CN220376403U - Composite filter element of water purifying equipment - Google Patents

Abstract

The utility model discloses a composite filter element of water purifying equipment, which comprises: a filter flask; the central tube is arranged in the filter flask; a first filter assembly disposed within the center tube; a second filter assembly, wherein an installation space is formed between the inner wall of the filter flask and the outer wall of the central tube, and the second filter assembly is arranged in the installation space; the first filter assembly comprises a rear filter element and a partition member, wherein the rear filter element is arranged in the partition member, and the partition member is arranged in the central tube. According to the technical scheme, the rear filter element is arranged in the partition piece, and the partition piece is arranged in the central tube, so that direct impact of water flow filtered by the reverse osmosis filter element on the rear filter element is prevented, the possibility of damage to the structure of the rear filter element is further reduced, and the service life of the rear filter element is guaranteed.

Description

Composite filter element of water purifying equipment

Technical Field

The utility model relates to the field of water purifying equipment, in particular to a composite filter element of water purifying equipment.

Background

The water purifying equipment is used in producing clean water and is used in drinking, chemical, medical, cultivation, planting, food, beverage, etc.

In the existing water purifying equipment, a filter element is commonly used for filtering water, and in order to reduce the whole volume of the water purifying equipment, filter elements with different functions are integrated and combined into a whole, and the used composite filter element is generally a 3-level or 4-level filter element; the composite filter element generally comprises a front filter element for filtering large particles such as floccules, a reverse osmosis filter element for reducing the concentration of salt ions in water and filtering microorganisms, and a rear filter element for improving the taste of purified water.

The water filtered by the front filter element enters the reverse osmosis filter element and is pressurized generally, so that the water outlet efficiency of the reverse osmosis filter element is guaranteed, the water filtered by the reverse osmosis filter element still has higher pressure, and the water pressure returns to impact the rear filter element, so that the possibility of damage to the structure of the rear filter element is increased, and the service life of the rear filter element is shortened.

Disclosure of Invention

The utility model mainly aims to provide a composite filter element of water purifying equipment, which aims to reduce the impact of water flow on a rear filter element.

In order to achieve the above object, the present utility model provides a composite filter element of a water purifying apparatus, comprising:

a filter flask;

the central tube is arranged in the filter flask;

a first filter assembly disposed within the center tube;

a second filter assembly, wherein an installation space is formed between the inner wall of the filter flask and the outer wall of the central tube, and the second filter assembly is arranged in the installation space;

the first filter assembly comprises a rear filter element and a partition member, wherein the rear filter element is arranged in the partition member, and the partition member is arranged in the central tube.

Optionally/in an embodiment, a filter bottle cap is provided on the filter bottle, the first filter component is detachably disposed in the central tube, the first filter component further includes a filter core cap and a pre-filter core, a clamping groove for embedding the filter core cap is provided on the filter bottle cap, the filter core cap is connected with the top end of the pre-filter core, and the bottom end of the pre-filter core is disposed on the top end of the partition member.

Alternatively/in an embodiment, the length of the pre-filter element is greater than the post-filter element.

Optionally/in an embodiment, a first water inlet port and a first water outlet port are formed on the filter element cover, and water flows enter the central tube through the first water inlet port, is filtered by the pre-filter element, is discharged from the first water outlet port, and enters the second filter assembly.

Optionally/in an embodiment, the post filter element is used for filtering the water filtered by the second filter element, a second water outlet through hole is further formed in the filter element cover, a water outlet pipe communicated with the inside of the partition element is arranged on the top end of the partition element, and the water outlet pipe penetrates through the pre filter element and is communicated with the second water outlet through hole.

Optionally/in an embodiment, the partition member includes a partition plate and a barrel, the partition plate is disposed on the top of the barrel, the pre-filter element is disposed on a surface of the partition plate facing away from the barrel, and a limiting ring for limiting the pre-filter element is disposed on the periphery of the partition plate.

Optionally/in an embodiment, a sealing groove is formed on the end portion of the cylinder body, provided with the partition plate, and a plurality of sealing rings are arranged in the sealing groove.

Optionally/in an embodiment, the central tube is provided with a plurality of first water passing holes, the barrel is provided with a plurality of second water passing holes, and water filtered by the second filtering component enters the separator through the first water passing holes and the second water passing holes.

Optionally/in an embodiment, a limiting pipe is formed on the partition plate in a protruding manner into the cylinder body, the limiting pipe is communicated with the water outlet pipe, and the limiting pipe and the cylinder body jointly limit the rear filter element.

Alternatively/in an embodiment, the bottom of the partition is provided with a lower end cap for securing the post-filter element.

Alternatively/in an embodiment, an embedding part is provided on the outer periphery of the lower end cover, and the lower end cover is embedded into the cylinder body.

Optionally/in an embodiment, a plurality of interference protrusions are further disposed on the outer periphery of the embedding portion at uniform intervals, and interference grooves for embedding the interference protrusions are formed in the inner wall of the barrel.

Optionally/in an embodiment, a limiting part is formed on the lower end cover protruding into the cylinder body, and the limiting part and the embedded part limit the rear filter element together.

Optionally/in an embodiment, a limiting protrusion is formed on the partition plate protruding into the barrel, and the limiting protrusion and the barrel jointly limit the rear filter element.

According to the technical scheme, the rear filter element is arranged in the partition piece, and the partition piece is arranged in the central tube, so that direct impact of water flow filtered by the reverse osmosis filter element on the rear filter element is prevented, the possibility of damage to the structure of the rear filter element is further reduced, and the service life of the rear filter element is guaranteed.

Drawings

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

FIG. 1 is a schematic diagram of the overall structure of a composite filter element of a water purification apparatus of the present utility model;

FIG. 2 is an exploded view of the overall structure of the composite filter element of the water purification apparatus of the present utility model;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic diagram of the overall structure of the filter cap;

FIG. 5 is an exploded view of the overall structure of the second filter assembly;

FIG. 6 is a schematic cross-sectional view of a composite filter element of the water purification apparatus of the present utility model;

FIG. 7 is an enlarged view of portion B of FIG. 6;

FIG. 8 is an enlarged view of portion C of FIG. 6;

FIG. 9 is a schematic diagram of the mating relationship between the lower end cap and the separator of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a composite filter element of water purifying equipment, which can reduce the impact of water filtered by a reverse osmosis filter element 310 on a rear filter element 222 in the composite filter element, thereby reducing the possibility of damage to the rear filter element 222 and guaranteeing the service life of the rear filter element 222.

The composite filter element provided by the utility model comprises a filter flask 100, a first filter assembly 200, a second filter assembly 300 and a central tube 340; wherein, the filter flask 100 is directly installed in the water purifying apparatus or is disposed outside the water purifying apparatus to be connected with the water purifying apparatus, the central tube 340 is disposed in the filter flask 100, so that an installation space is formed between the inner wall of the filter flask 100 and the outer wall of the central tube 340, and the second filter assembly 300 is disposed in the installation space of the filter flask 100; the second filter 300 filters solutes such as salt ions in the water, thereby reducing the concentration of the solutes such as salt ions in the water; the first filter assembly 200 is detachably installed in the central tube 340, and filters impurities contained in the water and/or improves the taste of the water.

In the present embodiment, the first filter assembly 200 includes a post-filter 222, i.e., the use of the first filter assembly 200 includes filtering the purified water filtered by the second filter assembly 300 for improving the drinking taste of the purified water.

Specifically, the central tube 340 is coaxially disposed in the filter flask 100, the top end of the filter flask 100 is provided with a filter flask cap 410, the second filter assembly 300 includes a reverse osmosis filter element 310, and the reverse osmosis filter element 310 is disposed in an installation space formed between the inner wall of the filter flask 100 and the outer wall of the central tube 340; in order to fix the reverse osmosis filter element 310 in the filter flask 100, the second filter assembly 300 further comprises a reverse osmosis top cover 320 and a reverse osmosis bottom cover 330, wherein the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330 are respectively arranged at the top and the bottom of the reverse osmosis filter element 310, and the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330 are respectively provided with a reverse osmosis filter element 310 groove for embedding the end part of the reverse osmosis filter element 310; thus, reverse osmosis top cap 320 and reverse osmosis bottom cap 330 cooperate to secure reverse osmosis cartridge 310 within filter flask 100; and bottle cap 410 is used to provide a seal for bottle 100 to ensure proper operation of reverse osmosis cartridge 310.

The first filter assembly 200 is disposed in the center tube 340; specifically, the center tube 340 is used to provide a receiving space for the first filter assembly 200, and the center tube 340 will partition the space within the filter flask 100; a plurality of first water holes 340a are formed in the central tube 340 in an array manner, so that the central tube 340 can block the first filter assembly 200 from being in direct contact with the reverse osmosis filter element 310, and further can primarily block the direct impact of water flow on the first filter assembly 200, and the overall service life of the first filter assembly 200 is guaranteed. Accordingly, when water is filtered, water flows from the inner wall of the filter flask 100 to the outer wall of the center tube 340, so that water flows through the reverse osmosis filter element 310, and the concentration of solutes such as salt ions in water is reduced.

It should be noted that, the filter bottle cap 410 is provided with a reverse osmosis wastewater cavity, and the reverse osmosis wastewater cavity is communicated with the installation space between the filter bottle 100 and the central tube 340; the reverse osmosis filter element 310 is tightly attached to the central tube 340, so that only a part of water passes through the reverse osmosis filter element 310 under the action of pressure after entering the reverse osmosis filter element 310, and the rest part of water cannot completely pass through the reverse osmosis filter element 310, passes through the reverse osmosis top cover 320 and then exits the filter flask 100 through the reverse osmosis waste water cavity; the reverse osmosis filtration is based on that solutes such as salt ions and water molecules pass through the reverse osmosis filter membrane at different rates so as to separate the solutes in the water, so that most of impurity solutes such as salt ions can be taken away by the water which does not pass through the reverse osmosis filter element 310 and enters the reverse osmosis wastewater cavity, and the integral filtration effect of the second filter assembly 300 is further ensured.

In the present embodiment, the first filter assembly 200 includes a post-filter element 222 and a separator 280, the post-filter element 222 being disposed in the separator 280; the partition 280 is provided with a plurality of second water passing holes 280a, when water flow is filtered by the reverse osmosis filter element 310, the water flow can enter the partition 280 through the first water passing holes 340a and the second water passing holes 280a, and then the water flow can flow through the rear filter element 222 to be filtered; when the water flow is pressurized by the booster pump before flowing through the reverse osmosis filter element 310, that is, after the water flow is filtered by the pre-filter element 221, the water flow pressure is increased to pass through the reverse osmosis filter element 310, and the water flow still has higher pressure after passing through the reverse osmosis filter element 310, the central tube 340 can block a part of the water flow pressure, but the post-filter element 222 is still possibly damaged due to the too high water flow pressure, so that the impact of the water flow on the post-filter element 222 is further reduced by the partition 280, and the structural stability and the service life of the post-filter element 222 are further improved.

Accordingly, the first water passing holes 340a and the second water passing holes 280a are in one-to-one correspondence, so that water can smoothly enter the separator 280 through the wall of the central tube 340 and the barrel 282 of the separator 280; when the water flow is filtered by the post-filter 222, the top end of the partition member 280 is provided with the water outlet pipe 230, one end of the water outlet pipe 230 is communicated with the partition member 280, the post-filter 222 is hollow, and the water flow flows from the outside of the post-filter 222 to the inside of the post-filter 222, so that the water flow can be discharged outwards through the water outlet pipe 230 after being filtered by the post-filter 222.

In addition, in this embodiment, the first filter assembly 200 is detachably disposed in the central tube 340, the first filter assembly 200 further includes a filter cap 210 and a pre-filter element 221, the filter cap 410 is provided with a clamping groove 418 into which the filter cap 210 is inserted, specifically, the filter cap 210 is connected to the top end of the pre-filter element 221, and the bottom end of the pre-filter element 221 is disposed on the top end of the partition 280. The provision of the catch groove 418 allows the first filter assembly 200 as a whole to be inserted directly into the center tube 340 or removed directly from the center tube 340. Thereby facilitating removal of the first filter assembly 200; the filter bottle cap 410 is provided with a reverse osmosis water inlet cavity, the filter core cap 210 is provided with a second water outlet through hole 213, the pre-filter core 221 is arranged in a hollow mode, the water outlet pipe 230 passes through the pre-filter core 221 and is communicated with the second water outlet through hole 213, water flow enters the filter bottle 100 through the reverse osmosis water inlet cavity, is filtered through the second filter assembly 300, enters the post-filter core 222 through the first water outlet hole 340a, and is discharged through the second water outlet through hole 213.

In order to match the detachable first filter assembly 200, the reverse osmosis top cover 320 is provided with a through hole 321 for the central tube 340 to extend, so that the first filter assembly 200 can be directly taken out of the central tube 340 when the first filter assembly 200 is detached.

In order to further improve the structural strength of the post-filter element 222, the length of the pre-filter element 221 is greater than that of the post-filter element 222, so that when the first filter assembly 200 is integrally installed in the central tube 340, the length of the central tube 340 occupied by the post-filter element 222 is smaller than that occupied by the pre-filter element 221, thereby shortening the length of the post-filter element 222, improving the structural strength of the post-filter element 222 in a phase-changing manner, and further reducing the possibility that the post-filter element 222 can reach the service life prematurely due to structural damage.

In addition, due to the characteristics of the reverse osmosis filter element 310, the volume of water to be filtered of the post-filter element 222 is smaller than the volume of water to be filtered of the pre-filter element 221, so that the length difference between the post-filter element 222 and the pre-filter element 221 can be matched with the difference of the volumes of water to be filtered.

It should be noted that, in this embodiment, the first filter assembly 200 further includes an upper end cover 250 and a lower end cover 260, the post-filter element 222 is disposed in the central tube 340, the upper end cover 250 is disposed on the top end of the pre-filter element 221, the filter element cover 210 is in sealing connection with the upper end cover 250, and the lower end cover 260 is disposed on the bottom end of the post-filter element 222; the filter element cover 210 is provided with a filter element handle 270; thus, when the first filter assembly 200 needs to be replaced, the user can lift the filter element handle 270 to lift the filter element cover 210, and the filter element cover 210 will lift the upper end cover 250, the pre-filter element 221, the post-filter element 222 and the lower end cover 260, so that the first filter assembly 200 is lifted as a whole; thereby completing the replacement of the first filter assembly 200.

It should be noted that, the end of the water outlet pipe 230 is connected with the upper end cover 250 in a sealing manner, so that the partition member 280 is indirectly connected with the upper end cover 250 through the water outlet pipe 230, and when the filter element cover 210 is lifted, the filter element cover 210 drives the upper end cover 250 and the partition member 280 to be lifted at the same time, that is, the pre-filter element 221 and the post-filter element 222 are lifted at the same time.

In this embodiment, the bottom end of the partition 280 is an opening of the partition 280, and the lower end cover 260 is disposed on the bottom end of the partition 280, so that the lower end cover 260 can limit the rear filter element 222; and during installation, the post-filter element 222 can be placed into the separator 280 first, and then the separator 280 is closed by the lower end cap 260; specifically, the lower end cover 260 protrudes toward the inside of the partition 280 to form a limiting part, and the limiting part and the inner wall of the partition 280 jointly limit the rear filter element 222; the partition 280 includes a partition plate 281 and a barrel 282, the partition plate 281 is disposed on the top of the barrel 282, the pre-filter 221 is disposed on the surface of the partition plate 281 facing away from the barrel 282, and a limit ring 281a for limiting the pre-filter 221 is disposed on the outer periphery of the partition plate 281 to improve the stability of the pre-filter 221; the spacing pipe 283 is formed on the partition plate 281 protruding inwards, and the spacing pipe 283 is communicated with the water outlet pipe 230, and the spacing pipe 283 also cooperates with the inner wall of the partition member 280 to limit the post-filter element 222, so that the spacing part, the spacing pipe 283 and the inner wall of the partition member 280 cooperate to limit the post-filter element 222, the movable range of the post-filter element 222 is reduced, the structural strength of the post-filter element 222 is further improved, and the possibility that the post-filter element 222 is damaged due to water impact is reduced.

The lower end cap 260 has an embedded portion 262 on its outer periphery, specifically, the embedded portion 262 is integrally formed on the lower end cap 260, and the embedded portion 262 is bent toward the inside of the barrel 282; generally, the lower end cover 260 is made of plastic material, and the diameter of the cross section of the embedded portion 262 is slightly larger than that of the cross section of the barrel 282 in a natural state, so that when the lower end cover 260 is installed in the barrel 282, the embedded portion 262 can be abutted against the barrel 282 by utilizing deformation of the embedded portion 262, and the embedded portion 262 can fix the lower end cover 260 in the barrel 282, and further the rear filter element 222 is fixed in the barrel 282; further, a plurality of interference protrusions 263 are uniformly arranged on the outer circumference of the embedding portion 262 at intervals, and interference grooves 282a for embedding the interference protrusions 263 are formed on the inner wall of the barrel 282; in the present embodiment, the number of the interference protrusions 263 is 4, the 4 interference protrusions 263 are uniformly distributed on the outer circumference of the lower end cap 260, and the interference protrusions 263 can be embedded into the interference grooves 282a by using the deformation of the embedded portion 262; it should be noted that, although the lower end cap 260 can be fixed in the barrel 282 by the arrangement of the embedding portion 262, the installation difficulty of the lower end cap 260 is increased, and the matching of the interference protrusion 263 and the interference groove 282a can realize alignment of the lower end cap 260 in the installation process, and under the condition that the fixing effect of the lower end cap 260 is ensured by the matching of the interference protrusion 263 and the interference groove 282a, the diameter difference between the embedding portion 262 and the barrel 282 can be further reduced, and the installation difficulty of the lower end cap 260 is further reduced, so that the lower end cap 260 can be easily embedded in the barrel 282 by the arrangement of the interference protrusion 263 and the opening of the interference groove 282 a.

The provision of the partition 280 simultaneously partitions the pre-cartridge 221 and the post-cartridge 222 such that the water flow between the pre-cartridge 221 and the post-cartridge 222 does not interfere with each other; correspondingly, in order to further ensure the separation of the front filter element 221 and the rear filter element 222, a sealing groove 284 is formed in the peripheral wall of the top of the barrel 282, and a plurality of sealing rings 285 are arranged in the sealing groove 284, so that the possibility of water flow interference between the front filter element 221 and the rear filter element 222 is further reduced, and the filtering effect is further ensured.

It should be noted that, the filter element cover 210 is provided with a plurality of water gaps including a second water outlet 213, a first water inlet 211, a first water outlet 212, and the like; the filter bottle cap 410 is provided with a plurality of water channels, two of the water channels are respectively communicated with the reverse osmosis water inlet cavity and the reverse osmosis wastewater cavity, water gaps are in one-to-one correspondence with the water channels, and the number of the water channels is greater than or equal to that of the water gaps; the longitudinal sectional area of the water channel is smaller than that of the water gap, so that a certain height difference is allowed to exist between the water gap and the water channel when the first filter assembly 200 is detached or installed; the water gap is also provided with a flexible abutting piece 500, and the flexible abutting piece 500 can abut against the filter bottle cap 410; specifically, since the first filter assembly 200 is detachable with respect to the filter flask 100, and the waterway between the filter flask cover 410 and the filter flask cover 210 needs to be communicated, a water gap and a waterway need to be opened, so that the integration of the composite filter element is facilitated; and there is certain movable range between filter flask lid 410 and filter core lid 210, therefore need flexible conflict piece 500 to provide sealedly between mouth of a river and the water course, and the longitudinal cross section area of water course is continuous to be less than the mouth of a river, when making filter core lid 210 activity in certain range, mouth of a river and water course still can correspond, and when filter core lid 210 imbeds to joint groove 418 in, flexible conflict piece 500 can produce deformation, and the deformation of flexible conflict piece 500 can cooperate the difference in height that exists between water course and the mouth of a river, and flexible conflict piece 500 also can provide sealedly between mouth of a river and the water course when deformation.

Of the water gaps, the first water inlet through hole 211 and the first water outlet through hole 212 are respectively used for leading in raw water (water to be filtered) to the front filter element 221 and leading out water filtered by the front filter element 221, and the second water outlet through hole 213 is communicated with the water outlet pipe 230, so that the second water outlet through hole 213 can lead out water filtered by the rear filter element 222, namely purified water; and one of the water channels is communicated with the first water inlet port 211, the first water outlet port 212, the second water outlet port 213, the reverse osmosis water inlet cavity and the reverse osmosis water outlet cavity respectively to form an integral flow path.

Specifically, raw water enters from the first water inlet port 211, is filtered by the pre-filter element 221, and is discharged through the first water outlet port 212 at the hollow part of the pre-filter element 221 to form first purified water, and the first purified water enters into the filter flask 100 through the reverse osmosis water inlet cavity and is filtered by the second filter assembly 300; the water filtered by the second filtering assembly 300 is second purified water, the second purified water enters the partition 280 through the first water passing hole 340a, namely the second water passing hole 280a, and then the second purified water is filtered by the rear filter element 222 to form pure water, and the pure water passes through the hollow part of the rear filter element 222 and then is discharged out of the filter flask 100 through the limiting pipe 283 and the water outlet pipe 230 to the second water outlet port 213; the pure water discharged from the filter flask 100 is supplied to the user.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (14)

1. A composite filter element of a water purification apparatus, comprising:

a filter flask;

the central tube is arranged in the filter flask;

the first filter assembly is detachably arranged in the central tube;

a second filter assembly, wherein an installation space is formed between the inner wall of the filter flask and the outer wall of the central tube, and the second filter assembly is arranged in the installation space;

the first filter component comprises a rear filter element and a partition piece, wherein the rear filter element is arranged in the partition piece, and the partition piece is detachably arranged in the central tube.

2. The composite filter element of claim 1, wherein a filter cap is provided on the filter flask, the first filter assembly is detachably disposed in the central tube, the first filter assembly further comprises a filter cap and a pre-filter element, a clamping groove for embedding the filter cap is provided on the filter cap, the filter cap is connected with the top end of the pre-filter element, and the bottom end of the pre-filter element is disposed on the top end of the partition.

3. The composite filter element of a water purification apparatus of claim 2, wherein the pre-filter element has a length greater than the post-filter element.

4. A composite filter element of a water purification apparatus according to claim 3, wherein a first water inlet port and a first water outlet port are formed in the filter element cover, and water flow enters the central tube through the first water inlet port, is filtered by the pre-filter element, and is discharged from the first water outlet port to enter the second filter assembly.

5. The composite filter element of claim 4, wherein the post filter element is used for filtering water filtered by the second filter element, a second water outlet through hole is further formed in the filter element cover, a water outlet pipe communicated with the inside of the partition element is arranged on the top end of the partition element, and the water outlet pipe penetrates through the pre filter element and is communicated with the second water outlet through hole.

6. The composite filter element of claim 5, wherein the separator comprises a separator plate and a cartridge body, the separator plate is disposed on the top of the cartridge body, the pre-filter element is disposed on a surface of the separator plate facing away from the cartridge body, and a limiting ring for limiting the pre-filter element is disposed on the periphery of the separator plate.

7. The composite filter element of the water purification device according to claim 6, wherein a sealing groove is formed in the end portion of the cylinder body, on which the partition plate is arranged, and a plurality of sealing rings are arranged in the sealing groove.

8. The composite filter element of claim 6, wherein the central tube is provided with a plurality of first water passing holes, the cartridge body is provided with a plurality of second water passing holes, and water filtered by the second filter assembly enters the separator through the first water passing holes and the second water passing holes.

9. The composite filter element of claim 6, wherein a limiting tube is formed on the partition plate protruding into the cartridge body, the limiting tube is communicated with the water outlet tube, and the limiting tube and the cartridge body limit the rear filter element together.

10. The composite filter element of the water purification apparatus according to claim 6, wherein a bottom of the partition is provided with a lower end cap for fixing the rear filter element.

11. The composite filter element of claim 10, wherein the lower end cap has an insert portion on an outer periphery thereof, and the lower end cap is inserted into the cartridge body.

12. The composite filter element of claim 11, wherein a plurality of interference protrusions are uniformly spaced on the outer circumference of the embedding portion, and interference grooves into which the interference protrusions are embedded are formed in the inner wall of the cartridge body.

13. The composite filter element of claim 12, wherein the lower end cap is formed with a limiting portion protruding into the cartridge body, and the limiting portion and the embedded portion cooperate to limit the rear filter element.

14. The composite filter element of claim 6, wherein the partition plate is provided with a limiting protrusion protruding inwards of the barrel, and the limiting protrusion and the barrel limit the rear filter element together.