CN209307052U - Composite filter element component - Google Patents

Abstract

The utility model discloses a composite filter element assembly, which comprises: a housing, a first filter group, an inner pipe, a second filter group, a water outlet pipe, and a rubber retaining ring; the housing is provided with a tap water inlet, a purified water outlet, a purified water Inlet and pure water outlet; the first filter group is set in the housing, and the first filter group defines a built-in filter material installation cavity; the inner tube is detachably set in the built-in filter material installation cavity; the second filter group is set inside In the pipe; one end of the outlet pipe is connected to the pure water outlet, and the other end of the outlet pipe penetrates the inner pipe along the axial direction of the inner pipe, then extends out of the inner pipe and extends into the built-in filter material installation cavity, wherein the outer peripheral wall of the outlet pipe is provided with There is an end plate, and the second filter group is glued to the end plate; the rubber retaining ring is overlaid on the water outlet pipe, and the outer peripheral edge of the rubber retaining ring is blocked on the circumferential outside of the end plate. The composite filter element assembly of the embodiment of the utility model has the advantages of high integration degree, small volume, large flux, and the adhesive place is not easy to overflow the glue. By separately processing the rubber retaining ring and the water outlet pipe, the processing difficulty of the water outlet pipe is reduced.

Description

Composite filter element

technical field

The utility model belongs to the technical field of water purification, in particular to a composite filter element assembly.

Background technique

The tap water transported from urban waterworks to users usually contains a certain amount of salt ions, metal substances, chlorides, microorganisms, sediment and other substances. In order to improve the quality of drinking water, more and more families choose to install water purifiers on the outlet pipes of tap water. The water purifiers have filter elements with multiple functions to remove different types of harmful substances in tap water.

Usually, the existing water purifier filter elements are generally 3 to 4 grades, and some manufacturers' water purifier filter elements are double-core. In order to improve the filtering effect of the composite filter element assembly, a variety of filter element assemblies are usually arranged in the water purifier. The inlet and outlet ports between each filter element assembly are connected in series in sequence, and the two sides of different filter elements form a water inlet cavity and an outlet cavity respectively. In order to achieve high-quality drinking water, it is often necessary to connect three-stage and four-stage filter elements in series. The water outlets and water inlets between different filter elements need to be connected by external pipes, which makes the composite filter element assembly piping system complicated. Water purifiers The whole machine takes up a lot of space, and it is inconvenient to install and replace the filter element. In addition, when an adhesive structure is used in the composite filter element assembly, the glue between the filter element and the end cover is easy to overflow, even if a rubber blocking member is added, the rubber blocking member is easy to shift; or, the parts with the rubber blocking member are not easy to process and manufacture .

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. For this reason, the utility model proposes a composite filter element assembly, which has small volume, good filtering effect, is not easy to overflow glue, and is easy to process.

A composite filter element assembly according to an embodiment of the present invention, comprising: a casing, on which a tap water inlet, a purified water outlet, a purified water inlet, and a pure water outlet are arranged; a first filter group, the first filter The group is set in the housing, and the first filter group defines a built-in filter material installation cavity; the inner tube is detachably arranged in the built-in filter material installation cavity; the second filter group, The second filter group is arranged in the inner pipe; the water outlet pipe, one end of the water outlet pipe is connected to the pure water outlet, and the other end of the water outlet pipe passes through the inner pipe along the axial direction of the inner pipe. , extend the inner pipe and extend into the built-in filter material installation cavity, wherein an end plate is provided on the outer peripheral wall of the outlet pipe, and the second filter group is glued to the end plate; A rubber ring, the rubber blocking ring is overlaid on the water outlet pipe, and the outer periphery of the rubber blocking ring blocks the circumferential outer side of the end plate.

According to the composite filter element assembly of the embodiment of the utility model, the outlet pipe is provided with an end plate, and the second filter group and the end plate are glued together. On the one hand, the end plate can provide support for the second filter group, and on the other hand, the glue A good seal is formed between the bonded end plate and the second filter group, so that water flows of different water quality on both sides of the second filter group are not easy to cross flow at the bottom. The rubber retaining ring is arranged at the end plate of the water outlet pipe, which reduces the glue overflow phenomenon that may occur when the second filter group is glued to the end plate. The rubber retaining ring and the water outlet pipe fit together, that is, the water outlet pipe and the rubber retaining ring are processed separately, and the processing difficulty of the water outlet pipe is greatly reduced. The second filter group is set in the inner tube, and the inner tube is set in the first filter group, that is to say, the first filter group, the inner tube and the second filter group are nested in sequence, so that the inner tube of the first filter group can be fully utilized. space, and use the inner tube to separate the first filter group and the second filter group and compound them in the housing. The original space of one filter tube accommodates two filter tubes, which saves the space of the first filter group and the second filter group. take up space. Moreover, the detachable inner tube is easy to assemble, which provides convenience for the assembly of the first filter group.

According to the composite filter element assembly according to one embodiment of the present invention, the second filter group is arranged around the outlet pipe, the end plate is formed as an annular plate and connected to the end surface of the second filter group, and the rubber retaining The ring includes: a connecting ring and a sealing ring, the sealing ring is cylindrical and sleeved on the outside of the second filter group and the end plate, and the connecting ring is away from the second filter group from the sealing ring One end edge extends radially inward.

According to an optional embodiment of the present utility model, a locking protrusion is provided on the end plate, and a locking hole matching the locking protrusion is provided on the rubber retaining ring.

According to an optional embodiment of the present utility model, the water outlet pipe is an integral injection molded part, and the end plate is integrally injection molded on the water outlet pipe.

According to the composite filter element assembly in one embodiment of the present invention, a third filter group is further provided in the first filter group, and a water outlet chamber is formed in the third filter group, and the water outlet chamber communicates with the water outlet pipe.

According to the composite filter element assembly according to one embodiment of the present invention, the outer wall of the first filter group and the inner wall of the housing define a first water purification chamber communicating with the water purification inlet; the inner wall of the first filter group A pure water cavity is defined with the outer wall of the inner tube; the inner wall of the inner tube and the outer wall of the second filter group define a tap water cavity communicating with the tap water inlet; The second clean water chamber of the clean water outlet.

According to a further embodiment of the present utility model, the first filter group includes: a central pipe, the installation cavity of the built-in filter material is arranged in the central pipe, and a pure water through hole is formed on the wall of the central pipe; reverse osmosis A filter membrane, the reverse osmosis filter membrane is sleeved on the central tube; an annular inner cover, the annular inner cover is sleeved on the central tube, the inner periphery of the annular inner cover is in contact with the inner tube The upper end of the ring is connected along the edge, and the lower end surface of the annular inner cover is in contact with the upper end surface of the reverse osmosis filter membrane.

According to a further embodiment of the present utility model, the annular inner cover defines a downwardly open waste water tank, and the upper end surface of the reverse osmosis membrane cooperates with the annular inner cover to close the waste water tank to form a waste water chamber, The top of the inner cover is provided with a waste water port connected to the waste water chamber, and the top of the housing is provided with a waste water outlet connected to the waste water port.

According to the composite filter element assembly according to one embodiment of the present invention, the second filter group includes: a support frame, the support frame is located in the inner tube and extends along the axial direction of the inner tube, the second water purification chamber Set in the support frame; primary filter membrane, the primary filter membrane is sleeved on the support frame and extends along the axial direction of the support frame, and the tap water chamber is defined on the peripheral wall of the primary filter membrane and the inner peripheral wall of the inner tube.

According to a further embodiment of the present utility model, the support frame is tubular, the second water purification chamber is defined between the inner cavity of the support frame and the outlet pipe, and the second water purification chamber communicates with the A clean water outlet, and a clean water through hole is formed on the wall of the supporting frame.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a schematic structural view of a composite filter element assembly according to an embodiment of the present invention.

Fig. 2 is a partial structural schematic diagram of a composite filter element assembly according to an embodiment of the present invention.

Fig. 3 is a sectional view along line A-A in Fig. 1 .

Fig. 4 is a cross-sectional view along line B-B in Fig. 2 .

Fig. 5 is an exploded view of the mechanism in Fig. 4 .

Fig. 6 is an exploded view of the housing of the composite filter element assembly according to one embodiment of the present invention.

Fig. 7 is a schematic diagram of cooperation between the inner tube and the activated carbon filter element according to an embodiment of the present invention.

Fig. 8 is a sectional view along line C-C in Fig. 7 .

Fig. 9 is a schematic structural view of an annular inner cover according to an embodiment of the present invention.

Fig. 10 is a cross-sectional view of an annular inner cover according to an embodiment of the present invention.

Fig. 11 is a top view of an annular inner cover according to an embodiment of the present invention.

Fig. 12 is a schematic structural view of a central tube according to an embodiment of the present invention.

Fig. 13 is a cross-sectional view of the central tube of an embodiment of the present invention.

Fig. 14 is a side view of the central tube of an embodiment of the present invention.

Fig. 15 is a schematic structural view of a waste water plug according to an embodiment of the present invention.

Fig. 16 is a partially enlarged schematic view of the water outlet pipe and the rubber retaining ring in Fig. 5 .

Reference signs:

Composite filter element assembly 100;

housing 10;

cylinder 11; tap water inlet 111; purified water outlet 112; purified water inlet 113; pure water outlet 114; waste water outlet 115;

lower cover 12;

Adapter 13;

Waste water plug 14; Plug end 141; Guide section 142;

decorative cover 15;

handle 16;

a first filter group 20;

central tube 21;

Coaming plate 211; pure water through hole 2111; water guide groove 2112;

Lower cover plate 212;

support platform 213;

reverse osmosis filter membrane 22; annular inner cover 23; waste water chamber 231; waste water port 232;

inner tube 30;

second filter group 40;

Support frame 41;

Primary filter membrane 42;

second inner end cap 43;

End plate 44; card protrusion 440; rubber retaining ring 441; protrusion 442;

a third filter group 50;

The first water purification chamber 51;

Pure water cavity 52; water outlet cavity 521; original pure water cavity 522;

Tap water cavity 53;

The second water purification chamber 54;

Outlet pipe 60.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

The following describes a composite filter element assembly 100 according to an embodiment of the present invention with reference to FIGS. 1-16 .

According to an embodiment of the utility model, a composite filter element assembly 100, as shown in Figures 1 and 3, includes: a housing 10, a first filter group 20, an inner tube 30, a second filter group 40, an outlet pipe 60, and a rubber retaining ring 441.

Specifically, the casing 10 is provided with a tap water inlet 111 , a purified water outlet 112 , a purified water inlet 113 and a pure water outlet 114 . Wherein, the tap water inlet 111 can lead into tap water, and the pure water outlet 114 can export the high-purity water filtered through the composite filter element assembly 100.

As shown in Figure 3, the first filter group 20 is located in the housing 10, and the first filter group 20 is defined with a built-in filter installation cavity, the inner tube 30 is detachably located in the built-in filter installation cavity, the second The filter group 40 is arranged in the inner tube 30 . By setting a built-in filter material installation cavity in the first filter group 20, the inner tube 30 is detachably arranged in the built-in filter material installation cavity. That is, the inner tube 30 can be easily taken out from the built-in filter material installation cavity for replacement, and can also be conveniently loaded into the built-in filter material installation cavity.

As shown in Figures 1, 3 and 4, one end of the water outlet pipe 60 is connected to the pure water outlet 114, and the other end of the water outlet pipe 60 penetrates the inner pipe 30 along the axial direction of the inner pipe 30, and then extends out of the inner pipe 30 and reaches Built-in filter material installation cavity. The inner pipe 30 communicates the pure water outlet 114 with the installation cavity of the built-in filter material.

As shown in FIG. 4 , FIG. 5 , and FIG. 16 , an end plate 44 is provided on the peripheral wall of the water outlet pipe 60 , and the second filter group 40 is glued to the end plate 44 . The outlet pipe 60 is provided with an end plate 44, and the second filter group 40 and the end plate 44 are glued together. On the one hand, the end plate 44 can provide support for the bottom of the second filter group 40; A good seal is formed between the rear end plate 44 and the second filter group 40, so that the water flows of different water quality on both sides of the second filter group 40 are not easy to cross flow at the bottom.

In addition, the rubber blocking ring 441 is overlaid on the water outlet pipe 60 , and the outer peripheral edge of the rubber blocking ring 441 blocks the circumferential outer side of the end plate 44 . The rubber retaining ring 441 is arranged at the end plate 44 of the water outlet pipe 60 , which reduces the glue overflow phenomenon that may occur when the second filter group 40 is glued to the end plate 44 . The rubber retaining ring 441 and the water outlet pipe 60 fit together, so that the water outlet pipe 60 is easy to process during production, and can be molded in half for large-scale manufacturing with high manufacturability.

It can be understood that, in the composite filter element assembly 100 of the present invention, the second filter group 40 is arranged in the inner pipe 30, and the inner pipe 30 is arranged in the first filter group 20, that is to say, the first filter group 20, The inner tube 30 and the second filter group 40 are nested in sequence, which can make full use of the space in the first filter group 20 .

The first filter group 20 and the second filter group 40 are spaced apart and compositely arranged in the housing 10 by using the inner tube 30, so that mutual interference will not occur when filtering between the two filter groups, and the original space for accommodating a filter element can be simultaneously Accommodating two filter groups saves the overall occupied space of the first filter group 20 and the second filter group 40 , making the overall structure of the composite filter element assembly 100 compact and highly integrated, which is conducive to reducing the size of the structure.

The utility model has the water outlet pipe 60 with the structure of the above-mentioned rubber retaining ring 441 and the end plate 44, so that the water outlet pipe 60 itself can be separated from the rubber retaining ring 441 during manufacture, without affecting the water outlet pipe 60. After the manufacture is completed, it is convenient to assemble the whole outlet pipe 60, and then assemble it with the rubber retaining ring 441, so that the efficiency of processing and manufacturing is greatly improved. The glue retaining ring 441 can also reduce the glue overflowing from the gap between the end plate 44 and the second filter group 40 when gluing, preventing the overflowing glue from affecting the filtering effect.

As shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 8, the second filter group 40 is arranged around the outlet pipe 60, the end plate 44 is formed as an annular plate and is connected to the end face of the second filter group 40, and the rubber retaining ring 441 includes : a connecting ring and a sealing ring, the sealing ring is cylindrical and sleeved on the outside of the second filter group 40 and the end plate 44, and the connecting ring extends radially inward from an end edge of the sealing ring away from the second filter group 40.

The connecting ring can further seal the glue overflowing in the circumferential direction during sealing between the second filter group 40 and the end plate 44 . The sealing ring can increase the contact between the connecting ring and the end plate 44 to prevent the glue from overflowing from the gap between the connecting ring and the end plate 44 . The lower periphery of the sealing ring is connected to the outer periphery of the connecting ring, the inner peripheral wall of the sealing ring is sealed against the outer peripheral wall of the primary filter membrane 42, and the section of the rubber retaining ring 441 is formed into an L shape.

Optionally, as shown in FIG. 16 , a locking protrusion 440 is provided on the end plate 44 , and a locking hole (not shown in the figure) matching the locking protrusion 440 is provided on the rubber retaining ring 441 . The card protrusion 440 cooperates with the card hole, so that the rubber retaining ring 441 can be further stuck on the end plate 44 on the basis of being sleeved on the water outlet pipe 60, so that the rubber retaining ring 441 can be easily assembled on the water outlet pipe 60, and the connection is increased. reliability and ease of assembly. At the same time, after the parts are disassembled, the rubber blocking ring 441 can also be used as an independent part, so that it will not affect the glue effect of the second filter group 40, nor will it affect the filtering effect of the second filter group 40, and greatly improve manufacturability.

Optionally, the rubber retaining ring 441 protrudes outward corresponding to each clamping hole to form a protrusion 442 , which facilitates the contact positioning of the rubber retaining ring 441 with the external components.

Advantageously, the water outlet pipe 60 is an integral injection molded part, and the end plate 44 is integrally injection molded on the water outlet pipe 60 . The end plate 44 and the water outlet pipe 60 are integrally injection-molded, which is convenient to use a mold to manufacture, and the end plate 44 has sufficient bearing capacity, and is not easy to be separated from the water outlet pipe 60 . Prevent skewing during long-term use.

In some embodiments of the present utility model, as shown in Figure 8, the inner tube 30 is detachably arranged in the built-in filter material installation cavity, and the inner tube 30 is formed into a tubular shape with one end open and the other end closed, and the inner tube 30 will be built in The filter material installation cavity is separated into an inner cavity and an outer cavity, and the second filter group 40 is arranged in the inner cavity. Since one side of the built-in filter material installation cavity is open, the water flow can not only pass through the first filter group 20 so that the first filter group 20, can also enter the inner cavity through the opening of the built-in filter material installation cavity, and filter through the second filter group 40, so that a series relationship is formed between the first filter group 20 and the second filter group 40.

In some embodiments of the present invention, as shown in Figures 2 and 4, the first filter group 20 is a reverse osmosis filter element, the second filter group 40 is a primary filter element, and the wall thickness of the primary filter element is greater than 10mm.

In some examples of the present invention, the second filter group 40 is a roll made of non-woven fabric, polypropylene layer, and carbon fiber, and has a long service life. When used to filter tap water, it can preliminarily remove sediment, rust and residual chlorine. Certainly, the second filter group 40 may also be rolled by filter layers of only one or two materials, which is not specifically limited here.

The filtering effect of the primary filter element is related to the wall thickness of the primary filter element. The thicker the wall of the primary filter element, the better the filtering effect. When the wall thickness of the primary filter element is greater than 10mm, it can meet the user's requirements for water filtration. The filtration effect of the reverse osmosis filter element is related to the area of the membrane around it. Therefore, a built-in filter material installation cavity is defined in the reverse osmosis filter element, and the primary filter element is arranged in the reverse osmosis filter element, which can reduce the volume of the primary filter element while ensuring the filtering effect of the primary filter element, thereby reducing the size of the primary filter element. It takes up less space, and can reduce the production materials of the primary filter element, thereby saving costs. The reverse osmosis filter element is placed outside the primary filter element, and the diameter of the reverse osmosis filter element is larger. , can reduce the wall thickness of the reverse osmosis filter element, and can also reduce the occupied space of the reverse osmosis filter element.

Thus, the first filter group 20 and the second filter group 40 combined above can occupy a small space while meeting the filtering requirements of the composite filter element assembly 100, and can maximize the utilization efficiency of the internal space of the housing 10, which is beneficial Reducing the overall volume of the composite filter element assembly 100 provides convenience for users.

As shown in Figure 1, according to the composite filter element assembly 100 of one embodiment of the present utility model, the housing 10 is provided with tap water inlet 111, purified water outlet 112, purified water inlet 113 and pure water outlet 114, wherein, tap water inlet 111 and The clean water outlet 112 communicates with the built-in filter material installation chamber.

As shown in Figure 3, the outer wall of the first filter group 20 and the inner wall of the housing 10 define the first water purification chamber 51 communicating with the water purification inlet 113, and the inner wall of the first filter group 20 and the outer wall of the inner pipe 30 define a communication The pure water chamber 52 of the pure water outlet 114, the inner wall of the inner pipe 30 and the outer wall of the second filter group 40 define the tap water chamber 53 communicating with the tap water inlet 111, and the second filter group 40 is defined with a second channel communicating with the purified water outlet 112. Clean water cavity 54.

The water flow enters the tap water chamber 53 through the tap water inlet 111, and the water flow in the tap water chamber 53 enters the second clean water chamber 54 through the filtration of the second filter group 40 and flows out through the clean water outlet 112, and the outflow clean water passes through the action of the booster pump Enter the first water purification chamber 51 through the water purification inlet 113, the water flow in the first water purification chamber 51 enters the pure water chamber 52 through the filtering effect of the first filter group 20, and the water in the pure water chamber 52 flows out through the pure water outlet 114 for the user to drink.

Wherein, there is a gap between the inner wall of the housing 10 and the outer wall of the first filter group 20 and forms a first uniform flow channel, and there is a gap between the inner wall of the first filter group 20 and the outer wall of the inner tube 30 and forms a second uniform flow channel. Distributing flow channels, there is a gap between the inner wall of the inner tube 30 and the outer wall of the second filter group 40 and forms a third uniform flow channel. In this way, not only can the normal flow of water be ensured, but also the volumes of the first filter group 20 and the housing 10 can be reduced to improve space utilization efficiency.

Moreover, utilize the inner wall of the housing 10, the inner wall of the first filter group 20, the outer wall of the first filter group 20, the inner wall of the inner tube 30, the outer wall of the inner tube 30 and the outer wall of the second filter group 40 to cooperate to define the first purified water The cavity 51 , the second clean water cavity 54 , the running water cavity 53 and the pure water cavity 52 have simple structures and are easy to implement, which is beneficial to simplify the structural design of the composite filter element assembly 100 and reduce the production cost of the composite filter element assembly 100 .

As shown in Figure 4, in some embodiments of the utility model, the first filter group 20 includes: a central pipe 21, a reverse osmosis filter membrane 22 and an annular inner cover 23, the central pipe 21 extends along the axial direction of the housing 10, and the central The upper end of the tube 21 is open to define a built-in filter material installation cavity, the inner tube 30 is set in the central tube 21, the pure water cavity 52 is defined between the inner wall of the central tube 21 and the outer wall of the inner tube 30, and the reverse osmosis filter membrane 22 is sleeved It is on the central tube 21 and extends along the axial direction of the central tube 21 . The annular inner cover 23 is sleeved on the central tube 21, and the inner peripheral edge of the annular inner cover 23 is in sealing contact with the upper edge of the inner tube 30, and the lower surface of the annular inner cover 23 is in sealing fit with the upper end surface of the reverse osmosis filter membrane 22. .

Further, as shown in Figures 9-11, the annular inner cover 23 is provided with a waste water port 232, and the annular inner cover 23 defines a waste water tank with an open lower surface, and the waste water tank extends along the circumferential direction of the annular inner cover 23. The upper end surface of the osmotic filter membrane 22 cooperates with the annular inner cover 23 to close the waste water tank to form a waste water chamber 231 , and the annular inner cover 23 defines a waste water passage connecting the waste water chamber 231 and the waste water outlet 115 .

The reverse osmosis filter element separates waste water during the filtration process, and the waste water can be guided to be discharged by setting the waste water port 232, the waste water cavity 231 and the waste water channel. Defining the waste water chamber 231 on the annular inner cover 23 can prevent the waste water from entering the first water purification chamber 51 , the pure water chamber 52 , the tap water chamber 53 and the second water purification chamber 54 , thereby improving the quality of the filtered water. Moreover, the waste water of the reverse osmosis filter element is discharged from the end of the reverse osmosis filter element, and the waste water cavity 231 is limited on the annular inner cover 23, which can provide convenience for the waste water to enter the waste water cavity 231, and the structure is simple, eliminating the reverse osmosis filter element and the waste water cavity 231 The diversion channel between them simplifies the structural design and waterway design of the composite filter element assembly 100 .

Wherein, the top of the housing 10 is provided with a waste water outlet 115 connected to the waste water port 232, the waste water in the waste water chamber 231 is discharged through the waste water outlet 115, and the waste water outlet 115 is provided with a waste water valve, and the waste water valve is integrally formed with the housing 10, when the waste water When the waste water in the cavity 231 reaches a certain pressure, the waste water valve is opened, and the waste water is discharged.

As shown in Figures 7 and 8, in some embodiments of the present utility model, the second filter group 40 is a primary filter element, and the second filter group 40 includes: a support frame 41 and a primary filter membrane 42, and the support frame 41 is located in the inner pipe 30 Inside and along the axial extension of the inner tube 30, the primary filter membrane 42 is sleeved on the support frame 41 and extends along the axial direction of the support frame 41. The primary filter membrane 42 is a tubular filter made of polyaluminum chloride material. And the thickness of the primary filter membrane 42 is greater than 10mm.

Wherein, the second water purification chamber 54 is defined in the support frame 41, the inner wall of the primary filter membrane 42 and the inner pipe 30 define a tap water chamber 53, tap water enters the tap water chamber 53 through the tap water inlet 111, and the water flow passes through the primary filter membrane 42 and The filtration effect of the primary filter membrane 42 flows out from the inner wall of the support frame 41 into the second water purification chamber 54 , and then flows out from the water purification outlet 112 .

Because the filtering effect of the primary filter membrane 42 is related to the thickness of the water flow passing through the primary filter membrane 42, the primary filter membrane 42 and the support frame 41 are formed into the second filter group 40 and are arranged in the inner tube 30, thereby reducing the size of the second filter group. 40, which in turn can reduce the occupied space of the second filter group 40, and can reduce the volume and production materials of the primary filter membrane 42, which is beneficial to reduce the cost.

Optionally, as shown in FIG. 5 , the support frame 41 is tubular, and a number of holes are formed on the wall of the support frame 41 through the wall of the support frame 41 along the thickness direction of the wall of the support frame 41 . By setting holes on the wall of the supporting frame 41 , the water flow in the primary filtration membrane 42 can be promoted to enter the second water purification chamber 54 through the holes.

As shown in Figures 3 and 8, in some embodiments of the present utility model, the second filter group 40 further includes: a second inner end cover 43 and an end plate 44, and the second inner end cover 43 is sleeved on the upper end of the support frame 41 The lower surface of the second inner end cover 43 is sealed against the upper surface of the primary filtration membrane 42 , the end plate 44 is sleeved on the lower end of the support frame 41 , and the upper surface of the end plate 44 is sealed against the lower surface of the primary filtration membrane 42 .

By arranging the second inner end cover 43 and end plate 44, the airtightness of the upper and lower ends of the primary filter membrane 42 can be improved, preventing the water flow in the primary filter membrane 42 from flowing out from the upper end or lower end of the primary filter membrane 42, which can not only prevent water from entering The water outlet cavity 521, and the airtightness of the tap water cavity 53 can be improved.

As shown in FIG. 8 , in some embodiments of the present invention, the outer periphery of the second inner end cover 43 is formed with an upper flanging folded downwards, and the inner wall of the upper flanging stops against the outer peripheral wall of the primary filter membrane 42 , The outer wall of the upper flanging and the inner wall of the inner pipe 30 define a tap water channel, and the water flow enters the tap water cavity 53 from the tap water inlet 111 through the tap water channel.

The outer periphery of the end plate 44 is provided with a rubber retaining ring 441, the rubber retaining ring 441 includes: a connecting ring and a sealing ring, the connecting ring extends along the circumferential direction of the end plate 44 and is connected with the outer periphery of the end plate 44, the sealing ring surrounds the end The plate 44 is arranged and extends along the axial direction of the end plate 44 , the lower peripheral edge of the sealing ring is connected to the outer peripheral edge of the connecting ring, and the inner peripheral wall of the sealing ring is sealed against the outer peripheral wall of the primary filtration membrane 42 .

In this way, the performance of the second filter group 40 can be improved, and the airtightness and reliability of the tap water chamber 53 can be improved to prevent water leakage.

In some embodiments of the present utility model, as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 7 and Fig. 8, it also includes: a third filter group 50, the third filter group 50 is arranged in the pure water cavity 52, the first The three filter groups 50 divide the pure water chamber 52 into an original pure water chamber 522 located outside the third filter group 50 and a water outlet chamber 521 located inside the third filter group 50 , and the water outlet chamber 521 communicates with the pure water outlet 114 .

That is to say, the pure water filtered by the first filter group 20 enters the original pure water chamber 522, the water in the original pure water chamber 522 passes through the third filter group 50, and enters the water outlet chamber through the filtering effect of the third filter group 50 521, the hollow activated carbon rod is selected as the third filter group 50, which can further filter out peculiar smell, organic matter, colloid, iron and residual chlorine in the water body. Among them, the first filter group 20 is a reverse osmosis filter element. The water filtered by the reverse osmosis filter element is weakly acidic and has a bad taste. Quality, enhance the taste of drinking water.

Moreover, setting the third filter group 50 in the pure water chamber 52 can further enhance the composite degree of the composite filter element assembly 100, and improve the filtering effect of the composite filter element assembly 100 on the water flow, and compared with the third filter element assembly 50 separately arranged In other words, not only can the water flow design of the composite filter element assembly 100 be simplified, but also the volume of the composite filter element assembly 100 can be reduced.

As shown in FIG. 8, in some embodiments of the present invention, the third filter group 50 and the inner tube 30 are arranged along the axial direction of the first filter group 20, that is to say, the first filter group 20 defines a The axially extending built-in filter material installation cavity of the filter group 20, the sum of the axial length of the inner tube 30 and the axial length of the third filter group 50 is less than or equal to the axial length of the built-in filter material installation cavity, the third filter group 50 It is arranged at the bottom of the built-in filter material installation cavity, and the inner pipe 30 is arranged at the top of the third filter group 50 .

The third filter group 50 and the inner pipe 30 arranged axially along the built-in filter material installation cavity inside the first filter group 20 can make full use of the space of the built-in filter material installation cavity, which is conducive to reducing the inner diameter of the built-in filter material installation cavity, and then The diameter and volume of the first filter group 20 can be reduced, and the structure of the third filter group 50 and the inner tube 30 is simple and easy to assemble.

In some embodiments of the present invention, as shown in Fig. 3, Fig. 4 and 8, the composite filter element assembly 100 also includes an outlet pipe 60, the outlet pipe 60 penetrates the inner pipe 30 along the axial direction of the inner pipe 30, and the outlet pipe 60 is plugged In the supporting frame 41, one end of the water outlet pipe 60 (the lower end as shown in Figure 8 ) communicates with the water outlet cavity 521, and the other end of the water outlet pipe 60 (the upper end as shown in Figure 8 ) communicates with the pure water outlet 114, and the supporting frame 41 A second clean water chamber 54 is defined between the inner wall and the outer wall of the water outlet pipe 60 .

In some embodiments of the present utility model, the pure water outlet 114 is located above the inner pipe 30, and the water outlet chamber 521 is located in the third filter group 50 and below the inner pipe 30. By setting the water outlet pipe 60, the water outlet chamber 521 can be It is convenient for the water flow to flow out from the pure water outlet 114, and the structure of the water outlet pipe 60 is simple and easy to realize.

In some embodiments of the present invention, as shown in Figure 13 and Figure 14, the central pipe 21 includes: a surrounding plate 211 and a lower cover plate 212, the surrounding plate 211 is formed into a cylindrical shape with open ends, and 22 sets of reverse osmosis membranes Set on the enclosure 211, the lower cover 212 is located in the enclosure 211 and is located at the bottom of the enclosure 211, the lower cover 212 closes the lower end of the enclosure 211 and cooperates with the enclosure 211 to define a built-in filter material installation cavity, The lower end of the third filter group 50 abuts against the upper surface of the lower end cover. That is to say, the central pipe 21 is formed into a cylindrical shape with an open upper end and a closed lower end, and the inner wall of the shroud 211 , the upper surface of the lower end cap and the outer surface of the inner pipe 30 cooperate to define a pure water chamber 52 .

The wall of the central tube 21 is formed with a pure water through hole 2111, the pure water through hole 2111 runs through the wall of the central tube 21 along the thickness direction of the wall of the central tube 21, and the water flow enters the reverse osmosis filter membrane 22 from the lower end of the reverse osmosis filter membrane 22 , the reverse osmosis filter membrane 22 filters the water flow into waste water and pure water, and the waste water flows out from the upper end of the reverse osmosis filter membrane 22 and is discharged through the waste water cavity 231 and the waste water outlet 115 . The pure water flows out from the inner wall of the reverse osmosis filter membrane 22 and enters the pure water chamber 52 through the pure water through hole 2111, and is discharged through the pure water outlet 114 for the user to drink.

As shown in Figure 12, a water guide groove 2112 connected to the pure water through hole 2111 is formed on the outer peripheral wall of the surrounding plate 211. The water guiding groove 2112 is recessed inwardly relative to the outer peripheral wall of the surrounding plate 211, and the water flow filtered by the reverse osmosis membrane 22 The pure water flows into the through hole 2111 through the water guide groove 2112, and then collects in the filter material installation cavity, and then is exported.

Since the reverse osmosis filter membrane 22 is wound around the shroud 211, by arranging the water guide groove 2112 on the shroud 211, the flow efficiency of the deriving water flow in the reverse osmosis filter membrane 22 can be increased, and the water outlet efficiency of the reverse osmosis filter membrane 22 can be increased. The water purification efficiency of the reverse osmosis filter element assembly can be improved.

As shown in Figure 12, the water guide groove 2112 extends along the circumference of the enclosure 211, that is to say the water guide groove 2112 is formed as a ring extending along the circumference of the enclosure 211, and the pure water through hole 2111 is arranged in the water guide groove 2112, thus The length of the water guide groove 2112 can be further increased, the water outlet efficiency of the reverse osmosis membrane 22 can be further improved, and the water outlet efficiency of the reverse osmosis membrane 22 can be guaranteed to be uniform in the circumferential direction, preventing local water outlet from being blocked and affecting the water purification efficiency of the reverse osmosis membrane 22 .

The central tube 21 of the above structure is closed at the lower end, which can prevent the pure water flow from leaking from the lower end of the pure water chamber 52. During the assembly process of the reverse osmosis filter element, only the airtightness of the upper end of the central tube 21 needs to be paid attention to. The closed structure of the lower end, as well as the structure of the inner tube 30 and the third filter group 50 arranged axially, make the inner tube 30 detachably set in the built-in filter material installation cavity, that is, as long as the inner tube 30 and the third filter group 50 It can be taken out or put on from the support platform 213 of the lower cover plate 212 together.

As shown in Figures 13 and 14, in some embodiments of the present invention, the inner wall of the shroud 211 is formed with a supporting platform 213 protruding inwardly along the radial direction of the shroud 211, the supporting platform 213 has an upper surface, and the inner tube 30 The lower end of the third filter group 50 is arranged below the inner tube 30 and is located inside the support platform 213 .

By setting the supporting platform 213 on the coaming plate 211 to cooperate with the inner tube 30, it can provide convenience for the assembly of the inner tube 30. The supporting role of the supporting platform 213 on the inner tube 30 can improve the assembly stability of the inner tube 30, and can reduce the The extrusion effect of the inner tube 30 on the third filter group 50 prevents damage to the third filter group 50 caused by the excessive pressure of the inner tube 30 , which is beneficial to prolong the service life of the third filter group 50 .

Optionally, as shown in FIG. 13 , the support platform 213 extends along the circumference of the enclosure 211, that is to say, the support platform 213 is formed as a ring extending along the circumference of the enclosure 211, and the support platform 213 can also extend along the circumference of the enclosure 211. The axial extension of 211 is formed into a tubular shape, and the lower end of the support platform 213 touches the upper surface of the lower end cover of the central tube 21 , and the third filter group 50 is arranged in the support platform 213 .

The tubular support platform 213 can improve the force uniformity of the inner tube 30 and prevent the inner tube 30 from being damaged or tilted due to local uneven force. Wherein, the support platform 213, the surrounding plate 211 and the lower end cover are integrally formed, that is to say, the central tube 21 is an integrally formed part, and the integrally formed central tube 21 can improve the connection stability between the supporting platform 213, the surrounding plate 211 and the lower end cover and connection strength, thereby improving the functional stability and reliability of the central tube 21, and eliminating the connection mechanism between the support table 213, the surrounding plate 211 and the lower end cover, and improving the assembly efficiency of the central tube 21 and the composite filter element assembly 100 , and the integrally formed central tube 21 has high strength and long service life.

In some embodiments of the present invention, as shown in FIG. 6 , the housing 10 includes: a cylinder body 11 and a lower cover 12, the bottom of the cylinder body 11 is open, the first filter group 20 is arranged in the cylinder body 11, and the tap water inlet 111 , clean water outlet 112, clean water inlet 113 and pure water outlet 114 are all located on the top of the cylinder 11, the lower cover 12 is connected with the cylinder 11 to close the opening of the cylinder 11, and the upper surface of the lower cover 12 is connected to the first The lower end surface of a filter group 20 is in sealing abutment.

Wherein, the casing 10 is also provided with four adapters 13, and the four adapters 13 are plugged into the tap water inlet 111, the purified water outlet 112, the purified water inlet 113 and the pure water outlet 114 in a one-to-one correspondence. The joint 13 provides convenience for the composite filter element assembly 100 to assemble the waterway, and improves the airtightness of the waterway.

As shown in Figure 15, waste water outlet 115 is provided with waste water plug 14, and waste water plug 114 is plugged in waste water outlet 115, and waste water plug 14 produces certain resistance to the water in waste water chamber 231, when the water pressure in waste water chamber 231 When the predetermined pressure is reached, the waste water plug 14 is turned on, and the waste water is discharged from the waste water cavity 231 .

In some embodiments of the present utility model, the waste water plug 14 includes: a sleeve and a plurality of capillaries, the sleeve is inserted into the waste water outlet 115 and connected with the housing 10, and the capillary is arranged on the inner wall of the sleeve and along the side of the sleeve. Extend radially inward.

There are a large number of capillaries, and multiple capillaries are arranged along the circumferential direction of the casing to form a capillary group, and the multiple capillary groups are filled in the casing along the axial direction of the casing. The waste water plug 14 with the above structure has a simple structure, is easy to manufacture, and can effectively improve the water purification effect of the reverse osmosis filter element.

In some embodiments of the present invention, as shown in FIG. 15 , the casing includes: an insertion section 141 and a guide section 142 , one end of the insertion section 141 is inserted into the waste water outlet 115 , and the insertion section 141 is inserted along the waste water outlet 115 The axial extension of the guiding section 142 communicates with the other end of the inserting section 141 . Both the inserting section 141 and the guiding section 142 are provided with capillaries, or only the inserting section 141 or the guiding section 142 may be provided with capillaries.

The casing with the above structure can not only increase the water pressure of the waste water chamber 231, but also the plug-in section 141 is inserted into the waste water outlet 115, which has good stability and airtightness. Wherein, the guide section 142 is perpendicular to the plug-in section 141, which facilitates the connection of the waste water drain pipe to the guide section 142, and provides convenience for waste water discharge.

Wherein, the housing 10 is also provided with a decorative cover 15, the decorative cover 15 is set on the top of the cylinder body 11, the tap water inlet 111, the purified water outlet 112, the purified water inlet 113, the pure water outlet 114 and the waste water outlet 115 are all covered. Inside the decorative cover 15 , the appearance of the composite filter element assembly 100 is thus improved.

In some embodiments of the present utility model, a handle 16 is provided on the top of the cylinder body 11, a first connection point and a second connection point arranged at intervals are arranged on the side wall of the cylinder body 11, and one end of the handle 16 is connected to The first connection point, and the other end is connected to the second connection point. When removing or assembling the composite filter element assembly 100, the user can take and place the composite filter element 100 through the handle 16, which is convenient to operate and strong in stability, and the handle 16 has a simple structure and is easy to implement. .

During the assembly process of the composite filter element assembly 100, the reverse osmosis filter membrane 22 is wound on the central tube 21 first, then the third filter group 50 is set in the built-in filter material installation cavity, and then the inner tube 30 is assembled on the built-in filter material In the installation chamber, the lower end of the inner pipe 30 stops against the third filter group 50, then the outlet pipe 60 is plugged into the inner pipe 30, then the second filter group 40 is sleeved on the outlet pipe 60, and finally the ring-shaped inner cover 23 is covered on the central pipe 21, and the outlet pipe 60 and the second inner end cover 43 protrude from the middle of the annular inner cover 23. Then the first filter group 20 is plugged into the cylinder body 11. The top wall of the cylinder body 11 is provided with a first water channel, a second water channel, a third water channel, a fourth water channel and a fifth water channel. The first water channel communicates with Pure water outlet 114 and water outlet pipe 60, one end of the second water channel is connected to tap water inlet 111, and the other end is connected to the passage between the outer peripheral wall of the second inner end cover 43 and the inner peripheral wall of the annular inner cover 23; The water outlet 112, the other end communicates with the channel between the inner peripheral wall of the second inner end cover 43 and the outer peripheral wall of the water outlet pipe 60, one end of the fourth water channel communicates with the clean water inlet 113, and the other end communicates with the outer peripheral wall of the reverse osmosis filter membrane 22 The fifth channel communicates with the waste water outlet 115 and the waste water port 232 as the channel between the inner peripheral wall of the cylinder body 11 .

In some embodiments of the present invention, the central axis of the first filter group 20 , the central axis of the second filter group 40 , the central axis of the inner pipe 30 , the central axis of the outlet pipe 60 coincide with the central axis of the casing 10 . That is to say, the water outlet pipe 60, the second filter group 40, the inner pipe 30, the first filter group 20 and the housing 10 are nested in sequence, thereby reducing the size of the water outlet pipe 60, the second filter group 40, and the inner pipe 30. and the space occupied by the first filter group 20 improve the utilization efficiency of the inner space of the composite filter element assembly 100 , thereby reducing the volume of the housing 10 and providing convenience for the use and assembly of the composite filter element assembly 100 .

In order to better understand the solutions of the embodiments of the present invention, the structure of a composite filter element assembly 100 in a specific embodiment of the present invention will be described below with reference to FIGS. 1-16 .

The following specific embodiments take the purification of tap water as an example to describe the three-stage filtering function of the composite filter element assembly 100, and illustrate the highly integrated integrated design structure of the composite filter element assembly 100, and the handle 16 for the composite filter element assembly 100 to be convenient for taking and placing. In addition, the second filter group 40 is illustrated by taking a roll-type primary filter element rolled by non-woven fabric, polypropylene layer, carbon fiber and support frame 41 as an example; the first filter group 20 uses a reverse osmosis filter element as an intermediate filter Take this as an example. The third filter group 50 is described by taking a cylindrical hollow carbon rod as the final filter as an example.

As shown in Figures 1-16, a composite filter element assembly 100, the entire composite filter element assembly 1000 is normally installed in a vertical state. The composite filter element assembly 100 includes: a housing 10 , a first filter group 20 , an inner tube 30 , a second filter group 40 , a third filter group 50 , an outlet pipe 60 , and a rubber retaining ring 441 . A filter cavity is defined in the housing 10, and the first filter group 20 is arranged in the filter cavity, and a built-in filter material installation cavity with one side open is defined in the first filter group 20, and the inner tube 30 is detachably arranged in the built-in filter material installation cavity. In the cavity, the second filter group 40 is arranged in the inner tube 30 . The outer wall of the first filter group 20 and the inner wall of the housing 10 define the first clean water cavity 51 communicating with the purified water inlet 113, and the inner wall of the first filter group 20 and the outer wall of the inner pipe 30 define a pure water chamber 51 communicating with the pure water outlet 114. The water chamber 52 , the inner wall of the inner pipe 30 and the outer wall of the second filter group 40 define a tap water chamber 53 connected to the tap water inlet 111 , and a second clean water chamber 54 connected to the clean water outlet 112 is defined in the second filter group 40 . The upper part of the casing 10 is also provided with a waste water port 232 communicating with the first filter group 20 .

Specifically, the inner pipe 30 and the third filter group 50 are arranged axially forward and backward in the built-in filter material installation chamber, the center pipe 21 inside the first filter group 20 forms a pure water chamber 52, and the third filter group 50 will The pure water chamber 52 is divided into an outer raw pure water chamber 522 and an inner water outlet chamber 521 . The two ends of the upper part of the housing 10 near the decorative cover 15 are respectively provided with a connecting point connected with the handle 16 . One end of the water outlet pipe 60 is connected to the pure water outlet 114, and the other end of the water outlet pipe 60 passes through the inner pipe 30 along the axial direction of the inner pipe 30, then extends out of the inner pipe 30 and extends into the support frame 41 of the third filter group 40, and communicates with Water outlet chamber 521.

As shown in FIG. 16 , the second filter group 40 is arranged around the water outlet pipe 60 , the end plate 44 is integrally injection molded with the water outlet pipe 60 , and the end plate 44 is formed as an annular plate and connected to the end surface of the second filter group 40 . The rubber retaining ring 441 includes: a connecting ring and a sealing ring, the sealing ring is cylindrical and sleeved on the outside of the second filter group 40 and the end plate 44, and the connecting ring is radially extend inward. The end plate 44 is provided with a plurality of clamping protrusions 440, and the rubber retaining ring 441 is provided with a clamping hole matching the clamping protrusions 440. When the rubber retaining ring 441 is set on the water outlet pipe 60, the clamping protrusions 440 and the clamping holes are engaged with each other Cooperate.

The entire tap water filtering process is that tap water enters the tap water chamber 53 from the tap water inlet 111 , flows radially inward, enters the second water purification chamber 54 through the filtration of the second filter group 40 and flows out through the water purification outlet 112 . The outflowing clean water enters the first clean water chamber 51 through the clean water inlet 113 through the action of the booster pump, and the water flow in the first clean water chamber 51 enters the original pure water chamber 522 through the filtering effect of the first filter group 20, and the original pure water The water in the water cavity 522 is filtered by the third filter group 50 and then enters the water outlet cavity 521 , and then flows upward from the water outlet pipe 60 and flows out from the pure water outlet 114 for drinking by the user.

In addition, the matching structure of the rubber retaining ring 441 and the end plate 44 of the present invention can also be used in other types of filter element assemblies that need to retain glue, and is not limited to the water outlet pipe 60 of the composite filter element assembly 100 mentioned in the present invention. Glue blocking during glue blocking between the glue blocking plate 44 and the second filter group 40 .

In describing the present invention, it should be understood that the terms "center", "lateral", "length", "width", "thickness", "upper", "lower", "vertical", "top" , "Bottom", "Inner", "Outer", "Axial", "Radial", "Circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are for convenience only The present invention is described and simplified descriptions do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In addition, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of these features, which are used to distinguish and describe features, without order or importance .

In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Three filter groups are shown in Fig. 3 for the purpose of illustration, but after reading the technical solution above, the ordinary skilled person can obviously understand that this solution is applied to the technical solution of two or more filter groups, This also falls within the protection scope of the present utility model.

Other components of the composite filter element assembly 100 according to the embodiment of the present utility model, such as the specific structure and filtering principle of the reverse osmosis filter element, are known to those skilled in the art and will not be described in detail here.

In the description of this specification, descriptions with reference to the terms "embodiment", "example" and the like mean that specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention middle. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A composite filter element assembly, characterized in that, comprising: A housing, the housing is provided with a tap water inlet, a purified water outlet, a purified water inlet and a pure water outlet; A first filter group, the first filter group is arranged in the housing, and a built-in filter material installation cavity is defined in the first filter group; an inner tube, the inner tube is detachably arranged in the installation cavity of the built-in filter material; a second filter group, the second filter group is arranged in the inner tube; A water outlet pipe, one end of the water outlet pipe is connected to the pure water outlet, and the other end of the water outlet pipe passes through the inner pipe along the axial direction of the inner pipe, then extends out of the inner pipe and extends to the built-in In the filter material installation cavity, an end plate is provided on the outer peripheral wall of the outlet pipe, and the second filter group is glued to the end plate; A rubber retaining ring, the rubber retaining ring is overlaid on the water outlet pipe, and the outer periphery of the rubber retaining ring blocks the circumferential outer side of the end plate. 2. The composite filter element assembly according to claim 1, wherein the second filter group is arranged around the outlet pipe, and the end plate is formed as an annular plate and connected to the end face of the second filter group , The rubber retaining ring includes: a connecting ring and a sealing ring, the sealing ring is cylindrical and sleeved on the outside of the second filter group and the end plate, the connecting ring is away from the sealing ring One edge of the second filter group extends radially inward. 3 . The composite filter element assembly according to claim 1 , wherein a protrusion is provided on the end plate, and a locking hole matching the protrusion is provided on the rubber retaining ring. 4 . 4 . The composite filter element assembly according to claim 1 , wherein the water outlet pipe is an integral injection molded part, and the end plate is integrally injection molded on the water outlet pipe. 5. The composite filter element assembly according to claim 1, wherein a third filter group is also provided in the first filter group, a water outlet chamber is formed in the third filter group, and the water outlet chamber communicates with the outlet pipe. 6. The composite filter element assembly according to claim 1, wherein the outer wall of the first filter group and the inner wall of the housing define a first water purification chamber communicating with the water purification inlet; The inner wall of the first filter group and the outer wall of the inner pipe define a pure water cavity; The inner wall of the inner pipe and the outer wall of the second filter group define a tap water cavity communicating with the tap water inlet; A second water purification chamber communicating with the water purification outlet is defined in the second filter group. 7. The composite filter element assembly according to claim 6, wherein the first filter group comprises: A central tube, the built-in filter material installation cavity is arranged in the central tube, and a pure water through hole is formed on the wall of the central tube; A reverse osmosis filter membrane, the reverse osmosis filter membrane is sleeved on the central tube; An annular inner cover, the annular inner cover is sleeved on the central tube, the inner peripheral edge of the annular inner cover is connected with the upper edge of the inner tube, and the lower end surface of the annular inner cover is connected to the opposite The upper end surface of the permeation filter membrane stops. 8. The composite filter element assembly according to claim 7, wherein the annular inner cover defines a downwardly open waste water tank, and the upper end surface of the reverse osmosis filter membrane cooperates with the annular inner cover to close the The waste water tank forms a waste water chamber, the top of the inner cover is provided with a waste water port connected to the waste water chamber, and the top of the housing is provided with a waste water outlet connected to the waste water port. 9. The composite filter element assembly according to claim 6, wherein the second filter group comprises: A supporting frame, the supporting frame is located in the inner tube and extends along the axial direction of the inner tube, the second water purification chamber is arranged in the supporting frame; A primary filter membrane, the primary filter membrane is sleeved on the support frame and extends along the axial direction of the support frame, and the tap water chamber is defined between the outer peripheral wall of the primary filter membrane and the inner peripheral wall of the inner pipe between. 10. The composite filter element assembly according to claim 9, wherein the support frame is tubular, and the second water purification chamber is defined between the inner cavity of the support frame and the outlet pipe, and the The second water purification chamber communicates with the water purification outlet, and a water purification through hole is formed on the wall of the support frame.