WO2020088558A1 - Composite filter element assembly - Google Patents

Abstract

Disclosed is a composite filter element assembly (1000), comprising a shell (300) and a spiral wound reverse osmosis membrane element (3) arranged in a high-pressure cavity (200) of the shell. One and the same end of the high-pressure cavity is provided with a high-pressure water inlet (302) and a high-pressure water outlet (301), and the opposite two ends of the high-pressure cavity are respectively provided with the high-pressure water outlet (301) and a low-pressure water passing port (332). The spiral wound reverse osmosis membrane element (3) comprises a central pipe set (13) and a plurality of reverse osmosis membrane bags (32). The central pipe set comprises a central pipe (33) located in the middle, and a plurality of waste water headers (34) surrounding the central pipe and arranged at intervals.

Description

Composite filter element assembly

Cross-reference of related applications

This application is based on the Chinese patent application "Compound Filter Assembly" with the application number 201811288599.8 and the application date on October 31, 2018 and the Chinese Patent Application "Composite Filter Assembly" with the application number 201821786300.7 and the application date on October 31, 2018 Filed and claimed the priority of the aforementioned Chinese patent application. The entire contents of the aforementioned Chinese patent application are hereby incorporated by reference into this application.

Technical field

The present application relates to the technical field of water purification, in particular to a composite filter element assembly.

Background technique

The tap water transported from the city water plant to each user usually contains a certain amount of salt ions, metal substances, chlorides, microorganisms, sediment and other substances. In order to improve the quality of drinking water, more and more families choose to install a water purifier on the tap water outlet pipe. The water purifier has a multi-function filter element to remove different types of harmful substances in the tap water.

The general filter element is not only complicated in structure, but also the unreasonable setting of high and low pressure areas. The high-pressure part is easy to cause pressure on the low-pressure part, which leads to problems such as water leakage and string flow in the pipeline.

Summary of the invention

This application aims to solve one of the technical problems in the related art at least to a certain extent.

For this reason, the purpose of the present application is to propose a composite filter element assembly. The flow path of the composite filter element assembly is simple in design, high in reliability, and good in purification and filtration effect.

A composite filter element assembly according to an embodiment of the present application includes a casing and a spirally wound reverse osmosis membrane element, a high-pressure chamber is defined in the casing, the high-pressure chamber has a high-pressure water inlet, and opposite ends of the high-pressure chamber are respectively provided There are a high-pressure water outlet and a low-pressure water outlet, the high-pressure water inlet and the high-pressure water outlet are located at the same end of the high-pressure chamber, the spiral wound reverse osmosis membrane element is provided in the high-pressure chamber, and the spiral wound Type reverse osmosis membrane element includes: a central tube group and a plurality of reverse osmosis membrane sheet bags, the central tube group includes a central tube and a plurality of spaced wastewater headers, the plurality of wastewater headers surround the central tube Set, the wall of the center pipe is provided with a filtered water inlet, the wall of the waste water header is provided with a waste water inlet, and the reverse osmosis membrane bag has a first part located inside the center pipe group And a second part located outside the central tube group, each of the wastewater header and the central tube is separated by at least one first part of the reverse osmosis membrane bag, a plurality of the reverse osmosis membrane bag The second part of the formation A multi-layer film assembly wound around the central pipe group; wherein one end of the central pipe is connected to the low-pressure water inlet, the other end of the central pipe is blocked and arranged, and one end of the wastewater header is connected to the The high-pressure water outlet is connected, and the other end of the waste water header is blocked. The pressurized water flows into the high-pressure chamber from the high-pressure water inlet and flows to the reverse osmosis membrane bag.

According to the composite filter element assembly of the embodiment of the present application, by setting the low-pressure water outlet and the high-pressure water outlet of the spirally wound reverse osmosis membrane element at both ends, it is beneficial to improve the filtration quality and reduce the sealing difficulty. The design of the composite filter element flow channel is simple, high reliability, and good purification and filtration effect.

In addition, the composite filter element assembly according to the present application may also have the following additional technical features:

Optionally, the composite filter assembly further includes a first sealing plate and a second sealing plate, the first sealing plate and the second sealing plate are respectively located at two axial ends of the spiral wound reverse osmosis membrane element , The central pipe and the wastewater header are both through pipes passing through at both ends, one end of the central pipe is blocked by the second sealing plate, and one end of the wastewater header is blocked by the first sealing plate Blocked.

Optionally, a first assembly tube and a second assembly tube are respectively provided on both sides of the first sealing plate, the first assembly tube is inserted at the low-pressure water inlet, and the second assembly tube is connected to the The center tube is plug-in connected, and the first assembly tube and the second assembly tube are in communication.

Optionally, a third assembly tube and a fourth assembly tube are respectively provided on both sides of the second sealing plate, the third assembly tube is plug-in connected with the wastewater header, and the fourth assembly tube is plug-in connected At the high-pressure water outlet, the third assembly pipe and the fourth assembly pipe are in communication.

Optionally, the first sealing plate is provided with a first blocking block inserted into the end of the wastewater header, and the second sealing plate is provided with a second blocking block inserted into the end of the central tube .

Optionally, the first sealing plate and the second sealing plate are respectively provided with a plurality of fixed-axis protrusions, the plurality of fixed-axis protrusions are spaced apart along the circumferential direction, and the plurality of fixed-axis protrusions The blocks respectively rest on the inner wall of the housing.

Optionally, the composite filter assembly further includes an outer sleeve filter sleeve, the outer sleeve filter sleeve is sleeved radially outward of the spirally wound reverse osmosis membrane element, and the high-pressure water inlet is located at a diameter of the outer sleeve filter sleeve To the outside.

Optionally, a low-pressure cavity is defined in the housing, the low-pressure cavity and the high-pressure cavity are separated by a transition plate, and the low-pressure water outlet is provided on the transition plate to communicate with the low-pressure cavity, the low pressure A first filter element is provided in the cavity.

Optionally, the housing is provided with a first inlet, a second inlet, and a third inlet. The low-pressure chamber is also provided with a second filter element and a waterway partition plate. The low-pressure chamber is spaced apart from a first low-pressure area and a second low-pressure area, the first filter element is disposed in the first low-pressure area, and the water flowing in from the first inlet and outlet passes through the first filter element from The second inlet and outlet flow out, the second filter element is provided in the second low-pressure area, and the water flowing in from the low-pressure water inlet flows out of the third inlet and outlet after passing through the second filter element.

Optionally, a first end structure and a second end structure are provided in the low-pressure chamber, the first filter element, the second filter element and the waterway partition plate are all cylindrical, and the first filter element, Both axial ends of the second filter and the waterway partition plate are connected to the first end structure and the second end structure.

Additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be learned through practice of the present application.

BRIEF DESCRIPTION

The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a schematic diagram of an internal structure of a composite filter element assembly according to an embodiment of the present application.

2 is a bottom view of a composite filter element assembly according to an embodiment of this application.

FIG. 3 is a schematic structural diagram of a housing of a composite filter element assembly and a water stop assembly according to an embodiment of the present application.

4 is a schematic view of the internal structure of a composite filter element assembly according to an embodiment of the present application when the spiral wound reverse osmosis membrane element and the first filter element and the second filter element are omitted.

5 is a schematic structural view of a spiral wound reverse osmosis membrane element, a first sealing plate, and a second sealing plate according to an embodiment of the present application.

6 is an enlarged view of the structure of part A in FIG. 5.

7 is an enlarged view of the structure of part B in FIG. 5.

FIG. 8 is a schematic structural view of a spiral wound reverse osmosis membrane element, a first sealing plate, and a second sealing plate in a comparison scheme of this application.

9 is an enlarged view of the structure of part C in FIG. 8.

FIG. 10 is an enlarged view of the structure of part D in FIG. 8.

FIG. 11 is an exploded schematic view of the structure of the central tube group of the composite filter element assembly according to an embodiment of the present application.

FIG. 12 is a plan view of a reverse osmosis membrane bag, a central tube, and a waste water header in accordance with an embodiment of the present application.

13 is a plan view of a spiral wound reverse osmosis membrane element in an embodiment of the present application.

14 is a schematic structural view of the first sealing plate according to an embodiment of the present application.

15 is a schematic diagram of a bottom view of a first sealing plate according to an embodiment of the present application.

16 is a schematic diagram of a bottom view of a second sealing plate according to an embodiment of the present application.

FIG. 17 is a schematic structural view of a second sealing plate according to an embodiment of the present application.

Reference mark:

Composite filter element assembly 1000;

Low-pressure chamber 100; first low-pressure area 1; second low-pressure area 2;

The first filter 10; the first uniform flow channel 11; the second uniform flow channel 12;

The first import and export 101; the second import and export 102;

The second filter 20; the third uniform flow channel 21; the fourth uniform flow channel 22;

The third import and export 201;

The first inner end cover 41;

The first outer end cap 42;

The second inner end cap 43;

The second outer end cap 44;

The second middle end cap 45;

Waterway partition 46;

Spacer bracket 49;

High-pressure chamber 200; spiral wound reverse osmosis membrane element 3; central tube group 13;

Fifth uniform flow channel 31; reverse osmosis membrane bag 32; center tube 33; filtered water inlet 333; filtered water outlet 334; wastewater header 34; wastewater inlet 341; wastewater outlet 342;

High-pressure water outlet 301; high-pressure water inlet 302;

The first board 47; the first assembly tube 471; the second assembly tube 472; the fixed shaft projection 473; the first block 474;

The second sealing plate 48; the third assembly tube 480; the fourth assembly tube 481; the second block 483;

Water stop assembly 50; Water stop structure recess 51; Spring 52; Seal ring 53; Water stop structure 54; Restriction platform 541;

Outer filter cartridge 60,

Housing 300;

First bottle cap 310; first takeover 311; second takeover 312; third takeover 313;

Second bottle cap 320;

Bottle body 330; transition plate 331; low-pressure water outlet 332.

detailed description

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

The composite filter element assembly 1000 according to an embodiment of the present application is described in detail below with reference to the drawings.

As shown in FIGS. 1, 5, and 11-13, a composite filter element assembly 1000 according to an embodiment of the present application includes a housing 300 and a spiral wound reverse osmosis membrane element 3, a high-pressure chamber 200 is defined in the housing 300, The high-pressure chamber 200 has a high-pressure water inlet 302, and opposite ends of the high-pressure chamber 200 are respectively provided with a high-pressure water outlet 301 and a low-pressure water outlet 332, whereby water can enter the high-pressure chamber 200 from the high-pressure water inlet 302, and then from the high-pressure water outlet 301 And low-pressure water outlet 332 water.

The high-pressure water inlet 302 and the high-pressure water outlet 301 are located at the same end of the high-pressure chamber 200, so that the water pressure entering the high-pressure chamber 200 from the high-pressure water inlet 302 and the water pressure flowing out of the high-pressure chamber 200 from the high-pressure water outlet 301 are substantially the same, thereby Therefore, the water pressure difference between the internal and external structural parts of the high-pressure chamber 200 at this end is not large, and the structural reliability of the high-pressure chamber 200 is improved.

The spiral wound reverse osmosis membrane element 3 is provided in the high-pressure chamber 200. The spiral wound reverse osmosis membrane element 3 is suitable for purifying the filtered water flow under a high-pressure differential environment. For the convenience of explanation here, the purified and filtered water passing through the spiral wound reverse osmosis membrane element 3 is referred to as filtered water, and the unpurified and filtered water passing through the spiral wound reverse osmosis membrane element 3 is referred to as wastewater. Water is pressurized outside the casing 300 by means of a booster pump, etc., and then high-pressure water enters the high-pressure chamber 200 from the high-pressure water inlet 302, and the high-pressure water flows to the spirally wound reverse osmosis membrane element 3 Separated into filtered water and waste water, filtered water flows out of the high-pressure chamber 200 from the low-pressure water outlet 332, and waste water flows out of the high-pressure chamber 200 from the high-pressure water outlet 301.

Specifically, as shown in FIGS. 11-13, the spiral wound reverse osmosis membrane element 3 includes a central tube group 13 and a reverse osmosis membrane bag 32, and the central tube group 13 includes a central tube 33 and a plurality of spaced wastewater collection A pipe 34 and a plurality of wastewater headers 34 are provided around the center pipe 33. The wall of the central tube 33 is provided with a filtered water inlet hole 333, and the wall of the waste water header 34 is provided with a waste water inlet hole 341.

The reverse osmosis membrane bag 32 has a first part located inside the central tube group 13 and a second part located outside the central tube group 13. Each wastewater header 34 and center tube 33 are separated by at least one first part of the reverse osmosis membrane bag 32, and the second parts of the plurality of reverse osmosis membrane bags 32 form a multilayer film surrounding the center tube group 13 Components.

Here, each reverse osmosis membrane bag 32 forms a spiral-shaped inner flow path, and the inner flow path is connected with a central tube 33 at the inner end of the spiral. A spiral outer flow channel is formed between two adjacent reverse osmosis membrane bags 32, and a waste water collection pipe 34 is connected to the outer flow channel at the inner end of the spiral. Multi-layer membrane modules made of 32 rolls of multiple reverse osmosis membrane bags increase the number of flow channels and have a very strong filtering capacity.

One end of the central pipe 33 is connected to the low-pressure water outlet 332, and the other end of the central pipe 33 is blocked. One end of the waste water header 34 is connected to the high-pressure water outlet 301, and the other end of the waste water header 34 is blocked. The pressurized water enters the high-pressure chamber 200 through the high-pressure water inlet 302 and flows to the reverse osmosis membrane bag 32.

Since the high-pressure chamber 200 is filled with high-pressure water, and the central pipe 33 is connected with a low-pressure water outlet 332, as a whole, the entire outer water pressure of the spirally wound reverse osmosis membrane element 3 is higher than the water pressure in the central pipe 33 Under the differential pressure lead, most of the high-pressure water flowing in from the high-pressure water inlet 302 passes along the radial direction of the spirally wound reverse osmosis membrane element 3, and the passing path is short and the flow volume is large. Moreover, it has a scouring effect on impurities on the surface of the membrane when it passes radially, and the water flow is more likely to wash away the impurities and then pass through the membrane.

Specifically, as the water flows through the reverse osmosis membrane bag 32 in the radial direction and flows toward the central tube 33, water molecules continuously permeate into the reverse osmosis membrane bag 32. The part of the filtered water that has penetrated into the reverse osmosis membrane bag 32 continues to flow toward the center tube 33 in the radial direction, and partly flows toward the center tube 33 in the spiral direction under the influence of the membrane extension direction. Finally, the filtered water enters the central tube 33 from the filtered water inlet hole 333, and then flows toward the low-pressure water outlet 332. The water that has not penetrated into the reverse osmosis membrane bag 32 is collected at the waste water header 34, and the accumulated waste water flows into the waste water header 34 from the waste water inlet hole 341, and then is discharged from the high-pressure water outlet 301.

It should be emphasized here that one of the salient features of the embodiments of the present application is that, as shown in FIG. One end. This is because the filtered water in the central pipe 33 is the clean water obtained after the high-pressure inlet water is filtered through the layers of membranes. It is necessary to cause a lot of pressure loss during the membrane passing process, so the final water pressure in the central pipe 33 is low . The unfiltered wastewater is finally collected at the wastewater header 34 without pressure loss. The water pressure in the wastewater header 34 is significantly higher than that in the central tube 33.

If the high-pressure water outlet 301 and the low-pressure water outlet 332 are provided at the same end of the high-pressure chamber 200, that is, filtered water and waste water as shown in FIG. 8 flow out from the same end, the quality risk of the filter element will increase. Because the central pipe 33 and the wastewater header 34 are adjacent to each other and the pressure difference between the pipes is large, and the dynamic pressure will increase the risk of seepage under the condition of water discharge. If the water is discharged from the same end of the two, the tube wall is deformed easily under pressure, and the sealing structure between the tube body and other components is also very easy to fail under the high pressure difference, resulting in series flow.

To avoid this problem, as shown in FIGS. 1, 5, 6 and 7, in this embodiment, one end of the center pipe 33 is connected to the low-pressure water outlet 332, and the other end of the center pipe 33 is blocked. One end of the waste water header 34 is connected to the high-pressure water outlet 301, and the other end of the waste water header 34 is blocked. The directions of filtered water and waste water effluent are exactly opposite, which greatly guarantees that the filtered water effluent and waste water effluent do not affect each other, avoiding the pressure and damage to the membrane and the central tube group 13 caused by the high pressure difference, and it also has The sealing requirements of the components connected to the element 3 are also greatly reduced, which greatly improves the quality assurance of the composite filter element assembly 1000.

Optionally, the spirally wound reverse osmosis membrane element 3 is placed vertically when in use, and the central tube 33 and the waste water header 34 therein are also placed vertically, the lower end of the central tube 33 is blocked, and the upper end is a filtered water outlet hole 334 . The upper end of the waste water header 34 is blocked, and the lower end is a waste water outlet 342.

In some embodiments of the present application, as shown in FIG. 1, the spirally wound reverse osmosis membrane element 3 is rolled into a cylindrical shape, and a fifth average is defined between the spirally wound reverse osmosis membrane element 3 and the inner wall of the high-pressure chamber 200布 流 道 31. From the layout of the spiral wound reverse osmosis membrane element 3 and the fifth uniform distribution channel 31, after the high-pressure inlet water flows in from the high-pressure inlet 302, it is mainly flushed in the axial direction and distributed evenly in the fifth uniform distribution flow Road 31. When the water flow passes through the spirally wound reverse osmosis membrane element 3, most of it passes through in the radial direction, the passing path is short, and the flow volume is large. In addition, it has a flushing effect on the impurities on the surface of the filter element when it passes radially, and the water flow axially flushed in the fifth uniform flow channel 31 is beneficial to bring the impurities under the flushing to one end in the axial direction and avoid the impurities from being blocked on the membrane surface.

In some embodiments of the present application, as shown in FIGS. 1 and 5, the composite filter element assembly 1000 further includes a first sealing plate 47 and a second sealing plate 48. The first sealing plate 47 and the second sealing plate 48 are located in the spiral The axial ends of the rolled reverse osmosis membrane element 3.

Both the central pipe 33 and the waste water collecting pipe 34 are through pipes passing through at both ends, one end of the central pipe 33 is blocked by the second sealing plate 48, and one end of the waste water collecting pipe 34 is blocked by the first sealing plate 47. As can be seen from the comparison between FIG. 6 and FIG. 9, the top end of the center tube 33 in FIG. 6 is penetrated, while the top end of the center tube 33 in FIG. 9 has a seal. Specifically, as shown in the comparison between FIG. 7 and FIG. 10, the bottom end of the center tube 33 in FIG. 7 is sealed by the second sealing plate 48, and the bottom of the center tube 33 in FIG. 9 is penetrated. The first sealing plate 47 and the second sealing plate 48 complete the connection and plugging of the central tube group 13, and the connection is convenient and the reliability is high.

Specifically, as shown in FIGS. 1 and 5, the first sealing plate 47 and the second sealing plate 48 can also seal the upper and lower ends of the reverse osmosis membrane bag 32. The first sealing plate 47 and the second sealing plate 48 can seal the two ends of the multiple reverse osmosis membrane bag 32, and provide a support connection for the spirally wound reverse osmosis membrane element 3, to avoid flowing out of the end surface without membrane filtration. Central tube group 13 to improve water quality guarantee. In order to make the fixing of the first sealing plate 47 and the second sealing plate 48 more reliable, the surfaces of the first sealing plate 47 and the second sealing plate 48 facing each other may be coated with sealant to realize the spiral wound reverse osmosis membrane element 3 Closed by glue. In this way, the first sealing plate 47 and the second sealing plate 48 are not easy to fall off, and the installation reliability is greatly improved. At the same time, the sealant can seal the two ends of the reverse osmosis membrane bag 32 better to prevent water leakage.

Optionally, as shown in FIGS. 1, 14 and 15, a first assembly tube 471 and a second assembly tube 472 are provided on both sides of the first sealing plate 47 respectively, and the first assembly tube 471 is inserted into the low-pressure water outlet At 332, the second assembly tube 472 is plug-connected to the center tube 33, and the first assembly tube 471 and the second assembly tube 472 are in communication. The first assembling pipe 471 and the second assembling pipe 472 make the assembly between the central pipe 33 and the first sealing plate 47, the first sealing plate 47, and the low-pressure water outlet 332 separate, which facilitates assembly and facilitates sealing.

Optionally, as shown in FIGS. 1, 16, and 17, a third assembly tube 480 and a fourth assembly tube 481 are provided on both sides of the second sealing plate 48, and the third assembly tube 480 is inserted into the wastewater header 34 After the connection, the fourth assembly pipe 481 is inserted at the high-pressure water outlet 301, and the third assembly pipe 480 and the fourth assembly pipe 481 communicate with each other. The third assembling tube 480 and the fourth assembling tube 481 separate the assembly between the central tube group 13 and the second sealing plate 48, the second sealing plate 48, and the high-pressure water outlet 301, which facilitates assembly and facilitates sealing.

Optionally, as shown in FIGS. 1 and 15, the first sealing plate 47 is provided with a first block 474 inserted into the end of the wastewater header 34. As shown in FIGS. 1 and 17, the second sealing plate 48 is provided with a second block 483 inserted into the end of the center tube 33. The cooperation between the blocking block and the central tube group 13 is convenient for locating and cooperating on the one hand, and can play a foolproof role on the other hand.

In addition, if the central pipe 33 and the waste water collecting pipe 34 are to be provided with pipes at both ends, the end sealing operation of the central pipe group 13 can also be facilitated. For example, a multi-layer seal may be provided between the first block 474 and the wastewater header 34, and a multi-layer seal may also be used between the second block 483 and the center pipe 33, which will not be repeated here. At this time, both the central pipe 33 and the waste water collecting pipe 34 must be made through pipes at both ends, which is much more convenient and time-saving than a blind pipe at one end.

Optionally, as shown in FIGS. 14-17, the first sealing plate 47 and the second sealing plate 48 are respectively provided with a plurality of fixed-axis projections 473, and the multiple fixed-axis projections 473 are spaced apart along the circumferential direction. The plurality of fixed-axis protrusions 473 respectively abut against the inner wall of the housing 300. The fixed-axis protrusions 473 may define the movement of the first sealing plate 47 and the second sealing plate 48 in the radial direction.

Here, the first sealing plate 47 and the second sealing plate 48 are provided at the axial ends of the spiral reverse osmosis membrane element 3, and are fixedly connected to the spiral wound reverse osmosis membrane element 3, which is beneficial to the spiral wound reverse osmosis membrane element 3 The connection between the first sealing plate 47, the second sealing plate 48, the low-pressure water outlet 332, and the high-pressure water outlet 301 is stable. There is a gap between the spiral wound reverse osmosis membrane element 3 and the housing 300 that allows high-pressure water to pass through, and the shaft-shaped protrusion 473 can also prevent the spiral wound reverse osmosis membrane element 3 from being squeezed and deformed on the inner wall of the housing 300 .

In some embodiments of the present application, as shown in FIG. 1, the composite filter element assembly 1000 further includes a jacket filter cartridge 60 that is sleeved radially outward of the spirally wound reverse osmosis membrane element 3, and the high-pressure water inlet 302 is located The radially outer side of the outer sleeve filter cartridge 60. After the high-pressure water enters the high-pressure chamber 200 from the high-pressure water inlet 302, it first passes through the outer sleeve filter cartridge 60 in the radial direction, after being purified and filtered by the outer sleeve filter cartridge 60, and then passes through the purification filter of the spiral wound reverse osmosis membrane element 3 to reduce the spiral The pressure of the purified filtered water of the wound reverse osmosis membrane element 3.

In some embodiments of the present application, as shown in FIGS. 1 and 3, a low-pressure chamber 100 is defined in the housing 300, and the low-pressure chamber 100 and the high-pressure chamber 200 are separated by a transition plate 331. The low-pressure water outlet 332 is provided on the transition plate 331 to communicate with the low-pressure chamber 100, and the first filter 10 is provided in the low-pressure chamber 100.

After the high-pressure water in the high-pressure chamber 200 is purified and filtered by the spiral wound reverse osmosis membrane element 3, it can be transformed into low-pressure filtered water, and then flows to the low-pressure chamber 100 through the low-pressure water inlet 332. It should be noted that the definition of low pressure and high pressure in this article does not limit the specific value of water pressure. Among them, the water pressure in the high pressure chamber 200 is higher than the municipal water supply pressure, and the water pressure in the low pressure chamber 100 is lower than that in the high pressure chamber 200. Water pressure.

Optionally, as shown in FIGS. 1-4, the housing 300 is provided with a first inlet 101, a second inlet 102, a third inlet 201, and a second filter 20 and The waterway partition plate 46 separates the low-pressure chamber 100 from the first low-pressure area 1 and the second low-pressure area 2. The first filter element 10 is provided in the first low-pressure zone 1, and the water flowing in from the first inlet and outlet 101 flows out of the second inlet and outlet 102 after passing through the first filter element 10. The second filter element 20 is provided in the second low-pressure region 2, and the water flowing in from the low-pressure water outlet 332 passes through the second filter element 20 and flows out from the third inlet 201. In other words, the water channel partition plate 46 separates the first filter 10 and the second filter 20 in the low-pressure chamber 100 to form two independent purified water channels.

Optionally, other filter elements can be connected between the first filter element 10 and the second filter element 20; the first inlet 101 and the third inlet 201 can also be directly connected, or the second inlet 102 and the second The three inlets and outlets 201 are connected, so that the purified water path between the first filter element 10 and the second filter element 20 forms a series relationship between front and back.

Optionally, as shown in FIG. 1, a first uniform flow channel 11 is defined between the first filter 10 and the inner wall of the low-pressure chamber 100, and the first uniform flow channel 11 is connected to the first inlet 101. Here, the liquid to be purified by the first filter element 10 may be evenly distributed in the first uniform flow channel 11, or the purified liquid of the first filter element 10 may be evenly distributed.

A second uniform flow channel 12 is defined between the waterway partition plate 46 and the first filter 10. Here, when the liquid to be purified of the first filter 10 is uniformly distributed in the first uniform flow channel 11, the liquid after the purification of the first filter 10 is uniformly distributed in the second uniform distribution channel 12; . The second uniform flow channel 12 is connected to the second inlet and outlet 102. That is, when the first import and export 101 is an import, the second import and export 102 is an export; otherwise, it may be.

A third uniformly distributed flow channel 21 is defined between the waterway partition plate 46 and the second filter element 20. A fourth uniformly distributed flow channel 22 is provided on the side of the second filter element 20 away from the third uniformly distributed flow channel 21. One of the three uniform distribution channels 21 and the fourth uniform distribution channel 22 is connected to the third inlet and outlet 201, and the other of the third uniform distribution channel 21 and the fourth uniform distribution channel 22 is connected to the low-pressure water outlet 332. Here, when the third uniform flow channel 21 is connected to the low-pressure water outlet 332, the fourth uniform flow channel 22 is connected to the third inlet 201; when the third uniform flow channel 21 is connected to the third inlet 201, the first The four uniform distribution channels 22 are connected to the low-pressure water outlet 332.

Specifically, as shown in FIGS. 1 and 3, the low-pressure chamber 100 and the high-pressure chamber 200 are spaced apart in the axial direction, and one of the uniform flow channels on both sides of the second filter element 20 passes through the low-pressure water outlet 332 on the transition plate 331 The high-pressure chamber 200 is connected, and the two accommodating chambers (100, 200) are compactly matched, which saves the external connection pipes that need to be laid when the water filtered by the spiral wound reverse osmosis membrane element 3 flows to the second filter 20 for filtration. It is advantageous for the composite filter element assembly 1000 to reduce the overall size. Helps simplify the layout of external piping.

Specifically, the first filter element 10, the second filter element 20 and the waterway partition plate 46 are all cylindrical, the first uniformly distributed flow channel 11, the second uniformly distributed flow channel 12, the third uniformly distributed flow channel 21 and the fourth The uniformly distributed flow channels 22 are sequentially sleeved, and the fourth uniformly distributed flow channels 22 are located in the center of the low pressure chamber 100.

From the layout positions of the first uniform flow channel 11, the second uniform flow channel 12, the third uniform flow channel 21, and the fourth uniform flow channel 22, the water flow passes through the first filter 10 and the second When the filter 20 is used, most of it passes in the radial direction of the low-pressure chamber 100, with a short passage path and a large flow rate. In addition, it has a flushing effect on the impurities on the surface of the filter when passing radially, and the water flow is more likely to wash away the impurities and then pass through the filter. Most of the water flow of each filter element flows in the axial direction when entering and leaving the water, which is not only conducive to the uniform distribution of the water flow, but also helps to bring the impurities under scouring to the axial end and avoid the impurities from being blocked on the surface of the filter element.

Optionally, as shown in FIG. 1, a first end structure and a second end structure are provided in the low-pressure chamber 100, and both axial ends of the first filter element 10, the second filter element 20 and the water channel partition plate 46 are connected at The first end structure and the second end structure.

The first end structure and the second end structure can block both ends of the first filter element 10, the second filter element 20 and the water channel partition plate 46, prevent cross flow, and affect the purification and filtering effect of water. Moreover, the first end structure and the second end structure provide end support for the first filter element 10, the second filter element 20, and the water channel partition plate 46, which facilitates the integration of the three into an integrated structure.

Compared with the integration of two sets of filter elements in one filter element assembly in the prior art, the present application has a higher degree of integration and stronger functions. When replacing the filter element, it is only necessary to disassemble the different ends of the housing 300 and the corresponding end caps of each filter element, and the corresponding filter element can be replaced. The replacement is simple and easy to operate, which provides the possibility for the customer to perform the replacement in person. Reduced maintenance costs.

Even if the filter element in the accommodating cavity cannot be removed after being installed, since all the filter elements are set in the housing 300, the composite filter element assembly 1000 needs only one set of positioning and installation structure for overall installation, which is simple and time-saving to assemble.

To better understand the solution of the embodiment of the present application, the structure of the composite filter element assembly 1000 in a specific embodiment of the present application will be described below with reference to FIGS. 1 to 17.

The following specific embodiments use purified tap water as an example to describe the three-stage filtration function of the composite filter element assembly 1000, and explain the highly integrated integrated design structure of the composite filter element assembly 1000. In addition, the first filter 10 is described by taking a roll-type primary filter wound by rolling a non-woven fabric, a polypropylene layer, carbon fiber, and a spacer 49 as an example; the filter membrane is a high-water-saving lateral flow reverse osmosis node The water membrane will be described as an example of intermediate filtration. The second filter 20 will be described by using a cylindrical hollow carbon rod as a final filtration.

As shown in FIGS. 1, 2, 3, and 4, a composite filter element assembly 1000, the entire composite filter element assembly 1000 is normally installed in a vertical state. The housing 300 of the composite filter element assembly 1000 includes a bottle body 330 with open ends and a first bottle cap 310 and a second bottle cap 320 closed at both ends. Each bottle cap and the bottle body 330 are sealed by matching threads connection. Add seals at the seals. The first bottle cap 310 is provided with a first inlet and outlet 101 for tap water, a second inlet and outlet 102 for pre-water outlet, and a third inlet 201 for drinking water outlet. The second bottle cap 320 is provided with a high-pressure water inlet 302 for reverse osmosis pre-water inlet and a high-pressure water outlet 301 for reverse osmosis high-salinity wastewater drainage.

As shown in FIG. 1, a water stop assembly 50 is provided at the high-pressure water outlet 301 and the high-pressure water inlet 302. Taking the water stop assembly 50 at the high-pressure water inlet 302 in FIG. 3 as an example, the water stop assembly 50 includes a water stop structure recess 51, a spring 52, a seal ring 53, and a water stop structure 54. The water stop structure recess 51 is fixed in the second bottle cap 320, the water stop structure recess 51 is open toward the high-pressure water inlet 302, and the water stop structure recess 51 is provided with a through hole for passing water. The water stop structure 54 is telescopically disposed in the recess 51 of the water stop structure. A part of the water stop structure 54 extends to the high-pressure water inlet 302. The water stop structure 54 is provided with a restriction table 541, which has a diameter greater than The diameter of the high-pressure water inlet 302. The spring 52 is located in the recess 51 of the water stop structure and stops against the water stop structure 54, so that the restriction table 541 has a tendency to protrude toward the high-pressure water inlet 302. The water stop structure 54 is provided with a ring of sealing ring 53. When the spring 52 can overcome the pressure of the water flow, the spring 52 stops the sealing ring 53 at the end surface of the high-pressure water inlet 302 to block the high-pressure water inlet 302. When an external connecting pipe is connected to the high-pressure water inlet 302, a pin is inserted on the external connecting pipe to the high-pressure water inlet 302, so that the high-pressure water inlet 302 is opened. Once the external connecting pipe is unplugged from the high-pressure water inlet 302, the high-pressure water inlet 302 can be automatically closed by the water stop assembly 50. The setting of the water stop assembly 50 can facilitate the insertion of the composite filter element assembly 1000 to the external connecting pipe.

As shown in FIG. 1, the interior of the housing 300 is integrally formed with a transition plate 331 that is perpendicular to the wall of the barrel, and the transition plate 331 axially separates the housing 300 to form a low-pressure chamber 100 and a high-pressure chamber 200. The transition plate 331 There is a low-pressure water outlet 332 axially penetrating in the middle of.

As shown in FIG. 1, two sets of nested filter units are provided in the low-pressure chamber 100, the first filter element 10 provided on the outer side serves as the primary filter unit, and the second filter element 20 provided on the inner side serves as the final filter unit. The axial length of the first filter element 10 is greater than the axial length of the second filter element 20, and the first filter element 10 and the second filter element 20 are separated by a cylindrical waterway partition plate 46. An annular first uniform flow channel 11 is defined between the first filter element 10 and the inner wall of the low-pressure chamber 100, and the first uniform flow channel 11 is connected to the first inlet 101. An annular second uniform flow channel 12 is defined between the waterway partition plate 46 and the first filter element 10, and the second uniform flow channel 12 is connected to the second inlet and outlet 102. An annular third uniform flow channel 21 is defined between the waterway partition plate 46 and the second filter element 20, and a cylindrical fourth uniform flow channel 22 is provided in the center of the second filter element 20. The third uniform distribution channel 21 is connected to the low-pressure water outlet 332, and the fourth uniform distribution channel 22 is connected to the third inlet and outlet 201. A spacing bracket 49 is provided in the second uniform flow channel 12.

As shown in FIGS. 1 and 4, both axial ends of the first filter element 10, the second filter element 20 and the water channel partition plate 46 are connected to the first end structure and the second end structure. The first end structure includes: a first inner end cover 41, a first outer end cover 42, and the second end structure includes: a second inner end cover 43, a second outer end cover 44, and a second middle end cover 45.

A second inner end cap 43 is provided at the upper end of the second filter element 20, and a first inner end cap 41 is provided at the lower end of the second filter element 20. A second outer end cap 44 is provided at the upper end of the first filter element 10, and a first outer end cap 42 is provided at the lower end of the first filter element 10. A waterway partition plate 46 is integrally formed on the first outer end cap 42. A second middle end cap 45 is sleeved between the second outer end cap 44 and the second inner end cap 43. The second middle end cap 45 is fitted on the top peripheral wall of the waterway partition plate 46.

The first bottle cap 310 is provided with a first tube 311, a second tube 312, and a third tube 313 in this order. The first tube 311 and the second inner end cap 43 are inserted and connected, and the first tube 311 and the second tube The end cover 43 is plug-in connected, the second connection tube 312 is connected to the second middle end cover 45, and the third connection tube 313 is connected to the second outer end cover 44. Sealing rings 53 are provided at the positions of the first connecting pipe 311, the second connecting pipe 312 and the third connecting pipe 313 to further ensure the sealing effect.

As shown in FIG. 1, the spiral wound reverse osmosis membrane element 3 is provided in the high-pressure chamber 200, and a fifth uniformly distributed flow channel 31 is defined between the spiral wound reverse osmosis membrane element 3 and the inner wall of the high-pressure chamber 200. The center tube 33 in the center of the reverse osmosis membrane element 3 is provided facing the low-pressure water outlet 332. The wall of the central pipe 33 is provided with a filtered water inlet hole 333. The central pipe 33 is formed in a ring shape and is provided with five waste water collecting pipes 34.

The entire tap water filtration process is that tap water enters the first uniform flow channel 11 from the first inlet and outlet 101 and flows radially inward, and after filtering by the first filter 10, flows to the second uniform flow channel 12 and from The upper second inlet / outlet 102 flows out as pre-water. The outgoing pre-water is pressurized and pumped into the high-pressure water inlet 302, and is evenly distributed in the fifth uniform flow channel 31, which flows in from the side of the lateral flow reverse osmosis water-saving membrane and is spirally wound reverse osmosis membrane Element 3 filters, high-concentration wastewater is collected by the wastewater header 34 and discharged from the high-pressure water outlet 301, and pure water is collected upward by the central pipe 33 and passes through the low-pressure water outlet 332. Pure water enters the third uniform distribution channel 21 from the low-pressure water outlet 332, and is filtered by the second filter 20, enters the fourth uniform distribution channel 22, and flows out of the third inlet 201 for drinking.

Other configurations of the composite filter element assembly 1000 according to the embodiments of the present application, such as the filtering function of each filter assembly and the selection of the material of each filter assembly, are known to those of ordinary skill in the art, and will not be described in detail here.

In the description of this specification, the description with reference to the terms "embodiments", "examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application . In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art may understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and purpose of the present application, The scope of the application is defined by the claims and their equivalents.

Claims (10)

1. A composite filter element assembly is characterized by comprising:

   A casing, a high-pressure chamber is defined in the casing, the high-pressure chamber has a high-pressure water inlet, opposite ends of the high-pressure chamber are respectively provided with a high-pressure water outlet and a low-pressure water outlet, the high-pressure water inlet and the high-pressure outlet The nozzle is located at the same end of the high-pressure chamber;

   A spiral wound reverse osmosis membrane element, the spiral wound reverse osmosis membrane element is provided in the high-pressure cavity, the spiral wound reverse osmosis membrane element includes: a central tube group and a plurality of reverse osmosis membrane sheet bags, the The central tube group includes a central tube and a plurality of spaced-apart wastewater headers, and a plurality of the wastewater headers are arranged around the central tube, and the wall of the central tube is provided with filtered water inlet holes, and the wastewater collector The pipe wall is provided with waste water inlet holes;

   The reverse osmosis membrane bag has a first portion located inside the central tube group and a second portion located outside the central tube group, each of the wastewater header and the central tube is separated by at least one of the reverse osmosis The first portion of the membrane bag is spaced apart, and the second portions of the plurality of reverse osmosis membrane bags form a multilayer membrane assembly surrounding the central tube group; wherein,

   One end of the center pipe is connected to the low-pressure water outlet, the other end of the center pipe is blocked, and one end of the waste water header is connected to the high-pressure outlet, and the other end of the waste water header is blocked It is provided that the pressurized water flows into the reverse osmosis membrane bag after entering the high-pressure chamber through the high-pressure water inlet.
2. The composite filter element assembly according to claim 1, further comprising: a first sealing plate and a second sealing plate, the first sealing plate and the second sealing plate are respectively located in the spiral wound reverse osmosis The axial ends of the membrane element;

   The central pipe and the waste water collecting pipe are both through pipes passing through at both ends, one end of the central pipe is blocked by the second sealing plate, and one end of the waste water collecting pipe is sealed by the first sealing plate Blocking.
3. The composite filter element assembly according to claim 2, wherein a first assembly tube and a second assembly tube are respectively provided on both sides of the first sealing plate, and the first assembly tube is inserted in the low pressure At the nozzle, the second assembly tube is plug-connected to the center tube, and the first assembly tube and the second assembly tube are in communication.
4. The composite filter element assembly according to claim 2 or 3, wherein a third assembly tube and a fourth assembly tube are provided on both sides of the second sealing plate, respectively, the third assembly tube and the wastewater collection Pipes are connected in a plug-in manner, the fourth assembly pipe is inserted at the high-pressure water outlet, and the third assembly pipe and the fourth assembly pipe are in communication.
5. The composite filter element assembly according to claim 2 or 3 or 4, wherein the first sealing plate is provided with a first blocking block inserted into the end of the wastewater header, and the second sealing plate A second block is inserted into the end of the central tube.
6. The composite filter element assembly according to any one of claims 2 to 5, wherein the first sealing plate and the second sealing plate are respectively provided with a plurality of fixed-axis protrusions, and a plurality of the fixed The shaft protrusions are spaced apart along the circumferential direction, and a plurality of the fixed shaft protrusions respectively stop against the inner wall of the housing.
7. The composite filter element assembly according to any one of claims 1 to 6, further comprising: an outer sleeve filter sleeve, the outer sleeve filter sleeve is sleeved radially outside the spirally wound reverse osmosis membrane element, so The high-pressure water inlet is located radially outside of the outer sleeve filter cartridge.
8. The composite filter element assembly according to any one of claims 1 to 7, wherein a low-pressure cavity is defined in the housing, the low-pressure cavity and the high-pressure cavity are separated by a transition plate, and the low-pressure water outlet It is provided on the transition plate to communicate with the low-pressure chamber, and a first filter is provided in the low-pressure chamber.
9. The composite filter element assembly according to claim 8, wherein the housing is provided with a first inlet, a second inlet, and a third inlet, and a second filter element and A waterway partition plate, which separates the low-pressure chamber from a first low-pressure area and a second low-pressure area, the first filter element is disposed in the first low-pressure area, and flows in from the first inlet and outlet Of water flows out of the second inlet and outlet after passing through the first filter element, the second filter element is located in the second low pressure area, and the water flowing in from the low pressure water inlet passes through the second filter After that, it flows out from the third inlet and outlet.
10. The composite filter element assembly according to claim 9, wherein a first end structure and a second end structure are provided in the low-pressure cavity, and the first filter element, the second filter element, and the waterway partition plate are all In the shape of a cylinder, both axial ends of the first filter element, the second filter element, and the waterway partition plate are connected to the first end structure and the second end structure.

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