CN111115869A

CN111115869A - Composite filter element assembly

Info

Publication number: CN111115869A
Application number: CN201811289176.8A
Authority: CN
Inventors: 李杨敏; 桂鹏; 莫祖栋
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: 2020-05-08

Abstract

The invention discloses a composite filter element assembly, which comprises: the filter comprises a shell, a first filter group and a second filter group. Divide into first chamber and the second chamber that holds along length direction in the casing, two hold the chamber and separate by the cab apron, are equipped with the transition mouth on the cab apron, and the second holds intracavity water pressure and is greater than first intracavity water pressure that holds, and at least one business turn over mouth department is equipped with stagnant water structure on the casing. The first filter group is arranged in the first accommodating cavity. The second filter group is arranged in the second accommodating cavity. The water stopping structure comprises a water stopping concave platform, a water stopping core and a water stopping spring. The water stopping concave station is connected to the shell; the water stopping core can move between a cut-off position and a conducting position, the water stopping structure blocks the inlet and the outlet at the cut-off position, and the inlet and the outlet are communicated with the inside of the shell at the conducting position; the water stopping spring is connected between the water stopping concave platform and the water stopping core, and the water stopping spring drives the water stopping core to move towards the cut-off position. The composite filter element assembly provided by the embodiment of the invention has the advantages of high integration level and convenience in use.

Description

Composite filter element assembly

Technical Field

The invention belongs to the technical field of water purification, and particularly relates to a composite filter element assembly.

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 the filtering effect of the composite filter element assembly, a plurality of filter element assemblies are generally arranged in the water purifier, water inlets and water outlets between the filter element assemblies are sequentially connected in series, and a water inlet cavity and a water outlet cavity are respectively formed on two sides of different filter elements. In order to reach the drinking water of high quality, often need establish ties tertiary, level four filter element group spare, all need the external pipe to connect between delivery port and the water inlet between the different filter element group spares, make compound filter element group spare pipe-line system numerous and diverse, purifier complete machine occupation space is great, inconvenient installation and renew cartridge.

If set up the stagnant water valve at business turn over mouth, can reduce the risk of leaking. The plugging part and the water stop opening part of the existing water stop valve structure are not tightly matched, the assembly structure of the water stop valve is simpler, the water leakage phenomenon is easy to occur, and the service life is shortened.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the composite filter element assembly provided by the invention has the advantages of high integration level, convenience in use and high reliability.

A composite filter element assembly according to an embodiment of the invention comprises: the water-stopping device comprises a shell, wherein a first accommodating cavity and a second accommodating cavity are separated from each other in the shell along the length direction, the first accommodating cavity and the second accommodating cavity are separated from each other through a transition plate, a transition port is formed in the transition plate, the water pressure in the second accommodating cavity is greater than the water pressure in the first accommodating cavity, and a water-stopping structure is arranged at least one inlet and outlet on the shell; the first filtering group is arranged in the first accommodating cavity; and the second filtering group is arranged in the second accommodating cavity.

According to the composite filter element assembly provided by the embodiment of the invention, the two filter groups are integrally installed in the shell, so that the filter function is diversified, and the filter effect of tap water is improved. The integration level is high, whole small, has greatly reduced the required space when installing. The external pipelines required when two groups of filter groups are connected are reduced, so that the overall arrangement of the composite filter element assembly is compact, and the material cost is saved to a certain extent. The transition plate can also support the filter groups on two sides, so that the filter groups are not easy to deflect in the long-term use process. Adopt the cab apron to separate into two different chambeies that hold of water pressure in with the casing, aim at will require different filter part to water pressure to arrange two in holding the chamber in, reduce the partial assembly requirement that water pressure requires lowly like this, require high partial assembly requirement to water pressure to improve, the water under high pressure can not influence the leakproofness and the structural reliability of low pressure part, whole assembly cost also can suitably reduce. The water stopping structure is arranged at least one inlet and outlet, so that the external pipeline joint can be effectively connected with the inlet and outlet, and the water flow inside and outside the inlet and outlet is in a conducting state. When the external pipeline joint is removed, the water stopping structure has a plugging effect on the inlet and the outlet, and the reliability of water stopping at the inlet and the outlet is improved.

According to an embodiment of the invention, the composite filter element assembly, the water stopping structure comprises: the water stopping concave table is connected to the shell; the water stopping core can move between a cut-off position and a conduction position, the water stopping structure blocks the inlet and the outlet at the cut-off position, and the inlet and the outlet are communicated with the inside of the shell at the conduction position; the water stopping spring is connected between the water stopping concave platform and the water stopping core, and the water stopping spring normally drives the water stopping core to move towards the cut-off position.

According to a further embodiment of the present invention, the water stopping structure includes: the water stopping sealing ring is sleeved on the water stopping core, and the water stopping core is in contact with the shell when in a cut-off position.

According to another embodiment of the invention, a chamfer is arranged at one end of the inlet and the outlet facing the water stopping concave table, and when the water stopping core is at the cut-off position, the water stopping sealing ring is in contact with the chamfer.

According to the composite filter element assembly disclosed by the embodiment of the invention, the shell is internally provided with a matching flange around the inlet and the outlet, at least part of the water stopping concave table is positioned on the inner side of the matching flange, and the water stopping concave table is connected to the matching flange in a welding mode.

According to a further embodiment of the present invention, the inner circumferential surface of the fitting flange is formed as a multistage fitting stepped surface, the outer circumferential surface of the water stopping recessed table is provided with a water stopping stepped surface adapted to the fitting stepped surface, the convex angle of the fitting stepped surface faces the concave angle of the water stopping stepped surface, and the concave angle of the fitting stepped surface faces the convex angle of the water stopping stepped surface; and an interference bump is arranged between at least one opposite reentrant corner and the convex corner, and the interference bump is a concentrated welding and melting area.

According to a further embodiment of the present invention, a flash groove is provided on the surface of the water stopping step adjacent to the concentrated welding region.

According to the composite filter element assembly provided by the embodiment of the invention, the second accommodating cavity is positioned below the first accommodating cavity, the water pressure in the second accommodating cavity is greater than that in the first accommodating cavity, and the water stopping structures are arranged at the inlet and outlet at the bottom of the second accommodating cavity.

According to one embodiment of the invention, the second filter group comprises: a reverse osmosis membrane element, the reverse osmosis membrane element comprising: the reverse osmosis membrane water purifier comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water collecting tubes arranged at intervals, the waste water collecting tubes are arranged around the central tube, filter water inlet holes are formed in the tube wall of the central tube, and waste water inlet holes are formed in the tube wall of the waste water collecting tubes; the reverse osmosis membrane bags have a first portion located inside the center tube bank and a second portion located outside the center tube bank, each of the waste headers and the center tube being separated by at least one of the first portions of the reverse osmosis membrane bags, the second portions of the reverse osmosis membrane bags forming a multi-layered membrane module around the center tube bank.

According to an embodiment of the present invention, the housing is provided with a first inlet/outlet, a second inlet/outlet, and a third inlet/outlet, the first filter group includes a first filter element, a second filter element, and a water path partition plate, the water path partition plate is disposed in the first accommodating chamber, the water path partition plate partitions the first accommodating chamber into a first low pressure region and a second low pressure region, the first filter element is disposed in the first low pressure region, water flowing from the first inlet/outlet flows out from the second inlet/outlet after passing through the first filter element, the second filter element is disposed in the second low pressure region, and water flowing from the transition port flows out from the third inlet/outlet after passing through the second filter element.

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 diagram of the internal structure of a composite filter element assembly according to one embodiment of the present invention.

FIG. 2 is a bottom view of a composite filter element assembly according to one embodiment of the present invention.

Fig. 3 is a schematic diagram of the internal structure of fig. 1 without the first filter element, the second filter element and the third filter element.

FIG. 4 is a schematic view of a composite filter element assembly with an internal filter group omitted according to one embodiment of the invention.

Fig. 5 is a partially enlarged schematic view of the structure in the region I in fig. 1.

Fig. 6 is a partially enlarged view of the structure in region ii of fig. 5.

Fig. 7 is a schematic view of the sealing ring in fig. 5, which is an annular sealing ring.

Fig. 8 is a schematic view of the ring seal of fig. 5 with a chamfer.

Fig. 9 is a schematic view showing the structure of a fitting flange of a second bottle cap according to an embodiment of the present invention.

Fig. 10 is a schematic sectional view of the water inlet, the mating flange and the water stop recessed table according to an embodiment of the present invention.

FIG. 11 is a schematic bottom view of a transition plate of a composite filter element assembly according to one embodiment of the present invention.

FIG. 12 is a schematic top view of a transition plate of a composite filter element assembly according to one embodiment of the invention.

FIG. 13 is a top view of a third endcap of one embodiment of the present invention.

FIG. 14 is a bottom view of a third endcap of one embodiment of the present invention.

FIG. 15 is a bottom view of a fourth endcap of one embodiment of the present invention.

FIG. 16 is a top view of a fourth endcap of one embodiment of the present invention.

Figure 17 is a schematic perspective view of a central pipe and waste header of one embodiment of the present invention.

FIG. 18 is a top view of a reverse osmosis membrane bag in combination with a center tube and waste header in accordance with one embodiment of the present invention.

FIG. 19 is a top view of a reverse osmosis membrane element according to one embodiment of the invention.

Reference numerals:

a composite filter element assembly 1000;

a first accommodation chamber 100; a first filter bank 1001; a first low-voltage region 1002; a second low-voltage region 1003;

a first filter member 10; a first uniform distribution flow channel 11; a second uniform distribution flow channel 12;

a first port 101; a second port 102;

a second filter member 20; a third uniform distribution flow channel 21; a fourth equispaced flow passage 22;

a third inlet and outlet port 201;

a first end structure 401; a second end structure 402;

a first inner end cap 41;

a first outer end cap 42; a first cannula 421;

a second inner end cap 43; an inner port 431; a fifth cannula 432;

a second outer end cap 44; an outer port 441; a sixth cannula 442;

a second middle end cap 45; a middle port 451; a seventh cannula 452;

a waterway partition plate 46;

a spacer bracket 49;

the second receiving chamber 200; a second filtration group 2001; a high pressure zone 2002;

a third filter member 30; fifth evenly distributed runners 31; a reverse osmosis membrane bag 32; a center tube 33; a waste water header 34;

a fifth port 301; a fourth port 302;

a third end structure 47; a second cannula 471; a third cannula 472; the first positioning projection 473; a first shaft boss 474;

a fourth end structure 48; a fourth cannula 481; a waste outlet 482; a second positioning projection 483; a second dead axle projection 484;

a housing 300;

a bottle cap 3001;

a first cap 310; a first adapter 311; a second adapter 312; a third adapter 313; a handle 314;

a second bottle cap 320; the fourth adapter 321; a chamfer 322;

a bottle body 3002;

a transition plate 3003; a transition port 3004; the rotary welding fixture fixing boss 3005;

a mating flange 3006; an engaging step surface 30061;

spin-welded structure 400;

a water stop structure 500;

a water stop recessed table 510; a water stop step surface 511; an interference bump 512; a flash tank 513;

a water stopping core 520; the plugging connection section 522; a guide post segment 523;

a water stop spring 530; and a water-stop sealing ring 540.

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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The structure of a composite filter element assembly 1000 according to an embodiment of the present invention is described below with reference to fig. 1-19.

A composite filter element assembly 1000 according to an embodiment of the present invention, as shown in fig. 1, comprises: housing 300, first filter bank 1001, second filter bank 2001.

As shown in fig. 3 and 4, the housing 300 is divided into a first accommodating chamber 100 and a second accommodating chamber 200 along a length direction, the first accommodating chamber 100 and the second accommodating chamber 200 are separated by a transition plate 3003, and the transition plate 3003 is provided with a transition port 3004. The transition plate 3003 allows the first receiving chamber 100 and the second receiving chamber 200 to form two generally spaced chambers within the housing 300, which are in communication only through the transition port 3004.

As shown in fig. 1, the two filter sets are a first filter set 1001 and a second filter set 2001, respectively, the first filter set 1001 is disposed in the first accommodating chamber 100, and the second filter set 2001 is disposed in the second accommodating chamber 200. By arranging two filter groups in the housing 300, the composite filter element assembly 1000 has more filter functions, the integration level is increased, and the water filtered by the second filter group 2001 does not need to flow to the external pipeline of the first filter group 1001 or the water filtered by the first filter group 1001 does not need to flow to the external pipeline of the second filter group 2001, so that the pipeline arrangement form is simplified.

Compared with the existing filter element assembly in which only one filter group is arranged in each shell and the filter groups are communicated through external pipelines, the external pipelines required by the connection of the filter groups are greatly simplified, so that the composite filter element assembly 1000 of the invention occupies less space, is compact in overall layout and saves the internal volume of a cabinet of a user; meanwhile, the integral aesthetic property is enhanced. All filter groups are arranged in the shell 300, and only one set of positioning and mounting structure is needed when the composite filter element assembly 1000 is integrally mounted, so that the assembly is simple and time-saving.

The water pressure in the second accommodating cavity 200 is greater than the water pressure in the first accommodating cavity 100, that is, relatively speaking, the second accommodating cavity 200 is a high-pressure cavity, and the first accommodating cavity 100 is a low-pressure cavity. The transition plate 3003 is used to divide the interior of the housing 300 into two accommodating chambers with different water pressures, so as to place filter elements with different water pressure requirements in the two accommodating chambers. Therefore, after the water pressure in the low-pressure cavity is reduced, the assembly requirements of parts related to the low-pressure cavity are reduced, so that the structure can be greatly simplified, and the assembly cost can be reduced. After the high-pressure cavity is separated, the degree of pressure damage on the parts inside the low-pressure cavity and the joints of the parts is reduced, and the service life is prolonged. And the related parts of the high-pressure cavity are connected according to the corresponding assembly requirements, so that the range of parts of the high-pressure standard is reduced. The sealing performance and structural reliability of the integral composite filter element assembly 1000 are improved, and the overall assembly cost is reduced.

As shown in fig. 1, a water stop structure 500 is provided at least one of the inlet and outlet of the housing 300. Here, the inlet and outlet refers to a water inlet or outlet communicated with the first filter group 1001, and may also refer to a water inlet or outlet communicated with the second filter group 2001.

Specifically, the water stop structure 500 may be provided at each of the inlet and outlet of the case 300, and although the cost is slightly high, the convenience of the detachment is very high. Of course, if the water stopping structure 500 is disposed on only a part of the inlet/outlet of the housing 300, it can be selected according to the installation position of the housing 300, and preferably, the water stopping structure 300 can be installed on all other inlets/outlets of the housing 300 except the inlet/outlet on the top of the housing 300.

It should be noted that the operation principle of the water stop structure 300 is well known in the art. Specifically, after the water stopping structure 500 is disposed at a certain inlet/outlet, when the inlet/outlet is connected to an external pipeline, the water stopping structure 500 automatically opens the inlet/outlet, and when the inlet/outlet is not connected to the external pipeline, the water stopping structure 500 automatically blocks the inlet/outlet.

Like this stagnant water structure 500 can prevent effectively that inside liquid from importing and exporting to the outside and spilling, waters the dismouting personnel when avoiding dismantling composite filter element subassembly 1000 promptly, conveniently changes the filter group in the composite filter element subassembly 1000 or changes composite filter element subassembly 1000. When needs overhaul, change the outside pipeline, extract the exit in the twinkling of an eye of outside pipeline and just be blocked by stagnant water structure 500 very soon, inside liquid is difficult for spilling, and outside air is difficult for getting into simultaneously, and the bubble that produces in the casing 300 is less, is favorable to keeping the holistic filter action of composite filter element group spare 1000, improves the continuity of filtering process, reduces and consumes when changing partial filter group or maintenance influence normal filtration work.

In some examples, as shown in fig. 1, 2, 3, and 4, the housing 300 includes a bottle body 3002, two caps 3001, and a transition plate 3003, the bottle body 3002 is open at both ends, the transition plate 3003 is disposed in the bottle body 3002, and the two caps 3001 are respectively and sealingly connected to both ends of the housing 300. The cap 3001 seals the housing 300 to protect the internal filter stack structures from the external environment.

For convenience of description, one of the caps 3001 will be referred to as a first cap 310, and the other cap 3001 will be referred to as a second cap 320. When the bottle body 3002 defines the first receiving chamber 100 with the transition plate 3003 and the first cap 310, the bottle body 3002 defines the second receiving chamber 200 with the transition plate 3003 and the second cap 320. When the bottle body 3002 defines the first receiving chamber 100 with the transition plate 3003 and the second cap 320, the bottle body 3002 defines the second receiving chamber 200 with the transition plate 3003 and the first cap 310.

The first cap 310 and the bottle body 3002 can be fixedly and hermetically connected by a spin welding structure 400, or can be connected by a screw thread and a sealing ring which are matched and can be opened and closed. Similarly, the second bottle cap 320 and the bottle body 3002 can be fixedly and hermetically connected by the spin welding structure 400, and can also be formed into a connection that can be opened and closed by matching threads with the sealing ring.

In some embodiments of the present invention, as shown in fig. 1, 3, 5, 6, 7, and 8, the water stopping structure 500 includes: water stop concave station 510, water stop core 520, water stop spring 530.

As shown in fig. 4 and 5, the water stop recessed table 510 is connected to the housing 300. The water stopping concave table 510 provides a stress point for the water stopping spring 530, and can also provide limiting and guiding effects for the water stopping core 520 and the water stopping spring 530, so that the water stopping core 520 and the water stopping spring 530 are not easy to skew and block in the process of telescopic movement.

As shown in fig. 5, the water stopping core 520 is movable between a blocking position, in which the water stopping structure 500 blocks the inlet and outlet, and a conducting position, in which the inlet and outlet are communicated with the inside of the housing 300. The waterproof core 520 corresponds to a plug for controlling whether the inlet and outlet are opened or blocked.

The water stopping spring 530 is connected between the water stopping concave table 510 and the water stopping core 520, and the water stopping spring 530 drives the water stopping core 520 to move towards the cut-off position.

The usage of the water stopping structure 500 is that when the inlet and outlet provided with the water stopping structure 500 is connected with an external pipeline, a pin is inserted into the inlet and outlet, and the pin pushes the water stopping core 520, so that the external pipeline is communicated with the inside of the shell 300, that is, the inlet and outlet is in a conduction state. When the external pipeline is detached from the composite filter element assembly 1000, the pins exit the inlet and outlet, the water-stop core 520 is blocked at the inlet and outlet by the water-stop spring 530, and the housing 300 cannot be communicated with the outside through the inlet and outlet. The water stop spring 530 is provided so that the above operations are automatically performed in association with the connection and disconnection of the external pipe.

Alternatively, as shown in fig. 4, the water stopping concave stage 510 is formed in a cylindrical shape with one end opened toward the inlet/outlet, the opened end of the water stopping concave stage 510 covers the inlet/outlet, and a circulation hole is provided in a peripheral wall of the water stopping concave stage 510. The water stopping core 520 and the water stopping spring 530 are positioned in the water stopping concave platform 510, and the water stopping spring 530 is stopped against between the closed end of the water stopping concave platform 510 and the water stopping core 520 so as to prop the water stopping core 520 on the end surface of the inlet and outlet or the inner peripheral wall of the inlet and outlet.

Optionally, as shown in fig. 5, the water stopping core 520 includes a blocking connection section 522 and a guide pillar section 523. The guide post section 523 is arranged along the axial direction of the inlet and outlet, the radial dimension of the guide post section 523 is smaller than that of the inlet and outlet, and at least part of the guide post section 523 extends into the inlet and outlet, i.e. one section of the guide post section 523 is always inserted into the inlet and outlet. The cross section shape and the inlet/outlet shape of the guide pillar segment 523 may be circular or non-circular, but not limited thereto.

The plugging connecting section 522 extends from the outer periphery of the guide pillar section 523 toward the closed end of the water stopping recessed table 510, the plugging connecting section 522 may be cylindrical, and the plugging connecting section 522 may also be composed of a plurality of extending strips as shown in fig. 5. The radial dimension of the plugging connecting section 522 (or the radial dimension of a cylinder shape formed by surrounding a plurality of extending strips) is larger than the radial dimension of the inlet and outlet, so that the water stop core 520 is prevented from running out of the inlet and outlet. The plugging connecting section 522 surrounds the outer side of the water stopping spring 530 to limit.

In some embodiments of the present invention, as shown in fig. 5, 7, and 8, the water stopping structure 500 includes: the water-stopping sealing ring 540 is sleeved on the water-stopping core 520, and the water-stopping sealing ring 540 is contacted with the shell 300 when the water-stopping core 520 is at the cut-off position. The water-stop sealing ring 540 enhances the plugging of the water-stop core 520 to the inlet and the outlet when the water-stop core is at the cut-off position, and effectively ensures the sealing performance of the composite filter element assembly 1000 at the inlet and the outlet when the composite filter element assembly is not connected with an external pipeline.

Alternatively, as shown in fig. 5, a groove is formed on the outer circumference of the guide post segment 523, and the water stop sealing ring 540 is caught in the groove. Therefore, the water-stopping sealing ring 540 can be prevented from falling off in the moving process of the water-stopping core 520, and the water-stopping effect at the inlet and the outlet is increased.

Alternatively, as shown in fig. 7, the water-stop sealing ring 540 is an O-ring, and the O-ring is end-surface fitted to the end surface of the inlet/outlet. The area of the end face of the O-shaped sealing ring is larger, and the sealing of the inlet and the outlet is effectively increased. The cross-sectional shape of the O-ring may be various, for example, the cross-section of the O-ring is circular in fig. 5, and the cross-section of the O-ring is rectangular in fig. 7. Of course, the cross section of the O-ring may be other shapes, such as the O-ring in fig. 8 having a chamfer at the outer edge of the end far from the water stop spring 530. Therefore, the sealing ring is easy to be plugged into the inlet and the outlet, and has a good sealing effect. Advantageously, the chamfer angle of the O-ring is in the range of 30 to 60 degrees. Within the range of the taper, the water stopping effect is optimal.

Further alternatively, as shown in fig. 9 and 10, a chamfer 322 is provided at one end of the inlet/outlet facing the water stopping recessed table 510, and when the water stopping core 520 is at the cut-off position, the water stopping sealing ring 540 contacts with the chamfer 322. The chamfer 322 increases the matching area of the water stop sealing ring 540 and the inlet and outlet end faces, has a guiding function, and is beneficial to improving the overall sealing effect.

Advantageously, the angle range of the chamfer 322 is 30-60 degrees, and the water stopping effect is optimal.

In the example of fig. 8, when the water-stop sealing ring 540 blocks the inlet and outlet, the chamfer of the water-stop sealing ring 540 forms a conical surface contact fit with the chamfer of the end surface of the inlet and outlet, so that the pressing force of the water-stop spring 530 on the conical surface of the water-stop sealing ring 540 not only generates an axial pressing component force, but also generates a radial pressing component force, thereby improving the sealing effect.

In some embodiments of the present invention, as shown in fig. 7, 8, and 9, a fitting flange 3006 is provided around the inlet and outlet in the housing 300, at least a portion of the water stopping recessed table 510 is located inside the fitting flange 3006, and the water stopping recessed table 510 is welded to the fitting flange 3006. The water stop concave table 510 is connected with the matching flange 3006 in a welding mode, so that the connection stability of the water stop concave table 510 in the shell 300 can be enhanced, and the water stop convex table 510 can better limit and support the water stop core 520.

Alternatively, as shown in fig. 6, 9, and 10, the inner peripheral surface of the fitting flange 3006 is formed as a multistage fitting stepped surface 30061, the outer peripheral surface of the water stopping recessed table 510 is provided with a water stopping stepped surface 511 fitted to the fitting stepped surface 30061, the convex angle of the fitting stepped surface 30061 faces the concave angle of the water stopping stepped surface 511, and the concave angle of the fitting stepped surface 30061 faces the convex angle of the water stopping stepped surface 511. For ease of understanding, the convex corner of mating step surface 30061 is shown as i1 and the concave corner of mating step surface 30061 is shown as i2 in fig. 10; the convex angle of the water stop step surface 511 is denoted by j1, and the concave angle of the water stop step surface 511 is denoted by j 2. The multistage matched step surfaces are convenient to assemble and position on one hand, and are beneficial to contact connection of the matched step surfaces 30061 and the water stop step surfaces 511 on the other hand, so that the two step surfaces are more firm after being connected.

As shown in fig. 6, an interference bump 512 is disposed between at least one opposite reentrant corner and convex corner, and the interference bump 512 is a concentrated welding region. When the interference bump 512 is preset at the concave angle, the corresponding convex angle is inserted into the concave angle, and the interference bump 512 after hot melting is extruded, so that the solder melted by the interference bump 512 is extruded to the adjacent surface, thereby enlarging the finally formed welding connection area. Similarly, when the interference bump 512 is pre-positioned at a convex corner, the convex corner is inserted into a corresponding concave corner, and the interference bump 512 after heat melting is also pressed, so as to enlarge the finally formed welding connection area. The interference bump 512 increases the material thickness of the welding area, and the finally formed welding surface is not on the same plane by combining the matching of the concave angle and the convex angle at the interference bump 512, so that the welding connection strength is very high.

Alternatively, as shown in fig. 10, the interference bump 512 is disposed at a concave corner, and the outer surface of the interference bump 512 is formed with a certain inclination such that the interference bump 512 flows along its inclination to other locations when melted.

Further alternatively, as shown in fig. 6, a flash 513 is provided on the water stopping step surface 511 adjacent to the concentrated welding region. The flash tank 513 can collect welding slag in the welding process, and the welding slag collected in the flash tank 513 can increase local strength after solidification; the flash 513 also prevents welding slag from overflowing to the water inlet to prevent flash formation.

In some embodiments of the present invention, the second accommodating chamber 200 is located below the first accommodating chamber 100, the water pressure in the second accommodating chamber 200 is greater than the water pressure in the first accommodating chamber 100, and water stopping structures 500 are disposed at the inlet and outlet at the bottom of the second accommodating chamber 200. The water stopping structures 500 are arranged at the inlet and the outlet of the second accommodating cavity 200 with larger water pressure, so that the water leakage at the inlet and the outlet due to the overlarge internal pressure of the second accommodating cavity 200 can be prevented, and the reliability of the system is improved.

In some embodiments of the present invention, as shown in fig. 4 and 11, when one bottle cap 3001 is connected to the bottle body 3002 by the spin-welding structure 400, a non-circular spin-welding fixture fixing boss 3005 is provided on a surface of the transition plate 3003 on a side opposite to the other bottle cap 3001. For example, the non-circular shape may be a polygonal structure such as a hexagon, a pentagon, or a quadrangle. When bottle lid 3001 is needed to weld the connection on bottle 3002 soon, this weld fixed boss 3005 of frock soon and fixed frock of outside can be fixed a position and be connected, make bottle 3002 not rotate for fixed frock, make and weld the in-process bottle 3002 soon and fix the frock between not taking place to rotate, it is comparatively stable to weld the in-process soon.

As shown in fig. 1, 3, 4, 11, and 12, when two bottle caps 3001 are connected to the bottle body 3002 by spin welding structures 400, a non-circular spin welding fixture fixing boss 3005 is provided on at least one side surface of the transition plate 3003. The bottle body 3002 is conveniently held in a fixed position while the end cap 3001 at one end is welded to the bottle body 3002, preventing rotation of the bottle body 3002.

In some embodiments, as shown in fig. 1, 3, and 4, two caps 3001 are spin welded to the bottle body 3002 to form the integral disposable composite filter assembly 1000. Of course, the bottle cap 3001 and the bottle body 3002 may be connected by a screw thread and a sealing ring to form an openable and closable sealing connection, which is not limited herein.

As shown in fig. 1, a first end structure 401 and a second end structure 402 are respectively disposed at two ends of a first filter group 1001, the first filter group 1001 is respectively connected to a transition plate 3003 and a bottle cap 3001 through the first end structure 401 and the second end structure 402, the first end structure 401 is rotatable relative to the transition plate 3003, and the second end structure 402 is rotatable relative to the bottle cap 3001.

The two ends of the first filtering group 1001 are respectively limited between the bottle cap 3001 and the transition plate 3003, so that the first filtering group 1001 is convenient to install, has certain adjustability during installation, and cannot be inclined integrally after installation. When the first filter group 1001 is impacted by water flow, the first filter group 1001 which can rotate relative to the bottle cap 3001 and the transition plate 3003 has a certain buffer moving space, and is not easy to be inclined due to too large water pressure. A more uniform distribution of the water flow can be achieved more quickly.

The two ends of the second filtering set 2001 are respectively provided with a third end structure 47 and a fourth end structure 48, the second filtering set 2001 is respectively connected with a transition plate 3003 and a bottle cap 3001 through the third end structure 47 and the fourth end structure 48, the third end structure 47 can rotate relative to the transition plate 3003, and the fourth end structure 48 can rotate relative to the bottle cap 3001.

Two ends of the second filtering group 2001 are respectively limited between the bottle cap 3001 and the transition plate 3003, so that the second filtering group 2001 has certain adjustability during installation, and the whole body cannot be skewed after installation.

By the arrangement, the filtering group is connected with the transition port 3004 on the transition plate 3003 and the inlet and the outlet on the bottle cap 3001 through the end structure, so that the connection is very convenient, and unnecessary pipelines are reduced. Moreover, during the assembly of the bottle cap 3001, it is inevitable that the bottle cap 3001 needs to be tightly closed or loosened by rotation, and particularly, when the bottle cap 3001 is spin-welded to the bottle body 3002, the end structure can be rotatably connected without damaging the filter unit. In addition, the cap 3001 can be more tightly connected to the transition plate 3003 and the cap 3001 during the tightening process.

In some embodiments of the present invention, as shown in fig. 1, 2, 3, and 4, the housing 300 is provided with a first inlet/outlet 101, a second inlet/outlet 102, and a third inlet/outlet 201, and the first filter set 1001 includes a first filter element 10, a second filter element 20, and a water path partition plate 46. The waterway divider 46 is connected to the first end structure 401 and the second end structure 402, respectively, to divide the first housing chamber 100 into a first depression 1002 and a second depression 1003 (shown in fig. 3).

The first filter element 10 is disposed in the first low pressure region 1002, the water flowing in from the first inlet/outlet 101 flows out from the second inlet/outlet 102 after passing through the first filter element 10, the second filter element 20 is disposed in the second low pressure region 1003, and the water flowing in from the transition port 3004 flows out from the third inlet/outlet 201 after passing through the second filter element 20. The water path partition plate 46 separates the first filter member 10 and the second filter member 20 in the first receiving chamber 100 to form two independent purification water paths. Other filter elements can be connected between the two groups of filter elements; it is also possible to directly connect the water inlet of the first filter element 10 with the water outlet of the second filter element 20, or directly connect the water outlet of the first filter element 10 with the water inlet of the second filter element 20, so that the purification water path between the first filter element 10 and the second filter element 20 is in a front-rear series relationship.

The low pressure region here indicates that the first and

second filter members

10 and 20 can be normally operated without applying an additional external pressure during the filtration.

Optionally, the first low pressure zone 1002 and the second low pressure zone 1003 have a water pressure less than or equal to the municipal water supply water pressure. The tap water can enter the inlet of the low-pressure area conveniently.

Optionally, the water pressure in the first low-pressure area 1002 is 0.1-0.4 MPa. The tap water is easily introduced from the external pipe network into the first low-pressure region 1002 and filtered by the first filter element 10.

In some embodiments of the present invention, as shown in fig. 1 and 3, the water path partition plate 46 is cylindrical, the second filter element 20 is located inside the water path partition plate 46, the first filter element 10 is sleeved outside the water path partition plate 46, and both ends of the first filter element 10 and both ends of the second filter element 20 are sealed by the first end structure 401 and the second end structure 402.

Optionally, a first uniform flow channel 11 is defined between the first filtering member 10 and the inner wall of the first accommodating cavity 100, and a second uniform flow channel 12 is defined between the water channel partition plate 46 and the first filtering member 10. Here, when the liquid to be purified of the first filtering element 10 is uniformly distributed in the first uniform distribution flow passage 11, the liquid purified by the first filtering element 10 is uniformly distributed in the second uniform distribution flow passage 12; conversely, the same may be true.

A third uniform flow channel 21 is defined between the water path spacing plate 46 and the second filtering piece 20, the first filtering piece 10, the water path spacing plate 46 and the second filtering piece 20 are cylindrical and are sequentially sleeved, and the central cavity of the second filtering piece 20 is a fourth uniform flow channel 22. Here, the fourth equispaced flow passages 22 are in the center of the first receiving cavity 100, and are cylindrical.

The outer side of the fourth uniform flow channel 22 is respectively compactly provided with a layer of second filtering piece 20, a layer of third uniform flow channel 21, a layer of water channel partition plate 46, a layer of second uniform flow channel 12, a layer of first filtering piece 10 and a layer of first uniform flow channel 11 in the radial direction, and the third uniform flow channel 21 and the second uniform flow channel 12 are isolated from each other through the water channel partition plate 46 and do not circulate. The first accommodating chamber 100 is compact in overall arrangement, occupies a small installation space, and has high integration level. The first filter member 10 and the second filter member 20 are conveniently installed.

In some embodiments of the present invention, as shown in fig. 1 and 3, the first end structure 401 includes: and the first outer end cover 42 is connected with one end periphery of the water path partition plate 46 in a sealing mode, and the first outer end cover 42 is connected with one end periphery of the water path partition plate 46 in a sealing mode. As shown in fig. 1, the first outer end cap 42 closes the bottoms of the first filter element 10 and the second uniform flow passage 12, and provides a support for the first filter element 10, so that the liquid to be purified and the liquid after purification on the two sides of the first filter element 10 are effectively prevented from being mixed at the bottom, and the filtering effect of the first filter element 10 is ensured. The water path partition plate 46 is connected to the first outer end cover 42, which is beneficial for the first outer end cover 42 to be firmly arranged at a specific position, so that the second uniform distribution flow channel 12 and the third uniform distribution flow channel 21 are reliably separated, the series flow of the liquid in the first filter element 10 and the second filter element 20 is avoided, and the water quality reduction in each uniform distribution flow channel is avoided.

Optionally, the waterway isolation plate 46 is integrally formed with the first outer end cap 42. The integrated forming is convenient for processing and manufacturing. After the integral forming, a gap is not easy to appear between the waterway partition plate 46 and the first outer end cover 42, and the position is relatively stable.

The first outer end cover 42 is provided with a first insertion pipe 421 communicated with the second low-pressure region 1003, and the first insertion pipe 421 is inserted on the transition plate 3003. The first cannula 421 is inserted into the transition plate 3003, on one hand, the transition port 3004 is further closed, and unnecessary cross flow of liquid between the first accommodating cavity 100 and the second accommodating cavity 200 is prevented; on the other hand, the flow path connection between the second filter element 20 and the second filter bank 2001 is made easier.

The end face of the first filter element 10 is glued to the first outer end cap 42. Thus, the assembly is convenient, and the installation of the integrated core is convenient. Optionally, the first filter element 10 is sealingly attached to the first outer end cap 42 by a ring of hot melt adhesive.

In some embodiments of the present invention, as shown in fig. 1 and 3, the second end structure 402 comprises: a second outer end cap 44, a second middle end cap 45.

The second outer end cap 44 is inserted into the bottle cap 3001 (the first bottle cap 310 in fig. 1), and the end face of the first filter element 10 is glued to the second outer end cap 44. The second outer end cap 44 seals the tops of the first filter element 10 and the second uniform flow passage 12, and provides a connection for the first filter element 10, so as to separate the first inlet/outlet 101 and the second inlet/outlet 102, thereby effectively preventing the liquid to be purified and the purified liquid on the two sides of the first filter element 10 from being mixed at the top, and further ensuring the filtering effect of the first filter element 10.

Specifically, the second outer end cap 44 is fitted on an axial end face of the first filter element 10 away from the transition port 3004 to block the first filter element 10, and the second outer end cap 44 is provided with an outer port 441 inserted into the bottle cap 3001.

Alternatively, the periphery of the second outer end cap 44 is provided with a downward flange, and the inner side face of the flange is in contact with the outer peripheral face of the first filter member 10. The arrangement of the flanging makes the connection between the second outer end cover 44 and the first filter element 10 tighter, and increases the reliability of the connection. And the liquid blocking effect of the second outer end cover 44 on the end face of the first filter piece 10 can be enhanced, and the fool-proof fit of the first filter piece 10 can be formed, so that the assembly is easy.

The axial end face of the first filter element 10 is glued to the second outer end cap 44, which facilitates not only assembly but also installation of the integrated core. Optionally, the first filter element 10 is sealingly attached to the second outer end cap 44 by a ring of hot melt adhesive.

In the example of fig. 3, a sixth cannula 442 is formed on the second outer end cap 44, the orifice of the sixth cannula 442 forming the outer port 441. The sixth cannula 442 may be inserted within the second adapter 312 and the sixth cannula 442 may also be inserted outside the second adapter 312. In order to improve the sealing effect, a sealing ring is disposed between the sixth insertion tube 442 and the second connection tube 312.

As can be seen, one end of the first filter member 10 is inserted into the transition opening 3004 through the first outer end cap 42, and the other end of the first filter member 10 is inserted into the second connection pipe 312 through the second outer end cap 44, so that the position of the first filter member 10 is substantially fixed, and the assembly process is a two-end insertion process, thereby making the assembly very simple and time-saving. And both ends of the first filter member 10 are not removed as long as the housing 300 is not deformed, whereby it can be seen that the first filter member 10 is assembled with high reliability.

The second intermediate cap 45 is sealingly connected to the circumferential wall of the water passage partition plate 46, and the second intermediate cap 45 is inserted into the cap 3001 (the first cap 310 in fig. 1).

Optionally, as shown in fig. 3, a third connection tube 313 is disposed on the inner peripheral wall of the first bottle cap 310 facing the bottle body 3002, and a middle port 451 is disposed on the second middle end cap 45 and connected to the third connection tube 313 in an inserting manner.

In the embodiment of the present invention, the second middle cap 45 may not be provided, so that the waterway isolation plate 46 may be directly connected to the third connection pipe 313, thereby saving the number of parts. However, since the second filter element 20 is assembled to the inner side of the waterway partition plate 46, the waterway partition plate 46 cannot be installed if the opening is small, and the assembly of the second outer end cap 44 and the first filter element 10 is affected if the opening of the waterway partition plate 46 is large, which increases the difficulty of the whole assembly.

Therefore, the second middle end cover 45 is provided, parts such as the second filter piece 20 and the like are firstly installed in the water channel partition plate 46 during assembly, and then the second middle end cover 45 is connected to the water channel partition plate 46, so that the assembly requirement is met, and the reliability of the overall assembly is improved. On the other hand, when the water path partition plate 46 is integrally formed with the first outer end cap 42, the water path partition plate can be manufactured by an integral injection molding method, and at this time, the second middle end cap 45 should not be integrally injection molded for convenience of mold opening.

The third connecting pipe 313 is arranged on the first bottle cap 310, the third connecting pipe 313 is connected with the middle port 451 in an inserted mode, the step of fixing the end portion of the water path partition plate 46 only comprises the inserting process, and the first bottle cap is very simple to assemble, saves time and is high in reliability. In the example of fig. 3, a seventh cannula 452 is formed on the second middle end cap 45, and a nozzle of the seventh cannula 452 forms the middle port 451. The seventh cannula 452 may be inserted inside the third adapter 313 and the seventh cannula 452 may also be inserted outside the third adapter 313. In order to improve the sealing effect, a sealing ring is arranged between the seventh insertion tube 452 and the third connection tube 313, and a sealing ring is also arranged between the second middle end cover 45 and the waterway partition plate 46.

In the example of fig. 1, the small distance between the second center end cap 45 and the second outer end cap 44 allows for a delicate balancing of the water pressure as it passes through the first filter element 10. That is, when the water pressure inside the waterway partition 46 is higher than the water pressure outside, the second middle cap 45 may be pressed against the second outer cap 44, and the filtering speed of the first filter member 10 is slowed down. During normal operation, the water pushes the second middle end cover 45 open and flows normally toward the second inlet/outlet 102.

In some embodiments of the invention, the second filter element 20 is cylindrical and is spaced apart from the waterway spacer 46. The third uniform flow channel 21 is formed between the cylindrical second filter element 20 and the water passage partition plate 46.

In some embodiments of the present invention, as shown in fig. 1 and 3, the second end structure 402 further comprises: a second inner end cap 43, and the second inner end cap 43 is inserted into the bottle cap 3001 (the first bottle cap 310 in fig. 1). The form of the insertion fit is convenient for assembly.

Optionally, a second inner end cap 43 is fitted on the axial end face of the second filter member 20 far from the transition port 3004 to block the second filter member 20, and an inner end port 431 communicating with the third inlet and outlet port 201 is provided on the second inner end cap 43. Here, the second inner end cap 43 closes the top of the second filter element 20 and provides a top connection for the second filter element 20 and a direction for the third inlet/outlet 201, which effectively prevents the liquid to be purified on both sides of the second filter element 20 and the purified liquid from crossing at the top, further ensuring the filtering effect of the second filter element 20. The fluid filtered by the second filter assembly 20 is collected in the fourth uniform flow channel 22 and discharged to the outside through the inner port 431.

Alternatively, the periphery of the second inner end cap 43 is provided with a downward flange whose inner side surface is in contact with the outer peripheral surface of the second filter member 20. The second inner end cap 43 is provided with an inner flange extending into the fourth equispaced flow channels 22, and the outer peripheral surface of the inner flange contacts the inner peripheral surface of the second filter member 20. The inner flange and the outer flange are each arranged the same, so that the connection between the second inner end cap 43 and the second filter element 20 is tighter, and the reliability of the connection is increased. And the liquid blocking effect of the second inner end cap 43 on the end face of the second filter member 20 can be enhanced, and the fool-proof fit of the second inner end cap 43 can be formed, so that the assembly is easy.

Specifically, one end face of the second filter member 20 is glued to the second inner end cap 43, which not only facilitates assembly, but also facilitates installation of the integrated core. Optionally, the second filter pack 20 is sealingly attached to the second inner end cap 43 by a bead of hot melt adhesive.

Specifically, the first end structure 401 further includes: the first inner end cap 41, and the other end face of the second filter member 20 is glued to the first inner end cap 41.

One end of the second filter member 20 is inserted into the first connection pipe 311 through the second inner end cap 43, the other end of the second filter member 20 is sealed by the first inner end cap 41, and the interval between the first inner end cap 41 and the first outer end cap 42 is very small, which is equivalent to that the other end of the second filter member 20 is supported by the first outer end cap 42. In this way, the position of the second filter element 20 is also substantially fixed and the assembly step is carried out with only one end plugged, which makes it possible to assemble it very simply and in a time-saving manner. And both ends of the second filter member 20 are not removed as long as the housing 300 is not deformed, whereby it is seen that the assembling reliability of the second filter member 20 is high.

In some examples, as shown in fig. 3, the inner peripheral wall of the first bottle cap 310 of the housing 300 is provided with a first connection tube 311 and a second connection tube 312, the inner port 431 of the second inner end cap 43 is connected with the first connection tube 311 in a plugging manner, and the outer port 441 of the second outer end cap 44 is connected with the second connection tube 312 in a plugging manner. This manner of assembling the plug connection makes it very easy to fix the first filter cartridge 10 and the second filter cartridge 20 in the housing 300.

In the example of fig. 3, a fifth cannula 432 is formed on the second inner end cap 43, and a nozzle of the fifth cannula 432 forms the above-described inner port 431. The fifth cannula 432 may be inserted inside the first adapter 311, and the fifth cannula 432 may also be inserted outside the first adapter 311. In order to improve the sealing effect, a sealing ring is disposed between the fifth insertion tube 432 and the first connection tube 311.

In some embodiments, all of the components of the first receiving cavity 100 are pre-assembled into a single piece, that is, the first filter element 10, the second filter element 20, the first inner end cap 41, the first outer end cap 42, the second inner end cap 43, the second outer end cap 44, and the second middle end cap 45 are pre-connected into a front-rear integrated filter cartridge. Even the sealing rings at the first adapter 311, the second adapter 312, and the third adapter 313 may be pre-assembled to the fifth cannula 432, the sixth cannula 442, and the seventh cannula 452.

Such a front-rear integrated filter element can be directly inserted between the transition plate 3003 and the first bottle cap 310 during assembly, and the assembly process of the whole machine is greatly simplified. And if first bottle lid 310 is the removable connection on bottle 3002, that user's back of using, also can change by oneself the leading-back integration filter core (the filter core subassembly in the low-pressure zone), the operating procedure when user oneself changes is also very easy moreover, has improved user's the experience of trading the core, has reduced the cost of trading the core.

Alternatively, as shown in fig. 3, the second middle end cap 45, the second inner end cap 43, and the second outer end cap 44 are flush at the top. The capping of the top of the first receiving chamber 100 by the first cap 310 is facilitated.

In some embodiments of the invention, as shown in fig. 1 and 3, the third filter element 30 is disposed in the second receiving chamber 200 as part of the second filter bank 2001, i.e., the third filter element 30 is located in the high pressure zone 2002. Here, the third filter element 30 can further increase the overall filtering function of the composite filter element assembly 1000, and improve the quality of the discharged water.

Alternatively, the pressure of the water in the high pressure zone 2002 (shown in FIGS. 3 and 4) may be 0.7-0.85 MPa. The higher water pressure facilitates the filtration of the third filter element 30, increases the speed of the water flow through the membrane, and provides more possibilities for the material selection of the third filter element 10, enhancing the filtration capacity of the third filter element 30.

In some embodiments of the present invention, as shown in fig. 1, the housing 300 is provided with a fourth port 302 and a fifth port 301. When the fourth inlet/outlet 302 is the water inlet of the third filter 30, the fifth inlet/outlet 301 is the water outlet of the third filter 30; conversely, when the fourth inlet/outlet 302 is the water outlet of the third filter 30, the fifth inlet/outlet 301 is the water inlet of the third filter 30.

Alternatively, the third filter member 30 is formed in a cylindrical shape, a fifth uniform flow passage 31 is defined between the third filter member 30 and the inner wall of the second accommodating chamber 200, the fourth inlet/outlet 302 communicates with the fifth uniform flow passage 31, and the center of the third filter member 30 is disposed opposite to the transition port 3004. Different uniformly distributed flow passages are respectively formed on the inner side and the outer side of the cylindrical third filtering element 30, one is the fluid to be purified of the third filtering element 30, the other is the fluid purified by the third filtering element 30, and a flow cavity in the middle of the third filtering element 30 is communicated with the transition port 3004.

From the layout of the third filter element 30 and the fifth uniform flow channel 31, when the water flow passes through the third filter element 30, most of the water flow passes through the third filter element 30 along the radial direction, the passing path is short, and the flow volume is large. And the impurities on the surface of the filter piece are washed when the water flows through the filter piece in the radial direction, and the water flows through the filter piece after the impurities are more easily washed away. Most of water flow of the filtering piece flows along the axial direction basically when water enters the filtering piece, so that the uniform distribution of the water flow is facilitated, and the impurities washed away are brought to one end of the axial direction, so that the impurities are prevented from being blocked on the surface of the filtering piece.

In some examples of the present invention, as shown in fig. 1 and 3, the composite filter element assembly 1000 further includes a central tube 33, the central tube 33 is disposed in the center of the third filter element 30, the wall of the central tube 33 is provided with filtered water inlet holes, and pure water filtered by the third filter element 30 can be disposed in the central tube 33.

As shown in fig. 1, 2 and 3, the housing 300 is provided with a fifth inlet/outlet 301, a waste water header 34 is provided in the center of the third filter element 30, the waste water header 34 is connected to the fifth inlet/outlet 301, and the waste water header 34 can discharge waste liquid with high ion concentration.

In the embodiment of the present invention, as shown in fig. 1, the water stop structure 500 is disposed in both the fifth inlet/outlet 301 and the fourth inlet/outlet 302. Here, the second filter set 2001 may have more filter material selectivity, i.e. a filter material with high pressure resistance may be selected to enhance the filtering capability of the second filter set 2001, and still have good sealing and water-stopping properties.

The features of the invention defined as "first", "second", "third", "fourth" and "fifth" may explicitly or implicitly include one or more of the features for distinguishing between the described features, whether sequential or not.

In some embodiments, as shown in fig. 1, second filter bank 2001 includes: a reverse osmosis membrane element, the reverse osmosis membrane element comprising: the reverse osmosis membrane filter comprises a central tube group and a plurality of reverse osmosis membrane bags 32, wherein the central tube group comprises a central tube 33 and a plurality of waste water collecting tubes 34 which are arranged at intervals, the waste water collecting tubes 34 are arranged around the central tube 33, filter water inlet holes are formed in the tube wall of the central tube 33, and waste water inlet holes are formed in the tube wall of the waste water collecting tubes 34.

The reverse osmosis membrane element described below is explained in the configuration of a spiral wound reverse osmosis membrane element.

As shown in fig. 17-19, the reverse osmosis membrane bag 32 includes spirally wound sets of filtration membranes. The ro bags 32 have a first portion located inside the center tube group and a second portion located outside the center tube group, each waste header 34 and the center tube 33 being separated by the first portion of at least one ro bag 32, the second portions of the plurality of ro bags 32 forming a multi-layered membrane module around the periphery of the center tube group. The multi-layered membrane module is a cylinder in which a plurality of reverse osmosis membrane bags 32 are wound, and the cylinder constitutes the third filter 30.

Wherein, the water entering the second containing chamber 200 from the fourth inlet/outlet 302 is filtered by the reverse osmosis membrane bag 32 and flows to the filtered water inlet hole, the waste water header 34 is connected with the fifth inlet/outlet 301, and the central tube 33 is connected with the transition port 3004.

The water flowing from the fourth inlet/outlet 302 to the fifth uniform flow channel 31 flows through the reverse osmosis membrane bag 32 in the radial direction and flows towards the central tube group, water molecules continuously permeate into the reverse osmosis membrane bag 32 in the flowing process, and the purified water permeating into the reverse osmosis membrane bag 32 partially continues to flow towards the central tube 33 in the radial direction and partially flows towards the central tube 33 in the spiral direction under the influence of the extending direction of the membrane. Eventually purified water enters the center tube 33 from the filtered water inlet and then flows toward the transition port 3004. The water that does not permeate into the reverse osmosis membrane bag 32 is collected at the waste water collecting pipe 34, the remaining waste water flows to the waste water collecting hole on the pipe wall of the waste water collecting pipe 34, and the waste water collecting pipe 34 is connected with the fifth inlet and outlet 301, and the waste water is discharged from the fifth inlet and outlet 301.

The reverse osmosis membrane element adopts a side flow water-saving film, and the surface flow rate of the membrane is improved by side inflow, so that the higher pure water recovery rate is ensured, and the longer service life of the reverse osmosis membrane bag 32 is prolonged.

Alternatively, the third filter element 30 may be an ultrafiltration membrane module, and in particular, an ultrafiltration membrane cartridge that is commercially available may be used. The principles and techniques of ultrafiltration and reverse osmosis are well known to those skilled in the art and will not be described in detail herein. In addition, when the third filter member 30 is the above filter member, the liquid is pressurized in advance and then pumped into the fourth inlet/outlet 302.

In some embodiments of the present invention, at least one circle of the fixed shaft protrusions are disposed on the outer circumference of each of the first filter group 1001 and the second filter group 2001, and the fixed shaft protrusions of each circle respectively stop against the inner wall of the housing 300. Therein, the fixed-axis bumps of the first filter stack 1001 are not shown. The centering projections of the second filter group 2001 are respectively provided on the third end structure 47 and the fourth end structure 48, and for convenience of description, the centering projections on the third end structure 47 will be described as first centering projections 474, and the centering projections on the fourth end structure 48 will be described as second centering projections 484.

The arrangement of the dead axle projection enables the bottle cap 3001 to rotate relative to the bottle body 3002, the dead axle projection has the function of aligning the filter group, and the coaxiality of the filter group and the bottle body 3002 is guaranteed.

In some embodiments of the invention, the reverse osmosis membrane elements are connected at their axial ends to a third end structure 47 and a fourth end structure 48, respectively. The third end structure 47 and the fourth end structure 48 are respectively inserted on the transition plate 3003 and the bottle cap 3001. The third end structure 47 and the fourth end structure 48 close two ends of the reverse osmosis membrane element, so that water between different flow channels of the reverse osmosis membrane element is not in series flow or interference, and the filtering effect of the reverse osmosis membrane element is ensured. By respectively inserting the transition plate 3003 and the bottle cap 3001 (such as the second bottle cap 320 in fig. 1 and 2), the reverse osmosis membrane element is easy to assemble, has a stable assembly structure, and is prevented from being inclined in a long-term use process.

Specifically, as shown in fig. 1 and 3, the third end structure 47 is fitted on an end surface of the third filter element 30 facing the transition port 3004, a second insertion tube 471 and a third insertion tube 472 which are communicated with each other are provided at both ends of the third end structure 47, the second insertion tube 471 is inserted into the transition port 3004, and the third insertion tube 472 is connected to the central tube 33. Here, the third end structure 47 closes the top of the third filter element 30 and provides a top supporting connection for the third filter element 30, effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from crossing at the top.

Wherein, third end structure 47 is pegged graft in transition port 3004 through second intubate 471, and on the one hand is convenient for seal, prevents that the interior high-pressure water of second holding chamber 200 from not filtering through reverse osmosis membrane bag 32 just flowing to transition port 3004, and on the other hand utilizes the location of transition port 3004, can also reduce the assembly degree of difficulty when improving positioning accuracy.

The third end structure 47 is inserted into the central tube 33 through the third insertion tube 472, so that on one hand, the sealing is realized by the surface contact between the third insertion tube 472 and the tube wall of the central tube 33, on the other hand, the positioning and the installation of the central tube 33 are facilitated, and the central tube 33 is prevented from being inclined and leaking water after long-term use.

In addition, as shown in fig. 14, the third terminal structure 47 is provided with a first positioning protrusion 473, the first positioning protrusion 473 is disposed corresponding to the waste water header 34, one end of the waste water header 34 is inserted into the first positioning protrusion 473, and the first positioning protrusion 473 has a certain fool-proof matching function, so that the third terminal structure 47 and the waste water header 34 can be conveniently positioned and installed, and the waste water header 34 can be prevented from being inclined after long-term use.

Optionally, as shown in fig. 13 and 14, the peripheral wall of the third end structure 47 is provided with a first fixed shaft protrusion 474, the first fixed shaft protrusions 474 are circumferentially spaced apart, and the first fixed shaft protrusions 474 abut against the inner wall of the housing 300, so that the alignment degree of the third filter 30 in the second accommodating cavity 200 is improved, and the third filter 30 is prevented from being skewed as a whole and cannot be fitted at the transition opening 3004.

Advantageously, a sealing ring is provided between the second cannula 471 and the transition opening 3004.

In some embodiments of the present invention, as shown in fig. 1, 3, 15 and 16, the fourth end structure 48 of the composite filter element assembly 1000 is fitted to the end surface of the third filter element 30 away from the transition port 3004, and the fourth end structure 48 is provided with a waste discharge port 482 connected to the waste water header 34 and the fifth inlet/outlet port 301, respectively.

In addition, as shown in fig. 16, the middle part of the fourth end structure 48 protrudes and is provided with a second positioning protrusion 483, the second positioning protrusion 483 corresponds to the central tube 33, one end of the central tube 33 is inserted on the second positioning protrusion 483, the second positioning protrusion 483 has a plugging function and also has a certain fool-proof matching function, the fourth end structure 48 and the central tube 33 are conveniently positioned and installed, the central tube 33 is prevented from being inclined in long-term use, the lower part of the central tube 33 can be sealed, and liquid in the central tube 33 is prevented from flowing out.

Optionally, as shown in fig. 15 and 16, the peripheral wall of the fourth end structure 48 is provided with second centering protrusions 484, the second centering protrusions 484 are arranged at intervals along the circumferential direction, and the second centering protrusions 484 abut against the inner wall of the housing 300, so that the centering degree of the third filter 30 in the second accommodating cavity 200 is improved, and the third filter 30 is prevented from being tilted integrally and being unable to be well fitted at the fifth inlet/outlet 301.

In fig. 1, the fourth end structure 48 closes the bottom of the third filter element 30 and the central tube 33, and provides a bottom seal and support for the third filter element 30, effectively preventing the liquid to be purified and the purified liquid on both sides of the third filter element 30 from crossing at the bottom, and ensuring the filtering effect of the third filter element 30. The waste header 34 communicates between the waste 482 and the fifth inlet/outlet 301 to allow the high salinity waste water to flow out of the housing 300 sufficiently quickly.

In some examples of the present invention, as shown in fig. 1, a fourth connection pipe 321 is disposed on an inner circumferential wall of the housing 300, the fourth connection pipe 321 is disposed on the second bottle cap 320 in fig. 5, the fourth connection pipe 321 communicates with the fifth inlet/outlet 301, a fourth insertion tube 481 is disposed on the fourth end structure 48, and the fourth insertion tube 481 is connected to the fourth connection pipe 321 in an inserting manner. The insertion connection of the fourth insertion tube 481 and the fourth connection tube 321 ensures that no series flow occurs between the high-concentration waste liquid and the liquid to be purified. In addition, the fourth terminal structure 48 is secured to the bottom of the housing 300 in a stable manner to prevent the third filter element 30 from changing position during the filtration process.

Optionally, a sealing ring is disposed between the fourth cannula 481 and the fourth adapter 321 to improve the sealing performance.

In some specific examples, all parts in the second receiving chamber 200 are pre-assembled into a single piece, i.e., the central tube 33, the waste water header 34, the reverse osmosis membrane bag 32, the third end structure 47, and the fourth end structure 48 are pre-connected into an integrated reverse osmosis membrane filter element. Even the sealing rings at the transition port 3004 and the fourth adapter 321 may be pre-assembled to the second insertion tube 471 and the fourth insertion tube 481.

Such an integrated reverse osmosis membrane filter element can be directly inserted between the transition plate 3003 and the second bottle cap 320 during assembly, and the assembly process of the whole machine is greatly simplified. And if the second bottle lid 320 can be dismantled and connect on bottle 3002, that user also can change integration reverse osmosis membrane filter core by oneself after using, and the operation step when user oneself changes is also very easy moreover, has improved user's the experience of changing the core, has reduced the cost of changing the core.

In some examples of the present invention, the first filter member 10 is a roll made of a nonwoven fabric, a polypropylene layer, or a 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 first filter member 10 may be formed by rolling only one or two of the filter layers, and is not particularly limited thereto.

In some examples of the invention, the second filter element 20 is a hollow carbon rod. The carbon rod can filter off peculiar smell, organic matters, colloid, iron, residual chlorine and the like in the water body, so that the second filter element 20 controls the water quality condition of the drinking water after water outlet and improves the taste. Of course, the second filter 20 may be formed by combining activated carbon particles, a filter screen and a frame, and is not limited to the arrangement of carbon rods. In addition, the carbon filter medium can be replaced by a KDF55 processing medium (high-purity copper/zinc alloy medium), residual chlorine in water is removed through electrochemical reaction, mineral scaling is reduced, suspended solid matters such as ferrous oxide and the like are reduced, microorganisms are inhibited, and heavy metals are removed.

To better understand the aspects of an embodiment of the present invention, the structure of a composite filter element assembly 1000 in one embodiment of the present invention is described below in conjunction with fig. 1-19.

The following embodiments describe the three-stage filtering function of the composite filter element assembly 1000 by taking purified tap water as an example, and describe a highly integrated design structure of the composite filter element assembly 1000. In addition, the first filter member 10 in the first filter group 1001 is described by taking a roll-type primary filter member formed by rolling a nonwoven fabric, a polypropylene layer, carbon fibers, and a spacer 49 as an example; the third filter element 30 of the second filter bank 2001 is illustrated with a high water saving side-stream reverse osmosis membrane as an intermediate filter. The second filter element 20 of the first filter group 1001 is illustrated as a final stage filter with a cylindrical hollow carbon rod.

As shown in fig. 1, 2, 3, and 4, a composite filter element assembly 1000 is provided in which the entire composite filter element assembly 1000 is normally installed in a vertical position. The bottle cap assembly comprises a housing 300, wherein the housing 300 comprises a bottle body 3002 with two open ends, and a first bottle cap 310 and a second bottle cap 320 which are closed at two ends, and each bottle cap 3001 is hermetically connected with the bottle body 3002 through a spin-welding structure 400.

The first bottle cap 310 is provided with a first inlet and outlet 101 for inlet of tap water, a second inlet and outlet 102 for outlet of pre-positioned water, and a third inlet and outlet 201 for outlet of drinking water. The first bottle cap 310 extends to the side to form a handle 314, the first inlet and outlet 101, the second inlet and outlet 102 and the third inlet and outlet 201 are arranged on one side close to the handle 314, and the second bottle cap 320 is provided with a fourth inlet and outlet 302 for reverse osmosis preposed water inflow and a fifth inlet and outlet 301 for reverse osmosis high salinity wastewater drainage. As shown in fig. 1, in actual installation, the first accommodating chamber 100 is located at a top, and the second accommodating chamber 200 is located at a bottom, so that the water stop structures 500 are disposed at the fourth port 302 and the fifth port 301.

As shown in fig. 5 to 9, the water stopping structure 500 includes a water stopping recessed table 510, a water stopping core 520, a water stopping spring 530, and a water stopping sealing ring 540. The shell 300 is internally provided with a matching flange 3006 around the inlet and outlet, the water stopping concave table 510 is connected to the matching flange 3006 in a welding way, the matching flange 3006 is provided with a multistage matching step surface 30061, and the outer peripheral surface of the water stopping concave table 510 is provided with a water stopping step surface 511 matched with the matching step surface 30061. The water stop step surface 511 is provided with an interference bump 512 and a flash tank 513 which are welded together.

As shown in fig. 1, a transition plate 3003 is integrally formed inside the housing 300 and is perpendicular to the wall of the cylinder, and the transition plate 3003 axially separates the housing 300 to form the first receiving chamber 100 and the second receiving chamber 200. The middle part of the transition plate 3003 is provided with a transition port 3004 along the axial direction. The first receiving chamber 100 and the second receiving chamber 200 communicate with each other through the transition port 3004. As shown in fig. 12 and 13, the transition port 3004 protrudes outward to form a non-circular spin welding fixture fixing boss 3005, and the transition port 3004 is a circular through hole.

As shown in fig. 1, the first filter set 1001 includes a first filter member 10, a second filter member 20, and a water-way partition plate 46, the water-way partition plate 46 is connected to the first end structure 401 and the second end structure 402, respectively, to partition the first receiving chamber 100 into a first low pressure region 1002 and a second low pressure region 1003, the first filter member 10 is disposed in the first low pressure region 1002, water flowing in from the first inlet/outlet 101 flows out from the second inlet/outlet 102 after passing through the first filter member 10, the second filter member 20 is disposed in the second low pressure region 1003, and water flowing in from the transition port 3004 flows out from the third inlet/outlet 201 after passing through the second filter member 20. Furthermore, two sets of filter units are formed in the first receiving chamber 100, namely a first filter element 10 with a cylindrical shape, which is arranged in the center of the first receiving chamber 100, as a primary filter unit, and a second filter element 20, which is arranged outside the first receiving chamber 100, as a final filter unit. The axial length of the first filter member 10 is greater than the axial length of the second filter member 20. The first filter element 10 and the second filter element 20 are separated from each other by a cylindrical water passage partition plate 46. An annular first uniform flow passage 11 is defined between the first filter element 10 and the inner wall of the first accommodating cavity 100, and as shown in fig. 1, the first uniform flow passage 11 is connected to the first inlet/outlet 101. An annular second uniform flow channel 12 is defined between the water path partition plate 46 and the first filtering piece 10, and the second uniform flow channel 12 is connected with the second inlet/outlet 102. An annular third uniform flow channel 21 is defined between the water path partition plate 46 and the second filtering piece 20, and a cylindrical fourth uniform flow channel 22 is arranged on one side of the second filtering piece 20 far away from the third uniform flow channel 21. The third uniform flow channels 21 are connected with the transition ports 3004, and the fourth uniform flow channels 22 are connected with the third inlet and outlet ports 201.

As shown in fig. 1 and 3, the upper end of the second filter member 20 is provided with a second inner end cap 43, the lower end of the second filter member 20 is provided with a first inner end cap 41, and the first inner end cap 41 is fitted on the axial end surface of the second filter member 20 facing the transition port 3004 to block the second filter member 20 and the fourth uniform flow channels 22; the second inner end cap 43 is fitted on the axial end face of the second filter member 20 far from the transition port 3004 to block the second filter member 20, and the second inner end cap 43 is provided with an inner port 431 communicating with the third inlet and outlet port 201. The upper end of the first filter element 10 is provided with a second outer end cover 44, and the second outer end cover 44 is provided with an outer port 441 which is sleeved outside the inner port 431; a first outer end cap 42 is provided on an axial end face of the first filter element 10 facing the transition opening 3004. A water passage partition plate 46 is integrally formed on the first outer end cover 42, and the first outer end cover 42 blocks the lower portions of the first filter member 10 and the third uniform flow passage 21. A second middle end cover 45 is sleeved between the second outer end cover 44 and the second inner end cover 43, the second middle end cover 45 is matched on the peripheral wall of the waterway partition plate 46, and a middle port 451 is formed on the second middle end cover 45. And a sealing element is additionally arranged between the second middle end cover 45 and the third connecting pipe 313, and a sealing element is additionally arranged between the second inner end cover 43 and the first connecting pipe 311.

As shown in fig. 3, a first connection pipe 311 is provided on the inner circumferential wall of the housing 300 toward the second inner end cover 43, a second connection pipe 312 is provided on the inner circumferential wall of the housing 300 toward the second outer end cover 44, a third connection pipe 313 is provided on the inner circumferential wall of the housing 300 toward the second middle end cover 45, and the middle port 451 of the second middle end cover 45 is connected to the third connection pipe 313 in an inserting manner. A passage connecting the second port 102 is formed between the third adapter 313 and the second outer end cap 44.

As shown in fig. 1, 17, 18 and 19, the second filter bank 2001 is disposed in the second receiving chamber 200, the second filter bank 2001 includes a third filter element 30, and the cylindrical third filter element 30 is disposed in the second receiving chamber 200. A fifth uniform flow channel 31 is defined between the third filter element 30 and the inner wall of the second receiving chamber 200, and a central tube 33 at the center of the third filter element 30 is disposed opposite to the transition port 3004. The central tube 33 has a filtered water inlet hole formed in a wall thereof, the third filter member 30 is composed of a plurality of reverse osmosis membrane bags 32, the reverse osmosis membrane bags 32 have a first portion and a second portion, each of the waste water headers 34 and the central tube 33 are separated by the first portion of at least one of the reverse osmosis membrane bags 32, and the second portion of the plurality of reverse osmosis membrane bags 32 is formed to surround a tube group composed of the central tube 33 and the plurality of waste water headers 34 to form a multi-layered spirally wound membrane module.

As shown in fig. 3, 17 and 18, five waste water manifolds 34 are provided around the central pipe 33, and each waste water manifold 34 is connected to the fifth inlet/outlet 301 through the second end cap 320. One reverse osmosis membrane bag 32 for each waste header 34.

As shown in fig. 1, 3 and 13, the third filter member 30 is provided at its two ends with a third end structure 47 and a fourth end structure 48, respectively, the third end structure 47 is sealed at the end of the third filter passage 32 and the waste water flow chamber facing the first accommodating chamber 100, and the fourth end structure 48 is sealed at the end of the third filter passage 32 and the filtered water flow chamber far away from the first accommodating chamber 100. The two ends of the third end structure 47 are provided with a second insertion tube 471 and a third insertion tube 472 which are communicated, the second insertion tube 471 is inserted into the transition port 3004, and the third insertion tube 472 is connected with the central tube 33. The third end structure 47 is provided with a first positioning projection 473 which is in foolproof fit with the waste pipe 34. The peripheral wall of the third terminal structure 47 is provided with a first fixing boss 474 for fitting with the top of the third filter member 30. The fourth end structure 48 is provided with a waste 482 connected to the waste manifold 34. A fourth connection pipe 321 is arranged on the inner peripheral wall of the shell 300 towards the fourth end structure 48, the fourth connection pipe 321 is communicated with the fifth inlet and outlet 301, a fourth insertion pipe 481 is arranged on the fourth end structure 48, and the fourth insertion pipe 481 is connected with the fourth connection pipe 321 in an insertion manner. The fourth end structure 48 is provided with a second positioning protrusion 483 for plugging and matching with the central tube 33. The peripheral wall of the fourth end structure 48 is provided with a second fixed axis projection 484 to fit with the bottom of the third filter member 30. A sealing ring is additionally arranged between the third end structure 47 and the first outer end cover 42. A sealing ring is additionally arranged between the first outer end cover 42 and the transition port 3004.

The whole process of filtering the tap water is that the tap water enters the first uniform flow channel 11 from the first inlet/outlet 101, flows to the radial inner side, flows to the second uniform flow channel 12 after being filtered by the first filter element 10, and flows out as the front water from the second inlet/outlet 102 at the upper part. The effluent pre-water is pressurized and pumped into the fourth inlet/outlet 302, and is uniformly distributed in the fifth uniformly distributed flow channels 31, flows in from the side direction of the side flow reverse osmosis water-saving film and is filtered by the third filtering element 30, the high salinity wastewater is collected by the wastewater header 34 and is discharged from the fifth inlet/outlet 301, and the pure water is collected upwards by the central pipe 33 and passes through the transition port 3004. The pure water enters the third uniform flow passage 21 from the transition port 3004, is filtered by the second filtering piece 20 along the radial direction, enters the fourth uniform flow passage 22, and flows out from the third inlet and outlet 201 for drinking.

In the description of the present invention, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "top", "bottom", "inner", "outer", "axial", "radial", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element 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, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Other configurations of the composite filter element assembly 1000 according to embodiments of the present invention, such as the filtering function of each filter element, the selection of the material of each filter element, and the order of the arrangement of each filter element, 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 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:

the water-stopping device comprises a shell, wherein a first accommodating cavity and a second accommodating cavity are separated from each other in the shell along the length direction, the first accommodating cavity and the second accommodating cavity are separated from each other through a transition plate, a transition port is formed in the transition plate, the water pressure in the second accommodating cavity is greater than the water pressure in the first accommodating cavity, and a water-stopping structure is arranged at least one inlet and outlet on the shell;

the first filtering group is arranged in the first accommodating cavity;

and the second filtering group is arranged in the second accommodating cavity.

2. The composite filter element assembly of claim 1, wherein the water-stopping structure comprises:

the water stopping concave table is connected to the shell;

the water stopping core can move between a cut-off position and a conduction position, the water stopping structure blocks the inlet and the outlet at the cut-off position, and the inlet and the outlet are communicated with the inside of the shell at the conduction position;

the water stopping spring is connected between the water stopping concave platform and the water stopping core, and the water stopping spring normally drives the water stopping core to move towards the cut-off position.

3. The composite filter element assembly of claim 2, wherein the water-stopping structure comprises: the water stopping sealing ring is sleeved on the water stopping core, and the water stopping core is in contact with the shell when in a cut-off position.

4. The composite filter element assembly of claim 3, wherein the end of the inlet and outlet facing the water stop recessed table is provided with a chamfer, and when the water stop element is at a cut-off position, the water stop sealing ring is in contact with the chamfer.

5. The composite filter element assembly of claim 2, wherein a mating flange is provided in the housing around the access opening, at least a portion of the water stop recess being located inboard of the mating flange, the water stop recess being welded to the mating flange.

6. The composite filter element assembly according to claim 5, wherein the inner peripheral surface of the fitting flange is formed into a multistage fitting stepped surface, the outer peripheral surface of the water stopping recessed table is provided with a water stopping stepped surface adapted to the fitting stepped surface, the convex angle of the fitting stepped surface is over against the concave angle of the water stopping stepped surface, and the concave angle of the fitting stepped surface is over against the convex angle of the water stopping stepped surface; wherein the content of the first and second substances,

and an interference bump is arranged between the at least one opposite reentrant corner and the convex corner, and the interference bump is a concentrated welding and melting area.

7. The composite filter element assembly of claim 6, wherein a flash channel is provided on the water stop step surface adjacent to the concentrated weld zone.

8. The composite filter element assembly according to claim 1, wherein the second accommodating cavity is located below the first accommodating cavity, the water pressure in the second accommodating cavity is greater than the water pressure in the first accommodating cavity, and the water stopping structures are arranged at the inlet and the outlet at the bottom of the second accommodating cavity.

9. The composite filter element assembly of claim 1, wherein the second filter group comprises: a reverse osmosis membrane element, the reverse osmosis membrane element comprising: the reverse osmosis membrane water purifier comprises a central tube group and a plurality of reverse osmosis membrane bags, wherein the central tube group comprises a central tube and a plurality of waste water collecting tubes arranged at intervals, the waste water collecting tubes are arranged around the central tube, filter water inlet holes are formed in the tube wall of the central tube, and waste water inlet holes are formed in the tube wall of the waste water collecting tubes;

the reverse osmosis membrane bags have a first portion located inside the center tube bank and a second portion located outside the center tube bank, each of the waste headers and the center tube being separated by at least one of the first portions of the reverse osmosis membrane bags, the second portions of the reverse osmosis membrane bags forming a multi-layered membrane module around the center tube bank.

10. The composite filter element assembly of claim 1, wherein the housing defines a first inlet/outlet, a second inlet/outlet, and a third inlet/outlet, the first filter element includes a first filter element, a second filter element, and a water-way partition plate, the water-way partition plate is disposed in the first receiving chamber, the water-way partition plate partitions the first receiving chamber into a first low-pressure region and a second low-pressure region, the first filter element is disposed in the first low-pressure region, water flowing from the first inlet/outlet flows through the first filter element and then flows out from the second inlet/outlet, the second filter element is disposed in the second low-pressure region, and water flowing from the transition port flows out from the third inlet/outlet after passing through the second filter element.