membrane shell (4) are located axial one side of first filter core (1).

14. The water purification system of claim 13, wherein:

raw water inlet (100) set up in the first end of axial of filter core shell (3), first section filter core membrane shell (4) with first passageway (6) have between filter core shell (3), second section filter core membrane shell (5) with form into first cavity (7) between filter core shell (3), first filter core (1) is located in first cavity (7), raw water inlet (100) with the one end intercommunication of first passageway (6), the other end of first passageway (6) with first cavity (7) intercommunication to can be leading-in water first filter core (1) department filters.

15. The water purification system of claim 14, wherein:

the inside of second section filter core membrane shell (5) forms second cavity (8), second filter core (2) are located in second cavity (8), be formed with at least one first section waste water export (51) with the mode that runs through its inner and outer wall on second section filter core membrane shell (5), water in first cavity (7) can pass through first section waste water export (51) get into in second cavity (8).

16. The water purification system of claim 15, wherein:

the water purifier is characterized in that a second channel (10) is further arranged between one axial end of the first filter element (1) and the first section of filter element membrane shell (4), water filtered by the first filter element (1) enters the second channel (10), the first axial end of the filter element shell (3) is provided with the water production outlet (200), a third channel (11) is further arranged between one axial end of the second section of filter element membrane shell (5) and the water production outlet (200), water filtered by the second filter element (2) enters the third channel (11), and the second channel (10) and the third channel (11) are communicated and then can discharge the filtered water through the water production outlet (200).

17. The water purification system of claim 16, wherein:

the filter core shell (3) the axial is still provided with on the first end waste water outlet (300), the axial of second section filter core membrane shell (5) is served and is still linked up and be provided with communicating pipe (12), the one end of communicating pipe (12) with waste water outlet (300) intercommunication, the other end with lie in second cavity (8) the radial inboard part intercommunication of second filter core (2) can make and not get into the inside water of second filter core (2) passes through communicating pipe (12) via waste water outlet (300) is discharged.

18. The water purification system of claim 17, wherein:

the axial one end of first filter core (1) is connected and is provided with first bonding portion (131), the axial other end still connects and is provided with second bonding portion (132), first bonding portion (131) with the periphery of second bonding portion (132) all overlaps and is equipped with first section filter core end cover (13a), the periphery of first section filter core end cover (13a) with sealing connection between first section filter core membrane shell (4), first bonding portion (131) with first section filter core membrane shell (4) form on the axial direction second passageway (10).

19. The water purification system of any one of claims 17-18, wherein:

the axial one end of second filter core (2) is connected and is provided with third bonding portion (16a), the connection of the axial other end is provided with fourth bonding portion (16b), third bonding portion (16a) with the periphery cover of fourth bonding portion (16b) is established second section filter core membrane shell (5), wear to establish in the interior week of third bonding portion (16a) communicating pipe (12), process the inside hydroenergy that filters out of second filter core (2) can pass through enter behind third bonding portion (16a) in third passageway (11), do not get into the inside water of second filter core (2) gets into in communicating pipe (12).

20. The water purification system of claim 19, wherein:

when including first section filter core end cover (13a) and bottom end cover (14) simultaneously, the periphery of second section filter core membrane shell (5) with sealing connection between first section filter core end cover (13a), the axial other end of second filter core (2) is connected and is provided with fourth bonding portion (16b), fourth bonding portion (16b) are worn to locate the interior week of second section filter core membrane shell (5) just the axial one end of fourth bonding portion (16b) is fixed in on bottom end cover (14).

21. The water purification system of claim 17, wherein:

a first bulge is formed on the filter element shell (3) between the water production outlet (200) and the raw water inlet (100) in a protruding mode towards the first section of filter element membrane shell (4), a second bulge is formed on the first section of filter element membrane shell (4) in a protruding mode towards the direction of the filter element shell (3) along the axial direction, the first bulge is connected with the second bulge, and a first sealing element (18) is arranged between the first bulge and the second bulge;

the periphery that lies in on filter core shell (3) waste water outlet (300) still court second section filter core membrane shell (5) protrusion is formed with the third arch, the third arch forms the sleeve and the cover is located the periphery of communicating pipe (12), and communicating pipe (12) with be provided with the second sealing member between the third arch.

22. The water purification system of any one of claims 1-21, wherein:

the first hollow fiber filtration membrane filaments are hollow fiber nanofiltration membrane filaments or hollow reverse osmosis membrane filaments.

23. The water purification system of any one of claims 1-22, wherein:

the water purifier is characterized by further comprising a third pipeline (600), a fourth pipeline (700), a fifth pipeline (800), a pump (22) and a waste water valve (23), wherein one end of the third pipeline (600) is communicated with an inlet of the pretreatment filter element (20) to feed raw water, one end of the fourth pipeline (700) is communicated with the waste water outlet (300) to lead out waste water or concentrated water, one end of the fifth pipeline (800) is communicated with an outlet of the post-treatment filter element (21) to lead out pure water, and the waste water valve (23) is arranged on the fourth pipeline (700).