CN209307051U

CN209307051U - Composite filter element component

Info

Publication number: CN209307051U
Application number: CN201821790361.0U
Authority: CN
Inventors: 李杨敏; 陈伟明
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2019-08-27
Anticipated expiration: 2028-10-31

Abstract

The utility model discloses a composite filter element assembly, which comprises a shell, an inner tube, a first filter group, a second filter group, a fixing structure and a handle. Wherein, the first filter group is arranged in the housing, and a built-in filter material installation cavity is defined in the first filter group; the inner tube is detachably arranged in the built-in filter material installation cavity; the second filter group is set in the inner tube; the fixed structure It is located on the shell; the handle is provided with a matching structure, which can rotate and cooperate with the fixed structure. The matching structure has a first position and a second position in the direction of rotation relative to the fixed structure. In the first position, the matching structure can be withdrawn. The plug connection is on the fixed structure, and the matching structure is engaged with the fixed structure in the second position to form an anti-loosening structure. The composite filter element assembly of the embodiment of the utility model has high integration degree, small volume, large throughput, convenient pick-and-place during installation and replacement, and good filtering effect.

Description

Composite filter element assembly

Technical Field

The utility model belongs to the technical field of the water purification, specifically a compound filter element group spare.

Background

The tap water delivered to each user from a municipal water plant will typically contain a certain amount of salt ions, metallic substances, chlorides, microorganisms, silt, etc. In order to improve the drinking water quality, more and more families choose to install water purifiers on the water outlet pipe of tap water, and filter elements with multiple functions are arranged in the water purifiers so as to remove different types of harmful substances in the tap water.

Generally, current purifier filter core is generally 3 ~ 4 grades, and some producer's purifier filter core is two cores. In order to improve composite filter element's filter effect, arrange multiple filter element group spare in the water purifier usually, advance between each filter element group spare, the delivery port is established ties in proper order, the filter core both sides of difference form the cavity of intaking respectively, go out the water cavity, in order to reach the drinking water of high-quality, often need establish ties threely, level four filter element group spare, all need outside pipeline to connect between delivery port and the water inlet between the different filter element group spares, it is numerous and diverse to make composite filter element group spare pipe-line system, water purifier complete machine occupation space is great, inconvenient installation and renew cartridge.

In addition, when replacing all levels of filter elements, the filter elements are often required to be held, and the filter elements are inconvenient to take and place.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a compound filter element group spare, compound filter element group spare is small, and the filter effect is good, gets to put the convenience.

According to the utility model discloses compound filter element group spare, include: a housing; the first filter group is arranged in the shell, and a built-in filter material installation cavity is defined in the first filter group; the inner pipe is detachably arranged in the built-in filter material mounting cavity; a second filter bank disposed within the inner tube; a fixed structure provided on the housing; the handle, be equipped with the cooperation structure on the handle, the cooperation structure can with fixed knot constructs normal running fit, the cooperation structure is relative fixed knot constructs first position and second position on the rotation direction has, when the first position the cooperation structure can take out to insert to be connected on the fixed knot constructs, when the second position the cooperation structure with the fixed knot constructs the block and forms anti-disengaging structure.

According to the utility model discloses compound filter element group spare sets up on the casing with handle complex fixed knot constructs, multiplicable compound filter element group spare get put the convenience. The matching structure on the handle can rotate in the fixed structure and can be changed between a first position and a second position, the matching structure and the fixed structure are conveniently connected in the first position, and the handle is easily installed on the shell; the cooperation structure and the mutual block of fixed knot construct when the second position, but the anticreep to be convenient for mention, prevent to separate between the in-process handle of lifting the handle and the casing. The second filter group is arranged in the inner pipe, and the inner pipe is arranged in the first filter group, namely the first filter group, the inner pipe and the second filter group are sequentially nested, so that the space in the first filter group can be fully utilized, the first filter group and the second filter group are spaced and compositely arranged in the shell by utilizing the inner pipe, the space of the original filter pipe accommodates two filter pipes, and the occupied space of the first filter group and the second filter group is saved. And the inner pipe assembly that can dismantle the setting is simple, provides convenience for first filter bank assembly.

According to the utility model discloses a compound filter element group spare of embodiment, the cooperation structure is first grafting structure, first grafting structure includes the open-ended axle sleeve of tip, be equipped with the guide way on the inner wall of axle sleeve, the guide way is opened at the open one end of axle sleeve, open the card hole on one side of guide way on the axle sleeve; the fixing structure comprises a guide post and a limiting post connected to the peripheral wall of the guide post; when the guide post is at the first position, the guide post can be inserted into the shaft sleeve, meanwhile, the limit post can be inserted into the guide groove, and when the guide post is at the second position, the limit post is clamped in the clamping hole.

According to a further embodiment of the invention, the guide groove extends in the axial direction of the shaft sleeve, or the guide groove extends helically in the direction from the end to the snap hole.

According to the utility model discloses further embodiment, the guide way with the card hole is all in link up in the thickness direction of axle sleeve the axle sleeve.

According to the composite filter element assembly of one embodiment of the present invention, the fitting structure is a second inserting structure, the second inserting structure includes an inserting column, and a clamping block is disposed at an end of the inserting column to make the end of the inserting column non-circular; a groove is defined in the fixing structure, a necking is formed at the end part of the groove, and the necking is formed into a non-circular shape matched with the end part of the inserting column; and when the first position, the inserting column can be inserted into the groove through the necking, and when the second position, the clamping block is clamped on the inner side of the necking.

According to the utility model discloses further embodiment, be equipped with the jack of coaxial setting on inserting the post, be equipped with the spliced pole in the recess, the spliced pole is inserted in the jack.

According to the utility model discloses optional embodiment, the outer contour shape of the tip of inserting the post is half for semi-circular, half for half oval, the shape of the throat of recess is half for semi-circular, half for half oval.

According to the composite filter element assembly of one embodiment of the utility model, the end part of the shell is provided with a tap water inlet, a purified water outlet, a purified water inlet and a purified water outlet; the outer wall of the first filtering group and the inner wall of the shell define a first purified water cavity communicated with the purified water inlet; the inner wall of the first filtering group and the outer wall of the inner pipe define a pure water cavity communicated with the pure water outlet; the inner wall of the inner pipe and the outer wall of the second filtering group define a tap water cavity communicated with the tap water inlet; and a second purified water cavity communicated with the purified water outlet is defined in the second filtering group.

According to the utility model discloses a compound filter element group spare of embodiment, first filter group includes: the built-in filter material installation cavity is arranged in the central tube, and a pure water through hole is formed in the wall of the central tube; the reverse osmosis filter membrane is sleeved on the central tube; the annular inner cup, annular inner cup cover is established on the center tube, the interior week edge of annular inner cup with the upper end edge of inner tube links to each other, just the lower terminal surface of annular inner cup with the up end of reverse osmosis filter membrane ends.

According to the utility model discloses still further embodiment, inject downward open wastewater disposal basin in the annular inner cup, the up end of reverse osmosis filter membrane with the cooperation of annular inner cup is sealed the wastewater disposal basin forms the waste water chamber, the inner cup top is equipped with the intercommunication the waste water mouth in waste water chamber, the top of casing is equipped with the intercommunication the waste water export at waste water mouth.

According to the utility model discloses a compound filter element group spare still includes: the third filtering group is arranged in the pure water cavity, and the third filtering group and the inner pipe are arranged along the axial direction of the first filtering group; the third filtering group divides the pure water cavity into an original pure water cavity outside the third filtering group and a water outlet cavity inside the third filtering group, and the water outlet cavity is communicated with the pure water outlet.

According to the utility model discloses a compound filter element group spare still includes: the water outlet pipe penetrates through the inner pipe along the axial direction of the inner pipe, one end of the water outlet pipe is communicated with the water outlet cavity, and the other end of the water outlet pipe is communicated with the pure water outlet.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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 schematic view of a partial structure of a composite filter element assembly according to an embodiment of the present invention.

Fig. 3 is a sectional view taken along line a-a of fig. 1.

Fig. 4 is a sectional view taken along line B-B of fig. 2.

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

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

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

Fig. 8 is a sectional view taken along line C-C of fig. 7.

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

Fig. 10 is a cross-sectional view of an annular inner cap in accordance with an embodiment of the present invention.

Fig. 11 is a top view of an annular inner cover in accordance with an embodiment of the present invention.

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

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

Figure 14 is a side view of a center tube according to an embodiment of the present invention.

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

Fig. 16 is a schematic view of a first fastening structure and a first plug structure of a composite filter element assembly according to an embodiment of the present invention in a first position.

Fig. 17 is a partially enlarged schematic view of the first fixing structure and the first plugging structure in the first position according to an embodiment of the present invention.

Fig. 18 is a schematic view of the first fixing structure and the first plugging structure of the composite filter element assembly of an embodiment of the present invention in a second position.

Fig. 19 is a partially enlarged schematic view of the first fixing structure and the first plugging structure in the second position according to an embodiment of the present invention.

Fig. 20 is a schematic perspective view of a handle with a first plug structure according to an embodiment of the present invention.

Fig. 21 is a schematic view of a second fastening structure and a second plug structure of a composite filter element assembly according to an embodiment of the present invention in a first position.

Fig. 22 is a partial schematic structural view of the second fixing structure and the second plugging structure of the present invention in the first position.

Fig. 23 is a schematic view of a second fastening structure and a second plug structure of a composite filter element assembly according to an embodiment of the present invention in a second position.

Fig. 24 is a schematic structural view of a second fixing structure and a second plugging structure of an embodiment of the present invention in a second position.

Fig. 25 is a top view of a second securing structure and a second plug structure of a composite filter element assembly according to an embodiment of the present invention.

Fig. 26 is a schematic perspective view of a handle with a second plug structure according to an embodiment of the present invention.

Reference numerals:

a composite filter element assembly 100;

a housing 10;

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

a lower cover 12;

an adapter 13;

a waste plug 14; a plug section 141; a guide section 142;

a decorative cover 15;

a handle 16;

the mating structure 161;

a first plug structure 1611; a sleeve 16111; a guide groove 16112; a card hole 16113;

a second plug-in structure 1612; a plug 16121; a receptacle 16122; a fixture block 16123;

a fixed structure 17;

a first fixed structure 171; guide posts 1711; a spacing post 1712;

a second fixed structure 172; a groove 1721; a throat 1722; a connecting post 1724;

a first filter bank 20;

a central tube 21;

a coaming 211; a pure water through hole 2111; a water chute 2112;

a lower cover plate 212;

a support stage 213;

a reverse osmosis filtration membrane 22; an annular inner lid 23; a waste water chamber 231; a waste water port 232;

an inner tube 30;

a second filter bank 40;

a support frame 41; a primary filtration membrane 42; a second inner end cap 43; an end plate 44; a glue blocking ring 441;

a third filter bank 50;

a first purified water chamber 51;

a pure water chamber 52; a water outlet cavity 521; an original pure water chamber 522;

a tap water chamber 53;

a second purified water chamber 54;

and a water outlet pipe 60.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A composite filter element assembly 100 according to an embodiment of the present invention is described below with reference to fig. 1-26.

A composite filter element assembly 100 according to an embodiment of the present invention, as shown in fig. 1 and 3, includes: housing 10, first filter group 20, inner tube 30, second filter group 40, securing structure 17, handle 16.

Specifically, as shown in fig. 3, 4, 5, 7, and 8, a filter cavity is defined in the housing 10, the first filter group 20 is disposed in the filter cavity, a built-in filter material installation cavity with one side open is defined in the first filter group 20, the inner tube 30 is detachably disposed in the built-in filter material installation cavity, and the second filter group 40 is disposed in the inner tube 30. By providing a built-in filter material installation cavity within the first filter bank 20, the inner tube 30 is removably disposed within the built-in filter material installation cavity. That is, the inner tube 30 can be conveniently taken out from the built-in filter material installation cavity for replacement, and can also be conveniently installed in the built-in filter material installation cavity.

As shown in fig. 16-26, the securing structure 17 is provided on the housing 10. The handle 16 is provided with a matching structure 161, and the matching structure 161 can be rotatably matched with the fixed structure 17. Through the mutual cooperation of the matching structure 161 and the fixing structure 17, the handle 16 can be rotatably connected to the housing 10, so that the handle 16 can be directly lifted without holding the housing 10 when the composite filter element assembly 100 is conveniently taken and placed.

The engaging structure 161 has a first position and a second position relative to the fixing structure 17 in the rotation direction, the engaging structure 161 can be inserted into the fixing structure 17 in the first position, and the engaging structure 161 is engaged with the fixing structure 17 in the second position to form an anti-disengaging structure.

It can be understood that the composite filter element assembly 100 of the present invention, with the second filter group 40 being disposed inside the inner tube 30 and the inner tube 30 being disposed inside the first filter group 20, that is, the first filter group 20, the inner tube 30 and the second filter group 40 being nested in sequence, can make full use of the space inside the first filter group 20.

Utilize inner tube 30 to separate first filter group 20 and second filter group 40 spaced-apart compound setting in casing 10, can not take place mutual interference when filtering between two filter groups, and originally hold the space of a filter core and can hold two filter groups simultaneously, saved first filter group 20 and second filter group 40's total occupation space for compound filter element group 100 holistic compact structure, the integration degree is high, is favorable to reducing the overall dimension.

The inner pipe 30 which is detachably arranged is simple to assemble, provides convenience for assembling and replacing the first filter group 20, and provides possibility for customers to independently replace cores.

The engaging structure 161 of the handle 16 can rotate in the fixing structure 17 and can be changed between a first position and a second position, in the first position, the engaging structure 161 and the fixing structure 17 are conveniently connected, and only the engaging structure 161 needs to be connected in the fixing structure 17 in a pulling and inserting manner, so that the handle 16 is easily installed on the casing 10.

The matching structure 161 and the fixing structure 17 are mutually clamped at the second position, so that the matching structure 161 and the fixing structure 17 are firmly connected and can be prevented from falling off, the lifting is facilitated, and the handle 16 and the shell 10 are prevented from being separated in the lifting process of the handle 16.

The utility model discloses compound filter element group spare 100 with above-mentioned handle 16 structure compares the filter element group spare that does not have the handle among the prior art, or can only fixed connection handle 16's filter element group spare 100, and it has the convenience of installation concurrently to and the load performance in the installation back use.

In some embodiments of the present invention, as shown in fig. 16-20, the mating structure 161 is a first plug structure 1611, the first plug structure 1611 includes a shaft sleeve 16111 with an open end, a guide slot 16112 is disposed on an inner wall of the shaft sleeve 16111, the guide slot 16112 is open at the open end of the shaft sleeve 16111, and a locking hole 16113 is disposed on one side of the guide slot 16112 on the shaft sleeve 16111. The fixing structure 17 includes a guide post 1711 and a stopper post 1712 connected to the peripheral wall of the guide post 1711.

With the handle 16 having the above connection engagement structure, in the first position, as shown in fig. 16 and 17, when the sleeve 16111 is aligned with the guide post 1711, the stop post 1712 is aligned with the guide slot 16112. The guide post 1711 is inserted into the boss 16111, while the restraint post 1712 is inserted into the guide slot 16112. That is, in the first position, the guiding post 1711 and the limiting post 1712 are inserted into the shaft sleeve 16111 and the guiding slot 16112 without being blocked, and the guiding post 1711 and the limiting post 1712 can be pulled out from the shaft sleeve 16111 and the guiding slot 16112 without being blocked, so that the handle 16 can be mounted on the housing 10.

In the second position, as shown in fig. 18 and 19, the restraint posts 1712 snap into the snap holes 16113. That is, when the position-limiting post 1712 is rotated from the first position to the second position, the position-limiting post 1712 is inserted into the locking hole 16113 through the guide slot 16112, and the locking hole 16113 prevents the position-limiting post 1712 from moving in the axial direction.

For convenience of description, hereinafter, the fixing structure 17 engaged with the first insertion structure 1611 is referred to as a first fixing structure 171, and the fixing structure 17 engaged with the second insertion structure 1612 is referred to as a second fixing structure 172.

Furthermore, features defined as "first," "second," and "third" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, and non-trivial.

Optionally, the guide slot 16112 extends in the axial direction of the sleeve 16111. At this time, when the shaft sleeve 16111 is inserted into the guide post 1711, the shaft sleeve 16111 is moved in the axial direction to move the engaging hole 16113 to the engaging post 1712, and then the handle 16 is rotated to engage the engaging post 1712 in the engaging hole 16113.

In other embodiments, the guide slot 16112 extends helically in a direction from the end to the card aperture 16113, i.e., the guide slot 16112 is a helically extending slot. When the shaft sleeve 16111 is inserted into the guide post 1711, the shaft sleeve 16111 is rotated while the shaft sleeve 16111 is moved in the axial direction (similar to a screwing operation), so that the engaging hole 16113 is moved to the engaging post 1712, and then the handle 16 is rotated, so that the engaging post 1712 is engaged in the engaging hole 16113.

Alternatively, the guide groove 16112 and the card hole 16113 both penetrate the boss 16111 in the thickness direction of the boss 16111. It is also convenient to machine the guide slot 16112 and the locking hole 16113 in the sleeve 16111. Of course, the present invention is not limited to this, and the guide groove 16112 and the locking hole 16113 may be provided on the inner wall of the boss 16111, for example, to achieve the above-described function.

In other embodiments of the present invention, as shown in fig. 21-26, the fitting structure 161 is a second inserting structure 1612, the second inserting structure 1612 includes a inserting column 16121, a clamping block 16123 is disposed at an end of the inserting column 16121, and as shown in fig. 26, the clamping block 16123 is disposed to make an end contour of the inserting column 16121 non-circular.

In contrast, the fixing structure 17 defines therein a groove 1721, the end of the groove 1721 has a reduced diameter 1722, and the reduced diameter 1722 is formed in a non-circular shape to fit the end of the post 16121. The term "reducer 1722" as used herein is defined as a non-circular shape that fits within the end of the post 16121, meaning that the end of the post 16121 conforms to the shape of the reducer 1722 when the handle 16 is in the first position, although the reducer 1722 is slightly larger than the end of the post 16121. The inner shape of the groove 1721 is not limited as long as the post 16121 can rotate to the second position after the post 16121 is inserted into the groove 1721, i.e., the inner part of the groove 1721 cannot interfere with the latch 16123 at the second position.

In the first position, the plug column 16121 can be inserted into the groove 1721 through the necking 1722, and in the second position, the fixture block 16123 is clamped on the inner side of the necking 1722.

Alternatively, as shown in fig. 22, 24, and 25, a coaxially disposed insertion hole 16122 is formed on the insertion column 16121, a connection column 1724 is formed in the groove 1721, and the connection column 1724 is inserted into the insertion hole 16122. The connecting post 1724 is engaged with the insertion hole 16122, so that the handle 16 is mounted on the housing 10 to guide the handle in the first position, and a rotation shaft is provided for rotating the handle 16 from the first position to the second position. In addition, when the handle 16 is rotated to the second position, the connecting column 1724 can be used as a bearing rod to play a certain supporting role.

Alternatively, as shown in fig. 22, 24 and 26, the outer contour of the end of the plug 16121 is half semicircular and half elliptic, and the constricted portion 1722 of the groove 1721 is half semicircular and half elliptic. Due to the arrangement, on one hand, the handle 16 is matched with the handle, and the handle is easy to identify and assemble; on the other hand, the half-oval shape of the post 16121 has a portion with the clip 16123, so that the profile is smooth and not easy to be stuck, and a stable supporting function is further facilitated, so that the handle 16 is not easy to be released from the outside of the housing 10.

In some embodiments of the present invention, as shown in fig. 8, the inner tube 30 is formed in a tubular shape with one end open and the other end closed, the inner tube 30 separates the built-in filter material installation cavity into an inner cavity and an outer cavity, the second filter set 40 is disposed in the inner cavity, because one side of the built-in filter material installation cavity is open, water flow can not only pass through the first filter set 20 and be filtered by the first filter set 20, but also can pass through the open inner cavity of the built-in filter material installation cavity, and is filtered by the second filter set 40, so that a series relation is formed between the first filter set 20 and the second filter set 40.

In some embodiments of the present invention, as shown in fig. 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 10 mm.

In some examples of the present invention, the second filtering set 40 is a roll made of non-woven fabric, polypropylene layer, and carbon fiber, and has a long service life. When the filter is used for filtering tap water, silt, rust and residual chlorine can be removed preliminarily. Of course, the second filter group 40 can also be made by rolling only one or two of the filter layers, and is not limited in particular.

The filter effect of just straining the filter core is relevant with the wall thickness of just straining the filter core, and the thicker filter effect of the wall of just straining the filter core is better, when the wall thickness of just straining the filter core is greater than 10mm, can satisfy the filtration requirement of user to rivers. The filtering effect of the reverse osmosis filter element is related to the area of the filter membrane wound. Consequently, inject built-in filter media installation cavity in the reverse osmosis filter core, establish the primary filter core in the reverse osmosis filter core, can reduce the volume of primary filter core when guaranteeing primary filter core filter effect, and then can reduce the occupation space of primary filter core, and can reduce the production material of primary filter core, and then can save the cost, and establish the reverse osmosis filter core in the outside of primary filter core, the diameter of reverse osmosis filter core is great, under the condition around establishing the same area filter membrane, can reduce the wall thickness of reverse osmosis filter core, can reduce the occupation space of reverse osmosis filter core equally.

From this, the first filter group 20 and the second filter group 40 of above-mentioned combination satisfy under the condition that compound filter element group spare 100 filtration required, occupation space is little, and the utilization efficiency of promotion casing 10 inner space that can the at utmost is favorable to dwindling compound filter element group spare 100's total volume, provides convenience for the user uses.

As shown in fig. 1, according to the composite filter element assembly 100 of an embodiment of the present invention, a tap water inlet 111, a purified water outlet 112, a purified water inlet 113 and a purified water outlet 114 are disposed on the housing 10, wherein the tap water inlet 111 and the purified water outlet 112 communicate with the built-in filter material installation cavity.

As shown in fig. 3, the outer wall of the first filter group 20 and the inner wall of the housing 10 define a first purified water chamber 51 communicating with the purified water inlet 113, the inner wall of the first filter group 20 and the outer wall of the inner pipe 30 define a purified water chamber 52 communicating with the purified water outlet 114, the inner wall of the inner pipe 30 and the outer wall of the second filter group 40 define a tap water chamber 53 communicating with the tap water inlet 111, and the second filter group 40 defines a second purified water chamber 54 communicating with the purified water outlet 112.

Water flows into the tap water cavity 53 through the tap water inlet 111, water in the tap water cavity 53 enters the second purified water cavity 54 through the filtering action of the second filtering group 40 and flows out through the purified water outlet 112, the flowing purified water enters the first purified water cavity 51 through the purified water inlet 113 through the action of the booster pump, water in the first purified water cavity 51 enters the purified water cavity 52 through the filtering action of the first filtering group 20, and water in the purified water cavity 52 flows out through the purified water outlet 114 for a user to drink.

Wherein, a gap is formed between the inner wall of the casing 10 and the outer wall of the first filtering set 20 to form a first uniform distribution flow channel, a gap is formed between the inner wall of the first filtering set 20 and the outer wall of the inner tube 30 to form a second uniform distribution flow channel, and a gap is formed between the inner wall of the inner tube 30 and the outer wall of the second filtering set 40 to form a third uniform distribution flow channel. Therefore, normal passing of water flow can be guaranteed, the volumes of the first filtering group 20 and the shell 10 can be reduced, and the space utilization efficiency is improved.

Moreover, utilize the cooperation of the inner wall of casing 10, the inner wall of first filter group 20, the outer wall of first filter group 20, the inner wall of inner tube 30, the outer wall of inner tube 30 and the outer wall of second filter group 40 to inject first water purification chamber 51, second water purification chamber 54, running water chamber 53 and pure water chamber 52, simple structure realizes easily, is favorable to simplifying the structural design of compound filter element subassembly 100, can reduce the manufacturing cost of compound filter element subassembly 100 moreover.

As shown in fig. 4, in some embodiments of the present invention, the first filter group 20 includes: the filter comprises a central tube 21, a reverse osmosis filter membrane 22 and an annular inner cover 23, wherein the central tube 21 extends along the axial direction of the shell 10, the upper end of the central tube 21 is opened to define a built-in filter material installation cavity, the inner tube 30 is arranged in the central tube 21, a 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 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, the inner peripheral edge of the annular inner cover 23 is in sealing butt joint 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 face of the reverse osmosis filter membrane 22.

Further, as shown in fig. 9-11, a waste water opening 232 is formed in the annular inner cover 23, a waste water groove with an open lower surface is defined in the annular inner cover 23, the waste water groove extends along the circumferential direction of the annular inner cover 23, the upper end surface of the reverse osmosis filter membrane 22 and the annular inner cover 23 are matched to seal the waste water groove to form a waste water cavity 231, and a waste water channel for communicating the waste water cavity 231 with the waste water outlet 115 is defined in the annular inner cover 23.

The reverse osmosis filter core separates out waste water at filtering process, can guide waste water to discharge through setting up waste water mouth 232, waste water chamber 231 and waste water passageway. The waste water chamber 231 is defined on the annular inner cover 23, so that the waste water can be prevented from being mixed into the first purified water chamber 51, the pure water chamber 52, the tap water chamber 53 and the second purified water chamber 54, and the quality of the filtered water flow can be improved. And the waste water of reverse osmosis filter core discharges from the tip of reverse osmosis filter core, inject waste water chamber 231 on annular inner cup 23, can provide convenience for waste water gets into waste water chamber 231, and simple structure has eliminated the water conservancy diversion passageway between reverse osmosis filter core and the waste water chamber 231 moreover, has simplified the structural design and the water route design of compound filter core subassembly 100.

Wherein, the top of casing 10 is equipped with the waste water outlet 115 of intercommunication waste water mouth 232, and waste water in the waste water chamber 231 passes through waste water outlet 115 and discharges, is equipped with the waste water valve on the waste water outlet 115, waste water valve and casing 10 integrated into one piece, and when waste water in the waste water chamber 231 reaches certain pressure, the waste water valve is opened, and waste water discharges.

As shown in fig. 7 and 8, in some embodiments of the present invention, the second filter group 40 is a primary filter element, and the second filter group 40 includes: support skeleton 41 and preliminary filter membrane 42, support skeleton 41 is located the inner tube 30 and extends along the axial of inner tube 30, and preliminary filter membrane 42 cover is established on support skeleton 41 and extends along the axial of support skeleton 41, and preliminary filter membrane 42 is the tubulose filter piece that polymerized aluminium chloride material preparation formed, and preliminary filter membrane 42's thickness is greater than 10 mm.

Wherein, the support framework 41 internally defines a second purified water cavity 54, the outer wall of the primary filter membrane 42 and the inner wall of the inner tube 30 define a tap water cavity 53, tap water enters the tap water cavity 53 through the tap water inlet 111, and water flows through the primary filter membrane 42 and flows out from the inner wall of the support framework 41 through the filtering action of the primary filter membrane 42 to enter the second purified water cavity 54 and then flows out from the purified water outlet 112.

Because the filtration effect of the primary filtration membrane 42 is related to the thickness of the water flow passing through the primary filtration membrane 42, the primary filtration membrane 42 and the support framework 41 form the second filtration group 40 and are arranged in the inner tube 30, the diameter of the second filtration group 40 is reduced, the occupied space of the second filtration group 40 can be further reduced, the volume and production materials of the primary filtration membrane 42 can be reduced, and the cost is reduced.

Alternatively, as shown in fig. 5, the supporting framework 41 is tubular, and a plurality of holes penetrating through the wall of the supporting framework 41 along the thickness direction of the wall of the supporting framework 41 are formed on the wall of the supporting framework 41. By providing holes in the wall of the support framework 41, the flow of water in the primary filter membrane 42 is promoted to pass through the holes into the second clean water chamber 54.

As shown in fig. 3 and 8, in some embodiments of the present invention, the second filtering group 40 further includes: a second inner end cap 43 and an end plate 44, wherein the second inner end cap 43 is sleeved on the upper end of the support framework 41, the lower surface of the second inner end cap 43 is in sealing contact with the upper end surface of the primary filter membrane 42, the end plate 44 is sleeved on the lower end of the support framework 41, and the upper surface of the end plate 44 is in sealing contact with the lower end surface of the primary filter membrane 42.

Through setting up second inner end cover 43 and end plate 44, can promote the leakproofness of primary filter membrane 42 upper end and lower extreme, prevent that the rivers in the primary filter membrane 42 from flowing out from the upper end or the lower extreme of primary filter membrane 42, not only can prevent that rivers from getting into out water cavity 521, can promote the leakproofness of running water cavity 53 moreover.

As shown in fig. 8, in some embodiments of the present invention, the outer periphery of the second inner end cap 43 is formed with an upward flange folded downward, the inner wall of the upward flange abuts against the outer peripheral wall of the primary filter membrane 42, a tap water channel is defined by the outer wall of the upward flange and the inner wall of the inner tube 30, and water flows from the tap water inlet 111 into the tap water chamber 53 through the tap water channel.

Be equipped with on the periphery of end plate 44 along keeping off gluey ring 441, keep off gluey ring 441 and include: the connection ring extends along the circumferential direction of the end plate 44 and is connected with the outer circumferential edge of the end plate 44, the sealing ring is arranged around the end plate 44 and extends along the axial direction of the end plate 44, the lower circumferential edge of the sealing ring is connected with the outer circumferential edge of the connection ring, and the inner circumferential wall of the sealing ring is in sealing abutment with the outer circumferential wall of the primary filter membrane 42.

Therefore, the performance of the second filter group 40 can be improved, the tightness and reliability of the tap water cavity 53 can be improved, and water leakage can be prevented.

In some embodiments of the present invention, as shown in fig. 3, fig. 4, fig. 5, fig. 7, and fig. 8, the present invention further includes: and the third filter group 50 is arranged in the pure water cavity 52, the pure water cavity 52 is divided into an original pure water cavity 522 positioned outside the third filter group 50 and a water outlet cavity 521 positioned in the third filter group 50 by the third filter group 50, and the water outlet cavity 521 is communicated with the pure water outlet 114.

That is to say, the pure water filtered by the first filtering set 20 enters the original pure water chamber 522, the water in the original pure water chamber 522 passes through the third filtering set 50, and enters the water outlet chamber 521 through the filtering action of the third filtering set 50, and the hollow activated carbon rod is selected as the third filtering set 50, so as to further filter the peculiar smell, organic matters, colloid, iron, residual chlorine and the like in the water body. Wherein, first filter bank 20 is the reverse osmosis filter core, and the water after the reverse osmosis filter core filters becomes the faintly acid, and the taste is relatively poor, is unsuitable for the user to directly drink, through the filtering action of heart-alive carbon filter core, can further promote the quality of pure water, has promoted the taste of drinking water.

Moreover, establish third filter group 50 in pure water cavity 52, can further promote compound filter element group 100's compound degree, promoted the filtering action of compound filter element group 100 to rivers, set up third filter group 50 alone moreover, not only can simplify compound filter element group 100's rivers design, can also reduce compound filter element group 100's volume.

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, a built-in filter material installation cavity extending along the axial direction of the first filter group 20 is defined in the first 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 is disposed at the bottom of the built-in filter material installation cavity, and the inner tube 30 is disposed at the top of the third filter group 50.

Along the third filter group 50 and the inner tube 30 of the inside built-in filter media installation cavity axial arrangement of first filter group 20, can make full use of the space of built-in filter media installation cavity, be favorable to dwindling the internal diameter of built-in filter media installation cavity, and then can dwindle the diameter and the volume of first filter group 20, the third filter group 50 and the inner tube 30 simple structure of above-mentioned structure in addition, convenient assembling.

In some embodiments of the present invention, as shown in fig. 3, 4 and 8, the composite filter element assembly 100 further includes a water outlet pipe 60, the water outlet pipe 60 axially penetrates through the inner pipe 30 along the inner pipe 30, the water outlet pipe 60 is inserted into the supporting framework 41, one end (the lower end shown in fig. 8) of the water outlet pipe 60 is communicated with the water outlet chamber 521, the other end (the upper end shown in fig. 8) of the water outlet pipe 60 is communicated with the pure water outlet 114, and a second pure water chamber 54 is defined between the inner wall of the supporting framework 41 and the outer wall of the water outlet pipe 60.

In some embodiments of the present invention, the pure water outlet 114 is located above the inner tube 30, the water outlet chamber 521 is located in the third filtering set 50 and below the inner tube 30, and by providing the water outlet pipe 60, the water flow in the water outlet chamber 521 can flow out from the pure water outlet 114 conveniently, and the water outlet pipe 60 has a simple structure and is easy to implement.

In some embodiments of the present invention, as shown in fig. 13 and 14, the central tube 21 includes: the filter comprises a surrounding plate 211 and a lower cover plate 212, wherein the surrounding plate 211 is in a cylindrical shape with two open ends, the reverse osmosis filter membrane 22 is sleeved on the surrounding plate 211, the lower cover plate 212 is arranged in the surrounding plate 211 and is positioned at the lower part of the surrounding plate 211, the lower cover plate 212 closes the opening at the lower end of the surrounding plate 211 and is matched with the surrounding plate 211 to define a built-in filter material installation cavity, and the lower end of the third filter group 50 is abutted to the upper surface of the lower end. That is, the center tube 21 is formed in a cylindrical shape having 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 tube 30 cooperate to define the pure water chamber 52.

The wall of the central tube 21 is formed with pure water passing holes 2111, the pure water passing holes 2111 penetrate the wall of the central tube 21 in the thickness direction of the wall of the central tube 21, the water flow enters the reverse osmosis membrane 22 from the lower end of the reverse osmosis membrane 22, the reverse osmosis membrane 22 filters the water flow to separate the water flow into wastewater and pure water, and the wastewater flows out from the upper end of the reverse osmosis membrane 22 and is discharged through the wastewater chamber 231 and the wastewater outlet 115. 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-holes 2111, and is discharged through the pure water outlet 114 for the user to drink.

As shown in fig. 12, a water guide groove 2112 communicating with the pure water passage 2111 is formed in the outer peripheral wall of the shroud 211, the water guide groove 2112 is recessed inward with respect to the outer peripheral wall of the shroud 211, and the water filtered by the reverse osmosis membrane 22 flows into the pure water passage 2111 through the water guide groove 2112, is collected in the filter medium installation chamber, and is then discharged.

Because reverse osmosis filter membrane 22 is around establishing on bounding wall 211, through set up guiding gutter 2112 on bounding wall 211, can increase the flow efficiency of leading out rivers in reverse osmosis filter membrane 22, increase reverse osmosis filter membrane 22's play water efficiency, and then can promote reverse osmosis filter core subassembly's water purification efficiency.

As shown in fig. 12, the water chute 2112 extends along the circumferential direction of the surrounding plate 211, that is, the water chute 2112 is formed into an annular shape extending along the circumferential direction of the surrounding plate 211, and the pure water through holes 2111 are formed in the water chute 2112, so that the length of the water chute 2112 can be further increased, the water outlet efficiency of the reverse osmosis filter membrane 22 is further improved, the uniform water outlet efficiency of the reverse osmosis filter membrane 22 in the circumferential direction can be ensured, and the influence of the partial water outlet on the water purification efficiency of the reverse osmosis filter membrane 22 due to the obstruction of the partial water outlet can.

The lower end of the central tube 21 with the structure is closed, so that the leakage of pure water flow from the lower end of the pure water cavity 52 can be prevented, and in the assembling process of the reverse osmosis filter element, only the tightness of the upper end of the central tube 21 needs to be noticed. The structure of the lower end closed and the structure of the inner tube 30 and the third filter group 50 axially arranged, so that the inner tube 30 can be detachably arranged in the built-in filter material installation cavity, that is, the inner tube 30 and the third filter group 50 can be detached from or installed on the support platform 213 of the lower cover plate 212 together.

As shown in fig. 13 and 14, in some embodiments of the present invention, the inner wall of the shroud 211 is formed with a support platform 213 protruding radially inward along the shroud 211, the support platform 213 has an upper surface, the lower end of the inner tube 30 abuts against the upper surface of the support platform 213, and the third filter group 50 is disposed below the inner tube 30 and inside the support platform 213.

Through set up on bounding wall 211 with inner tube 30 complex brace table 213, can provide convenience for the assembly of inner tube 30, brace table 213 can promote the assembly stability of inner tube 30 to the supporting role of inner tube 30, can reduce the squeezing action of inner tube 30 to third filter group 50 in addition, prevents that inner tube 30 pressure from too big causing the damage to third filter group 50, is favorable to prolonging the life of third filter group 50.

Alternatively, as shown in fig. 13, the support table 213 extends in the circumferential direction of the shroud 211, that is, the support table 213 is formed in a ring shape extending in the circumferential direction of the shroud 211, the support table 213 may also be formed in a tubular shape extending in the axial direction of the shroud 211, the lower end of the support table 213 abuts against the upper surface of the lower end cap of the center tube 21, and the third filter group 50 is disposed inside the support table 213.

The tubular support table 213 can improve the force uniformity of the inner tube 30, and prevent the inner tube 30 from being damaged or inclined due to uneven local force. Wherein, the supporting bench 213, bounding wall 211 and lower extreme cover integrated into one piece, that is to say, center tube 21 is integrated into one piece, integrated into one piece's center tube 21 can promote supporting bench 213, the stability of being connected and joint strength between bounding wall 211 and the lower extreme cover, and then can promote center tube 21's functional stability and reliability, and can eliminate supporting bench 213, the coupling mechanism between bounding wall 211 and the lower extreme cover, the assembly efficiency of center tube 21 and compound filter element group spare 100 has been promoted, and integrated into one piece's center tube 21's intensity is big, long service life.

In some embodiments of the present invention, as shown in fig. 6, the housing 10 includes: the bottom of the cylinder body 11 is opened, the first filtering group 20 is arranged in the cylinder body 11, the tap water inlet 111, the purified water outlet 112, the purified water inlet 113 and the purified water outlet 114 are all arranged at the top of the cylinder body 11, the lower cover 12 is connected with the cylinder body 11 to seal the opening of the cylinder body 11, and the upper surface of the lower cover 12 is in sealing butt joint with the lower end surface of the first filtering group 20.

Wherein, still be equipped with four adapter 13 on the casing 10, four adapter 13 one-to-one pegs graft in running water entry 111, water purification export 112, water purification entry 113 and pure water export 114, provides convenience for compound filter element subassembly 100 assembly water route through setting up adapter 13, has promoted the leakproofness in water route moreover.

As shown in fig. 15, a waste water plug 14 is disposed at the waste water outlet 115, the waste water plug 114 is inserted into the waste water outlet 115, the waste water plug 14 generates a certain resistance to water in the waste water chamber 231, when the water pressure in the waste water chamber 231 reaches a predetermined pressure value, the waste water plug 14 is conducted, and waste water is discharged from the waste water chamber 231.

In some embodiments of the present invention, the waste plug 14 includes: a sleeve inserted in the waste water outlet 115 and connected to the housing 10, and a plurality of capillaries provided on an inner wall of the sleeve and extending radially inward of the sleeve.

The number of the capillaries is large, the capillaries are arranged along the circumferential direction of the sleeve to form a capillary group, and the capillary group is filled in the sleeve along the axial direction of the sleeve. The waste water plug 14 with the structure has the advantages of simple structure and easy 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 sleeve includes: the waste water treatment device comprises an insertion section 141 and a guide section 142, wherein one end of the insertion section 141 is inserted into the waste water outlet 115, the insertion section 141 extends along the axial direction of the waste water outlet 115, and the guide section 142 is communicated with the other end of the insertion section 141. Capillaries are arranged in the insertion section 141 and the guide section 142, or the capillaries can be arranged only in the insertion section 141 or the guide section 142.

The sleeve pipe of above-mentioned structure not only can increase the water pressure in waste water chamber 231, and grafting section 141 pegs graft in waste water outlet 115 moreover, and stability and leakproofness are better, and direction section 142 is suitable for intercommunication waste water outlet 1115 and waste water drainage pipe, and wherein, direction section 142 perpendicular to grafting section 141 makes things convenient for waste water drainage pipe to connect direction section 142, can provide convenience for waste water discharges.

Wherein, still be equipped with on the casing 10 and decorate lid 15, decorate lid 15 cover and establish the top at barrel 11, running water entry 111, water purification export 112, water purification entry 113, pure water export 114 and waste water export 115 all cover and establish in decorating lid 15, have promoted the outward appearance regularity of compound filter element group spare 100 from this.

In the assembly process of the composite filter element assembly 100, the reverse osmosis filter membrane 22 is firstly wound on the central tube 21, then the third filter group 50 is arranged in the built-in filter material installation cavity, then the inner tube 30 is assembled in the built-in filter material installation cavity, the lower end of the inner tube 30 abuts against the third filter group 50, then the water outlet tube 60 is inserted in the inner tube 30, then the second filter group 40 is sleeved on the water outlet tube 60, finally the annular inner cover 23 is covered on the central tube 21, and the water outlet tube 60 and the second inner end cover 43 extend out of the middle part of the annular inner cover 23. Then the first filtering set 20 is inserted into the cylinder 11, a first water channel, a second water channel, a third water channel, a fourth water channel and a fifth water channel are arranged on the top wall of the inner cavity of the cylinder 11, the first water channel is communicated with a pure water outlet 114 and a water outlet pipe 60, one end of the second water channel is communicated with a tap water inlet 111, and the other end of the second water channel is communicated with a channel between the outer peripheral wall of the second inner end cover 43 and the inner peripheral wall of the annular inner cover 23; one end of the third water channel is communicated with the purified water outlet 112, the other end of the third water channel is communicated with a 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 is communicated with the purified water inlet 113, the other end of the fourth water channel is communicated with a channel between the outer peripheral wall of the reverse osmosis filter membrane 22 and the inner peripheral wall of the cylinder body 11, and the fifth water channel is communicated with the waste water outlet 115 and.

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 tube 30, and the central axis of the water outlet tube 60 coincide with the central axis of the housing 10. That is to say, outlet pipe 60, second filter group 40, inner tube 30, first filter group 20 and casing 10 are nested in proper order and are set up, can reduce the occupation space of outlet pipe 60, second filter group 40, inner tube 30 and first filter group 20 from this, have promoted the utilization efficiency of compound filter element group 100 inner space, and then can reduce the volume of casing 10, provide convenience for compound filter element group 100's use and assembly.

To better understand the aspects of the embodiments of the present invention, the structure of the composite filter element assembly 100 in one embodiment of the present invention is described below with reference to fig. 1-26.

The following embodiments describe the three-stage filtration function of the composite filter element assembly 100 by taking purified tap water as an example, and describe the highly integrated design structure of the composite filter element assembly 100 and the handle 16 of the composite filter element assembly 100 for easy access. In addition, the second filter group 40 is exemplified by a roll-type primary filter member formed by rolling a nonwoven fabric, a polypropylene layer, carbon fibers, and a support frame 41; the first filtration group 20 is illustrated with a reverse osmosis cartridge as the intermediate filtration. The third filtration group 50 is illustrated by taking a cylindrical hollow carbon rod as an example of the final stage filtration.

As shown in fig. 1-15, 16, 18, 21, 23, a composite filter element assembly 100 is installed with the entire composite filter element assembly 1000 in a normally upright position. The composite filter element assembly 100 comprises: housing 10, first filter group 20, inner tube 30, second filter group 40, third filter group 50, securing structure 17, handle 16. A filter cavity is defined in the housing 10, the first filter group 20 is arranged in the filter cavity, and a built-in filter material installation cavity with one open side is defined in the first filter group 20. The inner tube 30 is detachably arranged in the built-in filter material installation cavity, and 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 a first purified water chamber 51 communicating with the purified water inlet 113, the inner wall of the first filter group 20 and the outer wall of the inner pipe 30 define a purified water chamber 52 communicating with the purified water outlet 114, the inner wall of the inner pipe 30 and the outer wall of the second filter group 40 define a tap water chamber 53 communicating with the tap water inlet 111, and the second filter group 40 defines a second purified water chamber 54 communicating with the purified water outlet 112. The upper portion of the housing 10 is further provided with a waste water port 232 communicating with the first filtering group 20.

Specifically, the inner tube 30 and the third filter group 50 are arranged in the built-in filter material installation cavity axially forwards and backwards, a pure water cavity 52 is formed inside the central tube 21 in the first filter group 20, and the pure water cavity 52 is divided into an external raw pure water cavity 522 and an internal water outlet cavity 521 by the third filter group 50. One end of the water outlet pipe 60 is communicated with the pure water outlet 114, and the other end of the water outlet pipe 60 penetrates through the inner pipe 30 along the axial direction of the inner pipe 30, extends out of the inner pipe 30, extends into the supporting framework 41 of the third filtering group 40, and is communicated with the water outlet cavity 521. The upper portion of the housing 10 is provided with a fixing structure 17 at both ends thereof adjacent to the decorative cover 15. The handle 16 is generally arcuate and may pass over the trim cover 15 or be located on one side of the housing 10.

As shown in fig. 16-26, handle 16 is provided with an engaging structure 161, and engaging structure 161 is rotatably engaged with fixing structure 17. The engagement structure 161 has a first position and a second position in the direction of rotation relative to the fixed structure 17,

in the first position, the handle 16 is perpendicular to the axis of the housing 10, and the engaging structure 161 is removably connected to the fixing structure 17.

In the second position, the handle 16 is pivoted to the upper portion of the decorative cover 15, and the engagement structure 161 is pivoted in the fixing structure 17 and is engaged to form an anti-disengagement structure, so that a person can conveniently lift the handle 16 to lift the whole composite filter element assembly 100.

The whole process of filtering the tap water is that the tap water enters the tap water chamber 53 from the tap water inlet 111, flows to the radial inner side, enters the second purified water chamber 54 through the filtering action of the second filtering set 40, and flows out through the purified water outlet 112. The flowing purified water enters the first purified water cavity 51 through the purified water inlet 113 under the action of the booster pump, the water in the first purified water cavity 51 enters the original pure water cavity 522 through the filtering action of the first filtering group 20, the water in the original pure water cavity 522 enters the water outlet cavity 521 after being filtered by the third filtering group 50, and then is guided upwards from the water outlet pipe 60 and flows out from the pure water outlet 114 for the user to drink.

In addition, the utility model discloses a fixed knot on handle 16's cooperation structure 161 and the casing 10 constructs 17, also can be used in other kinds of filter element group spare, like the filter core bottle of single filter core to and the filter element group spare of combined type, do not confine the utility model provides a compound filter element group spare 100.

In the description of the present invention, it is to be understood that the terms "center", "lateral", "length", "width", "thickness", "upper", "lower", "vertical", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

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

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Three filter banks are shown in fig. 3 for illustrative purposes, but it will be apparent to those skilled in the art after reading the above technical solutions that the solution can be applied to two or more filter banks, which also falls within the protection scope of the present invention.

The specific structure and filtration principles of other components of the composite cartridge assembly 100 according to embodiments of the present invention, such as reverse osmosis cartridges, are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite filter element assembly, comprising:

a housing;

the first filter group is arranged in the shell, and a built-in filter material installation cavity is defined in the first filter group;

the inner pipe is detachably arranged in the built-in filter material mounting cavity;

a second filter bank disposed within the inner tube;

a fixed structure provided on the housing;

the handle, be equipped with the cooperation structure on the handle, the cooperation structure can with fixed knot constructs normal running fit, the cooperation structure is relative fixed knot constructs first position and second position on the rotation direction has, when the first position the cooperation structure can take out to insert to be connected on the fixed knot constructs, when the second position the cooperation structure with the fixed knot constructs the block and forms anti-disengaging structure.

2. The composite filter element assembly according to claim 1, wherein the mating structure is a first plug structure, the first plug structure comprises a shaft sleeve with an open end, a guide groove is formed on an inner wall of the shaft sleeve, the guide groove is open at one open end of the shaft sleeve, and a clamping hole is formed on one side of the guide groove on the shaft sleeve;

the fixing structure comprises a guide post and a limiting post connected to the peripheral wall of the guide post; wherein,

when the first position, the guide post can be inserted the axle sleeve simultaneously spacing post can be inserted the guide way, when the second position spacing post joint is in the card hole.

3. The composite filter element assembly according to claim 2, wherein the guide slot extends in an axial direction of the bushing or the guide slot extends helically in a direction from an end to the card hole.

4. The composite filter element assembly of claim 2, wherein the guide slot and the snap hole both extend through the sleeve in a thickness direction of the sleeve.

5. The composite filter element assembly of claim 1, wherein the mating structure is a second plug-in structure comprising a plug-in post having a fixture at an end thereof such that the end of the plug-in post is non-circular;

a groove is defined in the fixing structure, a necking is formed at the end part of the groove, and the necking is formed into a non-circular shape matched with the end part of the inserting column; and,

when the plug is at the first position, the plug column can be inserted into the groove through the necking, and when the plug column is at the second position, the clamping block is clamped on the inner side of the necking.

6. The composite filter element assembly of claim 5, wherein the post is provided with a coaxial socket, and the groove is provided with a connecting post inserted into the socket.

7. The composite filter element assembly according to claim 5, wherein the outer contour shape of the end of the post is semi-circular in half and semi-elliptical in half, and the shape of the throat of the groove is semi-circular in half and semi-elliptical in half.

8. The composite filter element assembly according to any of claims 1-7, wherein the end of the housing is provided with a tap water inlet, a purified water outlet, a purified water inlet and a purified water outlet;

the outer wall of the first filtering group and the inner wall of the shell define a first purified water cavity communicated with the purified water inlet;

the inner wall of the first filtering group and the outer wall of the inner pipe define a pure water cavity communicated with the pure water outlet;

the inner wall of the inner pipe and the outer wall of the second filtering group define a tap water cavity communicated with the tap water inlet;

and a second purified water cavity communicated with the purified water outlet is defined in the second filtering group.

9. The composite filter element assembly of claim 8, wherein the first filter group comprises:

the built-in filter material installation cavity is arranged in the central tube, and a pure water through hole is formed in the wall of the central tube;

the reverse osmosis filter membrane is sleeved on the central tube;

the annular inner cup, annular inner cup cover is established on the center tube, the interior week edge of annular inner cup with the upper end edge of inner tube links to each other, just the lower terminal surface of annular inner cup with the up end of reverse osmosis filter membrane ends.

10. The composite filter element assembly of claim 8, wherein the annular inner cover defines a downwardly open waste tank therein, the upper end surface of the reverse osmosis membrane cooperates with the annular inner cover to close the waste tank to form a waste chamber, the top of the inner cover is provided with a waste water port communicating with the waste water chamber, and the top of the housing is provided with a waste water outlet communicating with the waste water port.

11. The composite filter element assembly of claim 8, further comprising:

the third filtering group is arranged in the pure water cavity, and the third filtering group and the inner pipe are arranged along the axial direction of the first filtering group; the third filtering group divides the pure water cavity into an original pure water cavity outside the third filtering group and a water outlet cavity inside the third filtering group, and the water outlet cavity is communicated with the pure water outlet.

12. The composite filter element assembly of claim 8, further comprising:

the water outlet pipe penetrates through the inner pipe along the axial direction of the inner pipe, one end of the water outlet pipe is communicated with the water outlet cavity, and the other end of the water outlet pipe is communicated with the pure water outlet.