CN215712120U

CN215712120U - Composite filter element with reverse osmosis filter element and water purifier

Info

Publication number: CN215712120U
Application number: CN202120552577.9U
Authority: CN
Inventors: 龚圆杰; 张涛; 何海; 周栋; 范婷
Original assignee: Guangdong Chunmi Electrical Technology Co Ltd
Current assignee: Guangdong Chunmi Electrical Technology Co Ltd
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2022-02-01
Anticipated expiration: 2031-03-17

Abstract

The present disclosure relates to a composite filter element and purifier with reverse osmosis filter element, this composite filter element includes: a water inlet, a pure water outlet and a wastewater outlet are arranged on the filter flask; a filter material end cap; the leading filter element subassembly includes: leading compound filter media and an isolation cylinder, leading PP filter media with leading carbon-point filter media is annular cylinder, and the reverse osmosis filter core is located the inside cavity region of leading filter element group spare, the reverse osmosis filter core is annular cylinder, and rearmounted filter element group spare is fixed in the filter flask, be located the below of reverse osmosis filter core, including rearmounted end cover and rearmounted filter media. The technical scheme can improve the reliability of the filter element and reduce the diameter of the whole filter element, the filter material structure has high standardization degree, low abnormal rate, low cost and high production efficiency, and the quality of the outlet water is guaranteed.

Description

Composite filter element with reverse osmosis filter element and water purifier

Technical Field

The disclosure relates to the technical field of water purification, in particular to a composite filter element with a reverse osmosis filter element and a water purifier.

Background

Along with the demand of water purifier and clean drink machine miniaturization, the quantity and the form of filter core in water purifier and the clean drink machine are in continuous evolution, from initial 5 filter cores to 3 filter cores of complete machine, to 1 filter core of complete machine again, along with the improvement of integrating of filter core, the diameter and the inside of single filter core arrange and add complicacy more and more, this production efficiency and the yield that will influence the filter core certainly.

The prior composite filter element mainly has the following problems: 1) the diameter of the filter element is very thick, and is even larger than the diameter of 110mm, the larger the diameter is, the better the pressure resistance is, the wall thickness of the filter cylinder is increased, and the cost is increased; 2) for integration, the specifications of 3-5 filter materials in the filter element are 1 or 2 unconventional shapes, so that the standardization rate is low, the manufacturing complexity is high, and the qualification rate is also influenced; 3) the water paths in the filter element are complex, different water paths in the filter element need to be isolated, a plurality of sealing rings and isolating cylinders are used for isolation, and the more the sealing rings are, the higher the water channeling risk is; the more the spacer cylinder, the thicker the diameter of the filter element.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the related art, the embodiment of the disclosure provides a composite filter element with a reverse osmosis filter element and a water purifier. The technical scheme is as follows:

according to an aspect of an embodiment of the present disclosure, there is provided a composite filter element having a reverse osmosis filter element, including:

the filter flask is provided with a water inlet, a pure water outlet and a wastewater outlet;

the filter material end cover is positioned at the top end of the filter bottle and comprises a first annular groove and a second annular groove, and the first annular groove surrounds the second annular groove;

the preposed filter element assembly is fixed in the filter bottle and comprises a preposed composite filter material and an isolating cylinder, the preposed composite filter material is an annular cylinder, the first annular groove and the isolating cylinder are clamped and fixed with the preposed composite filter material, and the outer wall of the isolating cylinder is matched with the inner wall of the filter bottle to guide raw water entering from the water inlet to flow to the outer ring water inlet side of the preposed composite filter material;

the reverse osmosis filter element is fixed in the filter bottle and is positioned in the hollow area inside the front filter element assembly, the reverse osmosis filter element is an annular cylinder, the upper end of the reverse osmosis filter element is positioned in the second annular groove, the purified water filtered by the front composite filter material flows out from the water outlet side of the inner ring of the front composite filter material, the purified water flows to the water inlet side of the upper end of the reverse osmosis filter element under the blockage of the upper end of the isolation cylinder, the purified water generated by the reverse osmosis filter element flows out from the central tube of the inner ring of the reverse osmosis filter element, and the wastewater generated by the reverse osmosis filter element flows out from the wastewater side of the lower end of the reverse osmosis filter element;

the rear filter element assembly is fixed in the filter bottle, is positioned below the reverse osmosis filter element in the hollow area in the front filter element assembly, and comprises a rear end cover and a rear filter material, the rear filter material is positioned in the rear end cover, the upper end opening of the rear end cover is communicated with the inner ring central tube of the reverse osmosis filter element, and the lower end opening of the rear end cover is communicated with the pure water outlet in a sealing way;

wherein, the upper end outer wall of rearmounted end cover with keep apart a cooperation formation third annular groove, the lower extreme of reverse osmosis filter core is located in the third annular groove, the third annular groove with second annular groove clamp is fixed the reverse osmosis filter core, the waste water that the waste water side of reverse osmosis filter core flows passes through keep apart a section of thick bamboo with passageway intercommunication between the rearmounted end cover waste water outlet on the filter flask.

In one embodiment, the isolation cylinder is integrally formed and comprises an L-shaped sleeve and a groove-shaped annular cylinder, the lower part of the preposed composite filter material is positioned in the groove-shaped annular cylinder, the upper part of the preposed carbon rod filter material is positioned in a first annular groove, and the groove-shaped annular cylinder and the first annular groove clamp and fix the preposed composite filter material.

In one embodiment, a first annular barrier and a second annular barrier are arranged at the inner wall of the bottom of the filter bottle, and the first annular barrier surrounds the second annular barrier; the first annular barrier piece is connected with the lower end of the isolation cylinder in a sealing mode, and the second annular barrier piece is connected with the lower end of the rear end cover in a sealing mode.

In one embodiment, further comprising:

the first sealing ring group is positioned at the joint of the first annular barrier piece and the lower end of the isolating cylinder, so that the first annular barrier piece is connected with the lower end of the isolating cylinder in a sealing way;

and the second sealing ring group is positioned at the joint of the second annular barrier piece and the lower end of the rear end cover, so that the second annular barrier piece is connected with the lower end of the rear end cover in a sealing way.

In one embodiment, further comprising:

the third sealing ring group is positioned at the joint of the upper end opening of the rear end cover and the inner ring central tube of the reverse osmosis filter element;

and the fourth sealing ring group is positioned between the outer side of the rear filter material and the inner wall of the rear end cover and is used for preventing the pure water in the central tube of the inner ring from flowing out of the lower end opening of the rear end cover without passing through the rear filter material.

In one embodiment, the method comprises the following steps:

the first annular groove and the second annular groove share a groove wall.

In one embodiment, the water inlet, the pure water outlet and the waste water outlet are located at the bottom of the filter flask.

In one embodiment, the water inlet, the pure water outlet and the wastewater outlet are provided with one-way water stopping devices, and the one-way water stopping devices are used for stopping water flowing at the water inlet, the pure water outlet and the wastewater outlet when the composite filter element is disassembled.

In one embodiment, the pre-composite filter comprises a filter compounded by folding PP and a carbon rod;

the post-filter material comprises at least one filter material of active carbon, PP cotton, folded paper PP, an ultrafiltration membrane, a microfiltration membrane and a mineralizer.

According to another aspect of the disclosed embodiment, there is provided a water purifier, including any one of the composite filter elements described above.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

1) the front composite filter material and the reverse osmosis filter element used in the embodiment are both conventional annular cylinder structures, and the rear filter material is a standard cylindrical structure, both conventional structures, so that the standardization degree is high, the abnormal rate is low, and the cost is low;

2) use leading compound filter media in this disclosure to close fixedly by first annular groove on this filter media end cover and this isolation collet chuck, this reverse osmosis filter core is fixed by second annular groove on this filter media end cover and this rearmounted end cover clamp, this rearmounted filter media is fixed by this rearmounted end cover clamp, so only need set up one among the compound filter core that this disclosure provided and keep apart a section of thick bamboo, a filter media end cover and a rearmounted end cover cooperate fixed each filter media and keep apart the water course, the isolation section of thick bamboo and the end cover of use are few, be favorable to improving the reliability and reduce the diameter of whole filter core.

3) The water route among this composite filter element circulates smoothly, gets into leading filter element group spare from the filter flask bottom and carries out leading filtration back, gets into reverse osmosis filter core from the top again and flows out from the filter flask bottom after this rearmounted filter core of flow direction from top to bottom filters, is favorable to the discharge of filter flask inside air, avoids the gas to block up.

4) The composite filter element provided by the disclosure has the advantages that the structure is simple and compact, the diameter of the filter element is smaller, the small diameter is better in pressure resistance, the wall thickness of the filter bottle can be properly reduced, the cost is reduced, the production efficiency of the composite filter element provided by the disclosure is high, and the quality of outlet water is guaranteed.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic cross-sectional view of a composite filter element having a reverse osmosis filter element according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram of a water purifier according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present disclosure provides a composite filter element with a reverse osmosis filter element, and fig. 1 is a schematic sectional structure diagram of a composite filter element with a reverse osmosis filter element according to an exemplary embodiment.

As shown in fig. 1, the composite filter element includes a filter bottle 11, and a filter end cap 12, a front composite filter 13, a separation cylinder 14, a reverse osmosis filter element 15 and a rear filter element assembly 16 which are located in the filter bottle 11.

As shown in fig. 1, the filter flask 11 is provided with a water inlet 111, a pure water outlet 112 and a waste water outlet 113; here, the water inlet 111 is an inlet of raw water to be purified by the composite filter element, and the pure water outlet 112 is an outlet of pure water produced by purification through the pre-composite filter material 13, the reverse osmosis filter element 15, and the post-filter element in the composite filter element, and the waste water is an outlet of waste water produced by the reverse osmosis filter element 15 in the composite filter element.

As shown in fig. 1, a filter end cap 12 is disposed in the filter bottle 11, the filter end cap 12 is located at the top end of the filter bottle 11, and includes a first annular groove 121 and a second annular groove 122, the first annular groove 121 surrounds the second annular groove 122; the first and second

annular grooves

121 and 122 are used to secure the respective filter media within the filter flask 11.

As shown in fig. 1, a leading filter element assembly for purifying raw water is arranged in the filter bottle 11, and the leading filter element assembly is fixed in the filter bottle 11 and comprises a leading composite filter material 13 and an isolation cylinder 14, the leading composite filter material 13 is an annular cylinder, a first annular groove 121 is clamped and fixed with the isolation cylinder 14 in the leading composite filter material 13, the outer wall of the isolation cylinder 14 is matched with and guided by the inner wall of the filter bottle 11, and the raw water entering from the water inlet 111 flows to the outer ring water inlet side of the leading composite filter material 13.

As shown in fig. 1, a reverse osmosis filter element 15 is arranged in the filter bottle 11, the reverse osmosis filter element 15 is fixed in the filter bottle 11 and is positioned in the hollow area inside the front filter element component, the whole of the preposed filter element component is an annular cylinder, the reverse osmosis filter element 15 is positioned in the hollow area of the inside of the annular cylinder, the reverse osmosis filter element 15 is an annular cylinder, the upper end of the reverse osmosis filter element 15 is positioned in the second annular groove 122, the purified water filtered by the preposed composite filter material 13 flows out from the inner ring water outlet side of the preposed composite filter material 13, the water blocked at the upper end of the isolating cylinder 14 flows to the upper water inlet side of the reverse osmosis filter element, pure water generated by the reverse osmosis filter element 15 flows out of the inner ring central pipe of the reverse osmosis filter element 15, the wastewater generated from the reverse osmosis filter element 15 flows out from the lower wastewater side of the reverse osmosis filter element 15.

The rear filter element assembly 16 is fixed in the filter bottle 11, is positioned below the reverse osmosis filter element in the hollow area in the front filter element assembly, and comprises a rear end cover 161 and a rear filter material 162, the rear filter material 162 is positioned in the rear end cover 161, the upper end opening of the rear end cover 161 is communicated with the inner ring central tube of the reverse osmosis filter element 15, and the lower end opening of the rear end cover 161 is communicated with the pure water outlet 112 in a sealing way; it should be noted that the rear end cap 161 may include a rear upper end cap and a rear lower end cap, and the rear filter 162 may be placed in the rear upper end cap first during assembly, and then the rear lower end cap and the rear upper end cap are assembled together in a snap-fit manner.

Wherein, the outer wall of rearmounted end cover 161 with keep apart a section of thick bamboo 14 cooperation and form the third annular groove, reverse osmosis filter core 15's lower extreme is located in the third annular groove, the third annular groove with second annular groove 122 clamping is fixed reverse osmosis filter core 15, the waste water of reverse osmosis filter core 15's waste water side outflow passes through keep apart a section of thick bamboo 14 with passageway intercommunication between the rearmounted end cover 161 waste water outlet 113 on the filter flask 11.

Here, the composite filter element provided by the present disclosure is mainly suitable for a table top water purifier, raw water entering the composite filter element is pressurized, and the pressure reaches the working pressure required by the reverse osmosis filter element 15, for example, the pressure is 0.4-0.8 Mpa. As shown by arrows in fig. 1, pressurized raw water enters from a water inlet 111, enters the outer ring water inlet side of the front filter element assembly 13 through a passage between the outer wall of the isolation cylinder 14 and the inner wall of the filter flask 11, and passes through the front filter element assembly 13 from outside to inside, and the front filter element assembly 13 can remove large particles such as rust sand, worm eggs and the like in water and effectively remove organic matters, peculiar smell and residual chlorine in water; then flows to the outer ring side of the reverse osmosis filter element through the opening between the upper end of the isolation cylinder 14 and the filter material end cover 12, and flows to the upper water inlet side of the reverse osmosis filter element under the blocking of the upper end of the isolation cylinder 14, wherein it should be noted that the upper end of the isolation cylinder 14 is hermetically connected with the reverse osmosis filter element, so that the purified water coming out of the preposed carbon rod filter material 14 is blocked from flowing to the lower end of the reverse osmosis filter element and only flows to the upper water inlet side of the reverse osmosis filter element, after the purified water enters from the upper end of the reverse osmosis filter element, under a certain pressure, water molecules can pass through the RO membrane, and impurities such as inorganic salts, heavy metal ions, organic matters, colloids, bacteria, viruses and the like in the purified water cannot pass through the RO membrane, so that the pure water which can pass through the RO membrane and the waste water which cannot pass through the RO membrane are strictly distinguished, the inner ring side of the reverse osmosis filter element is the pure water side, and the lower side of the reverse osmosis filter element is the waste water side, the concentrated water cannot permeate the RO membrane, and only flows out from the wastewater side of the reverse osmosis filter element 15, and flows to the wastewater outlet 113 through the channel between the isolation cylinder 14 and the rear end cover 161 to be discharged; pure water can flow out from the inner ring central pipe of the reverse osmosis filter element 15 through the RO membrane, the pure water produced in the inner ring central pipe can vertically flow into the post filter material 162 through the upper end opening of the post end cap 161, and the post filter material 162 can adjust the pure water into weak alkaline water to improve the taste.

Here, the front filter element assembly 13 and the reverse osmosis filter element 15 used in the present disclosure are both of a conventional annular cylindrical structure, and the rear filter material 162 is of a standard cylindrical structure, both of which are conventional structures, and has high standardization degree, low anomaly rate and low cost.

Here, in the present disclosure, the pre-filter element assembly 13 is clamped and fixed by the first annular groove 121 on the filter end cover 12 and the separation cylinder 14, the reverse osmosis filter element 15 is clamped and fixed by the second annular groove 122 and the third annular groove on the filter end cover 12, and the post-filter element 162 is clamped and fixed by the post-end cover 161, so that only one separation cylinder 14, one filter end cover 12 and one post-end cover 161 need to be arranged in the composite filter element provided by the present disclosure to cooperate and fix each filter material and separate the water channel, the used separation cylinder 14 and end covers are few, which is beneficial to improving the reliability and reducing the diameter of the whole filter element.

Here, the water route among this composite filter core circulates smoothly, gets into leading filter element group spare from filter flask 11 bottom and carries out leading filtration after, gets into reverse osmosis filter core 15 again from upper portion from the top down and flow to this rearmounted filter core from the filter flask 11 bottom after filtering, is favorable to the discharge of the inside air of filter flask 11, avoids the gas to block up.

Here, the composite filter element that this disclosure provided simple structure, compactness, the diameter of filter element is less, and little diameter is withstand voltage just better, and the wall thickness of filter flask 11 can suitably be reduced, reduce cost, and the composite filter element that this disclosure provided production efficiency is high, and it is guaranteed to go out water quality.

In a possible embodiment, as shown in fig. 2, the isolating cylinder 14 is formed integrally and includes an L-shaped sleeve 141 and a grooved annular cylinder 142, the lower portion of the advanced composite filter 13 is located in the grooved annular cylinder 142, the upper portion of the advanced carbon rod filter 14 is located in the first annular groove 121, and the grooved annular cylinder 142 and the first annular groove 121 sandwich and fix the advanced composite filter 13.

In a possible embodiment, a first annular barrier 114 and a second annular barrier 115 are provided at the bottom inner wall of the filter flask 11, the first annular barrier 114 surrounding the second annular barrier 115; the first annular barrier 114 is connected with the lower end of the isolation cylinder 14 in a sealing way, so that a wastewater waterway and a raw water waterway are prevented from water channeling; the second annular stopper 115 is hermetically connected to the lower end of the rear end cap 161 to prevent the pure water path and the waste water path from leaking.

In one possible embodiment, as shown in fig. 2, the composite filter element further comprises: a first seal ring set 21 and a second seal ring set 22.

The first sealing ring group 21 is positioned at the joint of the first annular blocking piece 114 and the lower end of the isolation cylinder 14, so that the first annular blocking piece 114 is connected with the lower end of the isolation cylinder 14 in a sealing way, and a wastewater waterway and a raw water waterway are prevented from water channeling; the second sealing ring set 22 is located at the joint of the second annular stopper 115 and the lower end of the rear end cap 161, so that the second annular stopper 115 is connected with the lower end of the rear end cap 161 in a sealing manner, and a pure water channel and a waste water channel are prevented from leaking water.

Here, the first seal ring group 21 may be two seal rings, and the second seal ring group 22 may be two seal rings, so that sealing can be performed better.

The water channel sealing device disclosed by the utility model needs two sealing ring groups to seal and separate each water channel, the used sealing rings are few, and the risk of water channeling is low.

In a possible embodiment, preferably, as shown in fig. 2, the composite filter element further comprises: a third set of seals 23 and a fourth set of seals 24.

The third sealing ring group 23 is located at the joint between the upper end opening of the rear end cap 161 and the inner ring center tube of the reverse osmosis filter element 15, and is used for preventing pure water in the inner ring center tube from flowing to the wastewater side through a gap between the reverse osmosis filter element 15 and the rear end cap 161, and preventing a pure water channel and a wastewater channel from flowing; and a fourth seal ring group 24 located between the outer side of the post filter 162 and the inner wall of the post end cap 161, for preventing pure water in the inner ring center tube from flowing out from the lower end opening of the post end cap 161 without passing through the post filter 162.

In one possible embodiment, as shown in fig. 2, the first annular groove 121 and the second annular groove 122 share a groove wall.

In a possible embodiment, the water inlet 111, the pure water outlet 112 and the waste water outlet 113 are all located at the bottom of the filter flask 11, so as to facilitate the installation or the removal of the composite filter element in the water purifier.

In a possible embodiment, the water inlet 111, the pure water outlet 112 and the waste water outlet 113 are each provided with one-way water stop means for stopping the flow of water at the water inlet 111, the pure water outlet 112 and the waste water outlet 113 when the composite cartridge is replaced. Like this, when needing to clean, maintain or change this composite filter element, dismantle from the purifier and take out this composite filter element, one-way stagnant water device will prevent that the rivers in this composite filter element from flowing, avoids appearing dripping or the phenomenon of leaking.

In one possible embodiment, the pre-composite filter comprises a filter compounded by folding PP and a carbon rod; the folded PP (the filtration precision can be 5 mu m) can remove the large particles such as rust sediment worm eggs and the like in water; the carbon rod can effectively remove organic matters, peculiar smell and residual chlorine in the water;

the post-filter 162 comprises at least one filter material selected from activated carbon, PP cotton, origami PP, an ultrafiltration membrane, a microfiltration membrane and a mineralizer. The post-filter material 162 is used for further filtering the flowing pure water, filtering out particle impurities in the water, and improving the taste of the pure water, inhibiting bacteria and resisting bacteria and retaining microorganisms.

The disclosure also provides a water purifier, which comprises any one of the composite filter elements.

For example, fig. 2 is a schematic structural diagram of a water purifier shown according to an exemplary embodiment, and as shown in fig. 2, the water purifier includes a composite filter element 1 and a booster pump 2, a tap water port of the water purifier is communicated with a water inlet of the booster pump, a water outlet of the booster pump is communicated with a water inlet 111 of the composite filter element 1, a wastewater outlet 113 of the composite filter element is communicated with a wastewater port of the water purifier, and a pure water outlet 112 of the composite filter element is communicated with a pure water port of the water purifier.

Here, after the external tap water enters the water purifier from the tap water port, the external tap water may be pressurized by the booster pump and then flow into the composite filter element, and after the filtration and purification of the pre-PP filter material 13, the pre-carbon filter material 14, the reverse osmosis filter element 15, and the post-filter material 162 in the reverse osmosis filter element 15, the generated pure water flows out from the pure water outlet 112 of the composite filter element to the pure water port of the water purifier, and further flows to the faucet for use, and the generated wastewater flows out from the wastewater outlet 113 of the composite filter element to the wastewater port of the water purifier and is discharged.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.

Claims

1. A composite filter element having a reverse osmosis filter element, comprising:

2. The composite filter element of claim 1,

the isolating cylinder is integrally formed and comprises an L-shaped sleeve and a groove-shaped annular cylinder, the lower portion of the front composite filter material is located in the groove-shaped annular cylinder, the upper portion of the front composite filter material is located in a first annular groove, and the groove-shaped annular cylinder and the first annular groove are clamped and fixed with the front composite filter material.

3. The composite filter element of claim 1,

a first annular blocking piece and a second annular blocking piece are arranged on the inner wall of the bottom of the filter bottle, and the first annular blocking piece surrounds the second annular blocking piece; the first annular barrier piece is connected with the lower end of the isolation cylinder in a sealing mode, and the second annular barrier piece is connected with the lower end of the rear end cover in a sealing mode.

4. The composite filter element of claim 3, further comprising:

5. The composite filter element of claim 1, further comprising:

6. The composite filter element of claim 1, comprising:

the first annular groove and the second annular groove share a groove wall.

7. The composite filter cartridge of claim 1, wherein the water inlet, pure water outlet, and waste water outlet are located at the bottom of the filter flask.

8. The composite cartridge of claim 1 wherein the water inlet, pure water outlet and waste water outlet are each provided with one-way water shut-off means for stopping water flow at the water inlet, pure water outlet and waste water outlet when the composite cartridge is removed.

9. A water purification machine, characterized in that it comprises a composite filter element according to any one of claims 1 to 8.