CN212356799U - Composite filter element and water purifier system - Google Patents

Abstract

The utility model relates to a composite filter element and purifier system, composite filter element includes the filter flask and sets up leading composite filter element and the diaphragm type filtering component in the filter flask at the interval in proper order, diaphragm type filtering component includes the diaphragm type filter layer, the carbon-point, center pipeline section and water sealing end cover, carbon-point and center pipeline section intercommunication form central pipe fitting, the diaphragm type filter layer cover is outside central pipe fitting, water sealing end cover sets up the tip that is close to leading composite filter element on central pipe fitting, the terminal surface that is close to diaphragm type filtering component on the leading composite filter element is equipped with first adapter sleeve, first adapter sleeve is outside the diaphragm type filtering layer, be equipped with the through-hole on the first adapter sleeve. The integration level is improved, and meanwhile, the water circuit layout in the composite filter element is simple. And the central pipe fitting in the middle of the membrane type filter layer is formed by combining a carbon rod and a central pipe section, so that the filtering requirement is met, and the material cost is effectively controlled. Thereby the manufacturing cost of composite filter element has been reduced on the whole, the replacement cost is reduced.

Description

Composite filter element and water purifier system

Technical Field

The utility model relates to a water purification unit technical field especially relates to combined filter core and purifier system.

Background

With the continuous development of the technical field of water purifying equipment, the water purifier tends to be more and more miniaturized and integrated. To improve the integration, multiple stages of filter elements are generally integrated into one filter flask. In order to enable water flow to accurately flow according to the arrangement of the filter elements at all levels, the water path needs to be reasonably arranged in the filter element with higher integration level. The water purification unit needs to replace the filter element after being used for a period of time, so that the water purification unit recovers the water purification capacity. The filter element replacement cost is too high, which will hinder the popularization of water purification equipment. The replacement cost of the filter element is directly influenced by the manufacturing cost, and the manufacturing cost is mainly related to the simplicity of the internal structure of the filter element and the material cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the higher problem of filter core replacement cost, provided a composite filter core and purifier system, through simplifying the water route overall arrangement, reduced manufacturing cost to reach the technological effect who reduces the replacement cost.

The utility model provides a composite filter element, includes the filter flask and sets up at interval in proper order leading composite filter element and membrane type filtering component in the filter flask, membrane type filtering component includes membrane type filter layer, carbon-point, central pipeline section and seals the water end cover, the carbon-point with central pipeline section intercommunication forms central pipe fitting, the membrane type filter layer cover is in outside the central pipe fitting, it sets up to seal the water end cover be close to on the central pipe fitting leading composite filter element's tip, be close to on the leading composite filter element the terminal surface of membrane type filtering component is equipped with first adapter sleeve, first adapter sleeve is in outside the membrane type filtering layer, be equipped with the through-hole on the first adapter sleeve, be used for making leading composite filter element filters the leading drainage flow direction of obtaining membrane type filtering component.

The scheme provides a composite filter element, and the preposed composite filter element, the membrane type filter layer and the carbon rod are integrated in the filter bottle, so that the integration level is improved. And the integration level is improved, and meanwhile, the water circuit layout in the composite filter element is simple. Specifically, the pre-filtered water obtained by filtering through the pre-composite filter element enters a gap between the first adapter sleeve and the membrane type filter layer from a through hole on the first adapter sleeve, then enters the membrane type filter layer from a raw water inlet at the end part of the membrane type filter layer, and is filtered through the membrane type filter layer and the carbon rod in sequence to obtain pure water for users to use. And the central pipe fitting in the middle of the membrane type filter layer is formed by combining the carbon rod and the central pipe section, so that the filtering requirement is met, and the material cost is effectively controlled. Therefore, the manufacturing cost of the composite filter element is reduced on the whole, and the replacement cost is reduced.

In one embodiment, the carbon rod is closer to the first adapter sleeve than to the central tube section, and the water sealing end cap is arranged at the end of the carbon rod far away from the central tube section.

In one embodiment, an ultrafiltration membrane cartridge is disposed in the central tube section.

In one embodiment, the end part of the central pipe section, which is far away from the carbon rod, is turned inwards to form an inner cylinder, the inner cylinder is tightly abutted against the outer peripheral surface of the water outlet end of the ultrafiltration membrane filter element, and a first sealing element is arranged between the inner cylinder and the water outlet end of the ultrafiltration membrane filter element.

In one embodiment, the filter bottle is provided with a raw water port, a pure water port and a waste water port, a raw water gap is formed between the outer peripheral surface of the front composite filter element and the filter bottle at intervals, the raw water port is communicated with the raw water gap, one end of the central pipe piece, far away from the front composite filter element, is communicated with the pure water port, and a concentrated water outlet of the membrane type filter layer is communicated with the waste water port.

In one embodiment, the membrane filter further comprises a second adapter sleeve and a guide sleeve, the second adapter sleeve is sleeved at one end, far away from the front composite filter element, of the membrane filter assembly, a concentrated water outlet of the membrane filter layer is located on an end face sleeved with the second adapter sleeve, the guide sleeve is inserted into the second adapter sleeve, the guide sleeve is communicated with the central pipe fitting and the pure water port, a waste water cavity is formed between the guide sleeve and the second adapter sleeve at intervals, and the waste water cavity is communicated with the waste water port.

In one embodiment, the raw water port, the pure water port and the waste water port are all arranged on the end face, far away from the front composite filter element, of the filter flask, a water passing gap is formed between the outer peripheral surface of the membrane type filtering assembly and the filter flask at intervals, a gap is formed between the first adapter sleeve and the filter flask, the water passing gap is communicated with the raw water gap, and a gap is formed between the second adapter sleeve and the filter flask, so that the raw water port is communicated with the water passing gap.

In one embodiment, the preposed composite filter element comprises a paper folding filter element and a carbon rod filter element, the paper folding filter element is sleeved outside the carbon rod filter element, and the through hole is communicated with the middle channel of the carbon rod filter element.

In one embodiment, the membrane filtration layer comprises a reverse osmosis membrane.

A purifier system, includes foretell composite filter core.

The above scheme provides a purifier system, through adopting the composite filter element in any above embodiment to effectively reduce the cost of renew cartridge.

In one embodiment, the raw water port of the filter bottle is provided with a raw water pipe, the waste water port of the filter bottle is provided with a waste water pipe, a pure water pipe is arranged between the pure water port of the filter bottle and a user faucet, the pure water pipe is used for being communicated with the user faucet, the raw water pipe is sequentially provided with a water inlet switch valve and a water pump, the water inlet switch valve is located at the upstream of the water pump, the waste water pipe is provided with a waste water switch valve, the pure water pipe is provided with a check valve and a pressure switch valve, and the check valve is located at the upstream of the pressure switch valve.

Drawings

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

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

Fig. 1 is a schematic structural diagram of a composite filter element according to the present embodiment;

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

FIG. 3 is a schematic view of the cross-sectional view of FIG. 2 illustrating the direction of water flow;

FIG. 4 is an exploded view of the composite filter element of FIG. 1;

FIG. 5 is a schematic structural view of a membrane filtration module according to the present embodiment;

FIG. 6 is a cross-sectional view taken along line B-B of the membrane filtration module of FIG. 5;

FIG. 7 is a cross-sectional view of another embodiment of the membrane filtration module;

FIG. 8 is a schematic structural diagram of a front composite filter element according to the present embodiment;

FIG. 9 is a cross-sectional view taken along line C-C of the leading composite filter element of FIG. 8;

fig. 10 is a system diagram of the water purifier system according to this embodiment.

Description of reference numerals:

10. a composite filter element; 11. a filter flask; 111. a bottle body; 1111. a raw water port; 1112. a waste water port; 1113. a pure water port; 112. a bottle cap; 113. a raw water gap; 114. a water passing gap; 115. a waste water chamber; 12. a front composite filter element; 121. a paper folding filter element; 122. a carbon rod filter element; 13. a membrane filtration module; 131. a membrane filter layer; 132. a carbon rod; 133. a central tube section; 1331. an inner barrel; 134. a central tube; 135. sealing a water end cover; 136. a first adaptor sleeve; 1361. a through hole; 14. an ultrafiltration membrane cartridge; 15. a first seal member; 16. a second adaptor sleeve; 17. a guide sleeve; 20. a water purifier system; 21. a raw water pipe; 211. a water inlet switch valve; 212. a water pump; 22. a waste pipe; 221. a waste water switch valve; 23. a pure water pipe; 231. a one-way valve; 232. a pressure switching valve; 30. a faucet.

Detailed Description

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

As shown in fig. 1 to 4, in one embodiment, a composite filter element 10 is provided, which comprises a filter flask 11, and a front composite filter element 12 and a membrane filter assembly 13 which are sequentially arranged in the filter flask 11 at intervals. As shown in fig. 5 to 7, the membrane filtration assembly 13 includes a membrane filtration layer 131, a carbon rod 132, a central pipe section 133 and a water sealing end cap 135, the carbon rod 132 and the central pipe section 133 are communicated to form a central pipe 134, the membrane filtration layer 131 is sleeved outside the central pipe section 134, and the water sealing end cap 135 is disposed on the central pipe section 134 near an end of the front composite filter element 12. The end surface of the front composite filter element 12 close to the membrane filter assembly 13 is provided with a first adapter sleeve 136, the first adapter sleeve 136 is sleeved outside the membrane filter layer 131, and the first adapter sleeve 136 is provided with a through hole 1361 for leading the front filtered water obtained by filtering the front composite filter element 12 to flow to the membrane filter assembly 13.

According to the composite filter element 10 provided by the scheme, the front composite filter element 12, the membrane type filter layer 131 and the carbon rod 132 are integrated in the filter bottle 11, so that the integration level is improved. And the water circuit layout in the composite filter element 10 is simple while the integration level is improved. Specifically, prefiltered water filtered by the prefilter cartridge 12 enters a gap between the first adapter sleeve 136 and the membrane filter layer 131 through a through hole 1361 in the first adapter sleeve 136. The water sealing end cap 135 is arranged at the end part of the central pipe 134 close to the front composite filter element 12, and the water sealing end cap 135 seals the end of the central pipe 134, so that water entering the gap between the first adapter sleeve 136 and the membrane type filter layer 131 can only enter the membrane type filter layer 131 from a raw water inlet at the end part of the membrane type filter layer 131, and then is filtered by the membrane type filter layer 131 and the carbon rod 132 in sequence to obtain pure water for users to use.

Moreover, the central pipe 134 in the middle of the membrane filter layer 131 is formed by combining the carbon rod 132 and the central pipe section 133, so that the filtering requirement is met, and the material cost is effectively controlled. Thereby reducing the manufacturing cost of the composite filter element 10 as a whole and thus reducing the replacement cost.

Specifically, as shown in fig. 5 to 7, a central pipe 134 in the middle of the membrane filter layer 131 is provided in a form including the carbon rod 132 and the central pipe section 133, and a partial structure of the central pipe 134 is partially replaced with the carbon rod 132. The carbon rods 132 can further filter the water filtered by the membrane filter layer 131, thereby improving the quality of the water. And a filter element can be further arranged in the central pipe section 133, so that the filtering effect is further improved.

For example, in one embodiment, as shown in fig. 2 and 6, the central tube segment 133 has an ultrafiltration membrane cartridge 14 disposed therein. Raw water entering the composite filter element 10 is required to be filtered by the front composite filter element 12, the membrane filter layer 131, the carbon rod 132 and the ultrafiltration membrane filter element 14 in sequence to obtain pure water for users to use.

Of course, as shown in fig. 7, the central pipe section 133 may alternatively be used as a water passage only, and a filter element may not be provided therein.

More specifically, in one embodiment, as shown in fig. 2, 3, 5, 6, and 7, the carbon rod 132 is closer to the first adaptor sleeve 136 relative to the central tube segment 133, and the water-sealing end cap 135 is disposed on an end of the carbon rod 132 distal from the central tube segment 133.

Or, optionally, in another embodiment, the central pipe segment 133 is closer to the first adapter sleeve 136 than the carbon rod 132, and the water sealing end cap 135 is disposed on the end of the central pipe segment 133 away from the carbon rod 132.

Further, in one embodiment, as shown in fig. 6, the carbon rod 132 is closer to the first adaptor sleeve 136 than the central tube segment 133, and the water-sealing end cap 135 is disposed on the end of the carbon rod 132 away from the central tube segment 133. And the ultrafiltration membrane cartridge 14 is arranged in the central pipe section 133. A section of the central pipe segment 133 away from the carbon rod 132 communicates with the pure water port 1113 of the filter flask 11. Therefore, the water filtered by the membrane filter 131 flows from the opening at one end of the central pipe section 133 to the pure water port 1113 after being filtered by the carbon rod 132 and the ultrafiltration membrane filter element 14 in sequence.

More specifically, as shown in fig. 2 and 3, in one embodiment, an end of the central tube segment 133 away from the carbon rod 132 is folded inward to form an inner tube 1331, the inner tube 1331 abuts against an outer peripheral surface of the water outlet end of the ultrafiltration membrane filter element 14, and a first sealing member 15 is disposed between the inner tube 1331 and the water outlet end of the ultrafiltration membrane filter element 14.

The cooperation between the inner barrel 1331 and the ultrafiltration membrane filter element 14 ensures that water entering the central pipe section 133 cannot flow out from a gap between the central pipe section 133 and the ultrafiltration membrane filter element 14, and water filtered by the carbon rod 132 enters the central pipe section 133 and then can flow out from the water outlet end of the ultrafiltration membrane filter element 14 only after being filtered by the ultrafiltration membrane filter element 14, so that water flow can move forward according to a specified water path.

Further, in one embodiment, as shown in fig. 2 and 3, the filter bottle 11 is provided with a raw water port 1111, a pure water port 1113, and a waste water port 1112. A raw water gap 113 is formed between the outer peripheral surface of the front composite filter element 12 and the filter flask 11 at intervals, and the raw water port 1111 is communicated with the raw water gap 113. The water entering the composite filter element 10 from the raw water port 1111 reaches the raw water gap 113 first, and then is filtered from the outer circumference of the front composite filter element 12 toward the central portion. One end of the central pipe fitting 134, which is far away from the front composite filter element 12, is communicated with the pure water port 1113, and a concentrated water outlet of the membrane filter layer 131 is communicated with the waste water port 1112. When filtering, the membrane filter layer 131 forms concentrated water, and the concentrated water is discharged out of the composite filter element 10 from the concentrated water outlet and the waste water port 1112.

Further, in an embodiment, as shown in fig. 2 and fig. 3, the composite filter element 10 further includes a second adapter sleeve 16 and a guide sleeve 17, the second adapter sleeve 16 is sleeved on one end of the membrane filter assembly 13 away from the front composite filter element 12, and a concentrated water outlet of the membrane filter layer 131 is located on an end surface sleeved by the second adapter sleeve 16. The guide sleeve 17 is inserted into the second adapter sleeve 16, the guide sleeve 17 communicates the central pipe 134 with the pure water port 1113, a waste water cavity 115 is formed between the guide sleeve 17 and the second adapter sleeve 16 at intervals, and the waste water cavity 115 is communicated with the waste water port 1112. Concentrated water filtered by the membrane filter layer 131 is discharged into the wastewater cavity 115 from the concentrated water outlet, and then is discharged out of the composite filter element 10 from the wastewater outlet 1112.

More specifically, in one embodiment, as shown in fig. 2 and 3, the raw water port 1111, the pure water port 1113 and the waste water port 1112 are all disposed on the end surface of the filter flask 11 away from the advanced composite filter element 12. A water passing gap 114 is formed between the outer peripheral surface of the membrane type filtering assembly 13 and the filter flask 11 at an interval, a gap is formed between the first adapter sleeve 136 and the filter flask 11, so that the water passing gap 114 is communicated with the raw water gap 113, and a gap is formed between the second adapter sleeve 16 and the filter flask 11, so that the raw water port 1111 is communicated with the water passing gap 114.

So that the raw water entering the composite filter element 10 from the raw water port 1111 passes through the second adapter sleeve 16 and then enters the water passing gap 114. The raw water entering the water passing gap 114 passes through the first adaptor sleeve 136 and then enters the raw water gap 113.

Further, as shown in fig. 2 and 3, the pre-composite filter element 12 and the membrane filter assembly 13 are sequentially arranged in the axial direction of the filter flask 11, the first adapter sleeve 136 divides the space in the filter flask 11 into a first filter chamber and a second filter chamber, the pre-composite filter element 12 is located in the filter chamber far from the raw water port 1111, the pure water port 1113 and the waste water port 1112, and the membrane filter assembly 13 is located in the other filter chamber. For example, if the filter chamber far from the end face where the raw water port 1111, the pure water port 1113 and the waste water port 1112 are located is a first filter chamber, the pre-composite filter element 12 is located in the first filter chamber, and the membrane filter assembly 13 is located in a second filter chamber.

Further, the outer circumferential surface of the first adapter sleeve 136 is provided with a water passing groove, so that a gap is formed between the first adapter sleeve 136 and the filter bottle 11, and the water passing groove is communicated with the raw water gap 113 and the water passing gap 114.

Further, as shown in fig. 1 to 4, the filter bottle 11 includes a bottle body 111 and a bottle cap 112, the bottle cap 112 is disposed at an opening of the bottle body 111, and the raw water port 1111, the pure water port 1113 and the waste water port 1112 are disposed on an end surface of the bottle body 111 far from the bottle cap 112.

More specifically, in one embodiment, as shown in fig. 8 and 9, the pre-composite filter element 12 includes a paper folding filter element 121 and a carbon rod filter element 122, the paper folding filter element 121 is sleeved outside the carbon rod filter element 122, and the through hole 1361 is communicated with the middle channel of the carbon rod filter element 122.

The water filtered in the pre-composite filter element 12 reaches the middle passage of the carbon rod filter element 122 and then flows from the through hole 1361 to the membrane filter assembly 13.

Further specifically, in one embodiment, the membrane filtration layer 131 includes a reverse osmosis membrane. The reverse osmosis membrane utilizes the reverse osmosis function to filter and purify water.

Further, in another embodiment, a water purifier system 20 is provided, which comprises the composite filter element 10 described above. By adopting the composite filter element 10 in any one of the embodiments, the cost for replacing the filter element is effectively reduced.

Further, as shown in fig. 10, in an embodiment, the raw water port 1111 of the filter flask 11 is provided with a raw water pipe 21, the raw water pipe 21 is provided with a water inlet switch valve 211 and a water pump 212 in sequence, and the water inlet switch valve 211 is located at an upstream of the water pump 212. The waste water port 1112 of the filter flask 11 is provided with a waste water pipe 22, and the waste water pipe 22 is provided with a waste water switch valve 221. The pure water port 1113 of the filter bottle 11 is provided with a pure water pipe 23, and the pure water pipe 23 is used for communicating with a user tap 30. The pure water pipe 23 is sequentially provided with a one-way valve 231 and a pressure switch valve 232, and the one-way valve 231 is located at the upstream of the pressure switch valve 232.

Specifically, the water inlet switching valve 211, the waste water switching valve 221, and the pressure switching valve 232 may be solenoid valves. When the water tap 30 is opened and the pressure switch valve 232 detects that the pressure is reduced to a certain value, the water inlet switch valve 211 and the wastewater switch valve 221 are both opened, the water purifier system 20 operates to provide pure water filtered by the composite filter element 10 for a user.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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

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

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

Claims (11)

1. The utility model provides a composite filter element, its characterized in that includes the filter flask and sets up at interval in proper order leading composite filter element and membrane type filtering component in the filter flask, membrane type filtering component includes membrane type filter layer, carbon-point, central pipeline section and seals the water end cover, the carbon-point with central pipeline section intercommunication forms central pipe fitting, the membrane type filter layer cover is in outside the central pipe fitting, it sets up to seal the water end cover be close to on the central pipe fitting leading composite filter element's tip, be close to on the leading composite filter element membrane type filtering component's terminal surface is equipped with first adapter sleeve, first adapter sleeve is in outside the membrane type filtering layer, be equipped with the through-hole on the first adapter sleeve, be used for making leading composite filter element filters the leading drainage flow direction of obtaining filtering component.

2. The composite filter element of claim 1, wherein the carbon rod is closer to the first adapter sleeve than to the central tube segment, and the water-sealing end cap is disposed on an end of the carbon rod distal from the central tube segment.

3. The composite filter element of claim 1 or 2, wherein an ultrafiltration membrane filter element is disposed in the central tube section.

4. The composite filter element according to claim 3, wherein the end of the central tube section away from the carbon rod is folded inwards to form an inner tube, the inner tube is tightly abutted against the outer peripheral surface of the water outlet end of the ultrafiltration membrane filter element, and a first sealing member is arranged between the inner tube and the water outlet end of the ultrafiltration membrane filter element.

5. The composite filter element according to claim 1 or 2, wherein the filter flask is provided with a raw water gap, a pure water gap and a waste water gap, a raw water gap is formed between the outer peripheral surface of the front composite filter element and the filter flask at an interval, the raw water gap is communicated with the raw water gap, one end of the central pipe piece far away from the front composite filter element is communicated with the pure water gap, and a concentrated water outlet of the membrane filter layer is communicated with the waste water gap.

6. The composite filter element according to claim 5, further comprising a second adapter sleeve and a guide sleeve, wherein the second adapter sleeve is sleeved on one end of the membrane filtering component far away from the front composite filter element, a concentrated water outlet of the membrane filtering layer is positioned on an end surface sleeved with the second adapter sleeve, the guide sleeve is inserted into the second adapter sleeve, the guide sleeve is communicated with the central pipe fitting and the pure water port, a waste water cavity is formed between the guide sleeve and the second adapter sleeve at intervals, and the waste water cavity is communicated with the waste water port.

7. The composite filter element according to claim 6, wherein the raw water port, the pure water port and the waste water port are all arranged on the end face of the filter flask far away from the front composite filter element, a water passing gap is formed between the outer peripheral surface of the membrane type filter assembly and the filter flask at intervals, a gap is formed between the first adapter sleeve and the filter flask, so that the water passing gap is communicated with the raw water gap, and a gap is formed between the second adapter sleeve and the filter flask, so that the raw water port is communicated with the water passing gap.

8. The composite filter element according to claim 1 or 2, wherein the front composite filter element comprises a paper folding filter element and a carbon rod filter element, the paper folding filter element is sleeved outside the carbon rod filter element, and the through hole is communicated with a middle channel of the carbon rod filter element.

9. The composite filter cartridge of claim 1 or 2, wherein the membrane filtration layer comprises a reverse osmosis membrane.

10. A water purification system comprising a composite filter element according to any one of claims 1 to 9.

11. The water purification system as claimed in claim 10, wherein the raw water port of the filter bottle is provided with a raw water pipe, the waste water port of the filter bottle is provided with a waste water pipe, the pure water port of the filter bottle is provided with a pure water pipe, the pure water pipe is used for communicating with a user faucet, the raw water pipe is provided with a water inlet switch valve and a water pump in sequence, the water inlet switch valve is located upstream of the water pump, the waste water pipe is provided with a waste water switch valve, the pure water pipe is provided with a check valve and a pressure switch valve, and the check valve is located upstream of the pressure switch valve.

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