A composite filter element assembly and a water purification system

Abstract

The present invention provides a composite filter element assembly and a water purification system. The composite filter element assembly includes a pretreatment filter element (1) and a fine treatment filter element (2), and further includes a central tube (3). The fine treatment filter element (2) is a spiral wound membrane and is wound around the central tube (3). The central tube (3) is made of a material that allows a fluid passage, and the inner wall surface of the central tube (3) is a first concave curved surface, and / or the inner wall surface of the pretreatment filter element (1) also forms a second concave curved surface. By means of the present invention, while ensuring or improving the filtration effect, the overall volume of the composite filter element assembly can be reduced. Under the same volume, the filtration area of the filter element is increased, the filtration efficiency is improved, and at the same time, the effects of achieving the filtration effect and reducing the volume of the filter element are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purification, and particularly relates to a composite filter element assembly and a water purification system. Background Art

[0002] At present, water purifiers in the market have become more and more common, and people's requirements for water purifiers are getting higher and higher. The filter elements used in water purifiers are also various. From single-stage filter elements to multi-stage filter elements, among which, when a multi-stage filter element composed of an antibacterial PP cotton filter element, an activated carbon filter element, and an ultrafiltration membrane filter element realizes hierarchical filtration, the overall design is relatively complex. In order to ensure the filtration effect, adding multi-stage filtration leads to problems such as large volume and low filtration efficiency.

[0003] Due to the technical problems such as large volume and low filtration efficiency existing in the multi-stage filter element assembly in the prior art, the present invention researches and designs a composite filter element assembly and a water purification system. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the composite filter element assembly in the prior art cannot ensure the filtration efficiency while reducing the volume, so as to provide a composite filter element assembly and a water purification system.

[0005] The present invention provides a composite filter element assembly, which includes:

[0006] A pretreatment filter element and a fine treatment filter element, and further includes a central tube. The fine treatment filter element is a spiral wound membrane wound around the central tube. The central tube is made of a material that can allow a fluid passage, and the inner wall surface of the central tube forms a first concave curved surface, and / or the inner wall surface of the pretreatment filter element also forms a second concave curved surface.

[0007] Preferably,

[0008] The filter material that can allow fluid to pass through includes at least one of carbon material, polypropylene (PP) material, and ceramic material; and / or, the fine treatment filter element is a reverse osmosis membrane.

[0009] Preferably,

[0010] The central tube is a cylindrical carbon rod structure composed of the carbon material; or, the central tube is a cylindrical PP structure composed of the polypropylene (PP) material; or, the central tube is a cylindrical ceramic tube structure composed of the ceramic material.

[0011] Preferably,

[0012] The pre-treatment filter element includes a first-stage pre-treatment filter element and a second-stage pre-treatment filter element. The first-stage pre-treatment filter element is disposed on the radial outer periphery of the second-stage pre-treatment filter element, and the inner wall surface of the second-stage pre-treatment filter element forms the second concave curved surface.

[0013] Preferably,

[0014] A first groove is further provided on the inner wall surface of the central tube; and / or, a second groove is further provided on the inner wall surface of the second-stage pre-treatment filter element.

[0015] Preferably,

[0016] When the first groove is included, there are a plurality of the first grooves and they are uniformly distributed along the inner wall surface of the central tube; when the second groove is included, there are a plurality of the second grooves and they are uniformly distributed along the inner wall surface of the second-stage pre-treatment filter element.

[0017] Preferably,

[0018] A first support framework is further provided on the inner periphery of the central tube. The shape of the first support framework matches the shape of the inner wall surface of the central tube and is also a concave curved surface structure; and / or, a second support framework is further provided on the inner periphery of the second-stage pre-treatment filter element. The shape of the second support framework matches the shape of the inner wall surface of the second-stage pre-treatment filter element and is also a concave curved surface structure.

[0019] Preferably,

[0020] The material of the first-stage pre-treatment filter element is PP cotton, and the material of the second-stage pre-treatment filter element is activated carbon; and / or, the first-stage pre-treatment filter element is a cylindrical structure, and the second-stage pre-treatment filter element is a cylindrical structure and its inner wall surface is a concave curved surface.

[0021] Preferably,

[0022] It further includes an ultrafiltration filter element disposed on the radial inner periphery of the central tube, and there is at least one ultrafiltration filter element.

[0023] The present invention further provides a water purification system, which includes the composite filter element assembly described in any one of the previous items.

[0024] A composite filter element assembly and a water purification system provided by the present invention have the following beneficial effects:

[0025] By making the inner wall surface of the central tube into a first concave curved surface, the present invention can effectively increase the contact area between the fluid inside the central tube and it, and also effectively increase the contact area between the fluid outside the central tube and it, thereby effectively enhancing the filtration effect. The pre-treatment filter element is also set to include an inner wall surface with a second concave curved surface, which can also effectively increase the contact area between the fluid inside the pre-treatment filter element and it, and also effectively increase the contact area between the fluid outside the pre-treatment filter element and it, thereby effectively enhancing the filtration effect. Therefore, while ensuring or improving the filtration effect, the overall volume of the composite filter element assembly can be made smaller. Under the same volume, the filtration area of the filter element is increased, the filtration efficiency is improved, and the effects of achieving the filtration effect and reducing the volume of the filter element are realized at the same time. And by providing a structure with a first groove and a second groove formed on the first concave curved surface and / or the second concave curved surface, the contact area between the wall surface and the fluid can be further increased, the filtration effect can be further improved, and further, under the same volume, the filtration area of the filter element is increased, the filtration efficiency is improved, or the volume of the filter element is reduced on the basis of the same or improved filtration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic internal sectional structure view of the composite filter element assembly of the present invention.

[0027] The reference numerals in the figure are shown as:

[0028] 1, pre-treatment filter element; 11, first-stage pre-treatment filter element; 12, second-stage pre-treatment filter element; 13, second groove; 2, fine-treatment filter element; 3, central tube; 31, first groove; 4, ultrafiltration filter element; 5, bottle body; 6, upper cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] As Figure 1 shown, the present invention provides a composite filter element assembly, which includes:

[0030] A pre-treatment filter element 1 and a fine-treatment filter element 2, and further includes a central tube 3. The fine-treatment filter element 2 is a spiral wound membrane and is wound around the central tube 3. The central tube 3 is made of a material that can allow fluid passage, and the inner wall surface of the central tube 3 is a first concave curved surface, and / or the pre-treatment filter element 1 also includes an inner wall surface formed as a second concave curved surface.

[0031] By making the inner wall surface of the central tube into a first concave curved surface, the present invention can effectively increase the contact area between the fluid inside the central tube and it, and also effectively increase the contact area between the fluid outside the central tube and it, thereby effectively enhancing the filtration effect. The pre-treatment filter element is also set to have an inner wall surface including a second concave curved surface, which can also effectively increase the contact area between the fluid inside the pre-treatment filter element and it, and also effectively increase the contact area between the fluid outside the pre-treatment filter element and it, thereby effectively enhancing the filtration effect. Therefore, while ensuring or improving the filtration effect, the overall volume of the composite filter element assembly can be made smaller. Under the same volume, the filtration area of the filter element is increased, the filtration efficiency is improved, and the effects of achieving the filtration effect and reducing the volume of the filter element are realized. By setting the central tube to a structure allowing fluid to pass through (preferably a carbon rod), and winding the reverse osmosis membrane on the central tube, compared with the existing structure that still needs to set a central tube outside the carbon rod to wind the RO membrane, the structure of the central tube is effectively omitted, the volume of the wound reverse osmosis composite filter element is reduced, and the space of the composite filter element is reduced.

[0032] Preferably,

[0033] The filter material that can allow fluid to pass through includes at least one of carbon material, polypropylene pp material, and ceramic material; and / or, the fine treatment filter element 2 is a reverse osmosis membrane. This is the preferred material of the filter material of the present invention, which can effectively allow water to pass through, and in addition, can also filter the water passing through it. While the central tube realizes the support function, it can also form a primary filtration effect, overcoming the defect of volume increase caused by the increase in the number of filter element stages, reducing the volume and saving costs.

[0034] Preferably,

[0035] The central tube 3 is a cylindrical carbon rod structure made of the carbon material; or, the central tube 3 is a cylindrical PP structure made of the polypropylene pp material; or, the central tube 3 is a structure of a cylindrical ceramic tube made of the ceramic material. The filter media that can allow fluid to pass through in the present invention may include: carbon rods, cylindrical polypropylene pp material filter media, ceramic tubes, etc. Preferably, carbon that can improve the taste is used as the material of the central tube of the spiral wound membrane element, and the plastic central tube used in the existing spiral wound membrane can be discarded. By avoiding the use of the plastic central tube of the existing spiral wound membrane element, a spiral wound membrane element can achieve a two-stage filtration function; by using a carbon central tube, the subsequent use of a taste filter element can be avoided, and the spiral wound membrane element integrates the two-stage filtration functions of a fine filtration filter element and a post-taste filter element; the carbon central tube has no macro pores visible to the naked eye, and its surface is covered with structural micropores. Compared with the central tube with visible macro pores of the traditional plastic part, the water production of the spiral wound membrane sheet is easier to collect. The PP cylindrical central tube can effectively remove various particulate impurities in the filtered liquid, can be of a multi-layer deep structure, has a large dirt holding capacity, a large filtration flow rate, a small pressure difference, does not contain any chemical adhesives, is more hygienic and safe, is resistant to acids, alkalis, organic solutions, and oils, and has good chemical stability, integrating surface, deep layer, and coarse and fine filtration; it has the characteristics of a large flow rate, corrosion resistance, high pressure resistance, and low cost. It is used to block large particulate substances such as rust, sediment, and insect eggs in water. The ceramic cylindrical central tube can filter, antibacterialize, and activate drinking water, remove harmful residual chlorine, suspended pollutants, organic chemicals, colors, and odors, and can filter out drinking water meeting certain drinking standards by using this filter element.

[0036] Preferably,

[0037] The pretreatment filter element 1 includes a first-stage pretreatment filter element 11 and a second-stage pretreatment filter element 12. The first-stage pretreatment filter element 11 is disposed on the outer periphery in the radial direction of the second-stage pretreatment filter element 12, and the inner wall surface of the second-stage pretreatment filter element 12 is formed into the second concave curved surface. This is the specific position where the second concave curved surface of the pretreatment filter element of the present invention is formed, that is, formed on the inner periphery in the radial direction (on the inner wall surface) of the second-stage pretreatment filter element, which can effectively increase the contact area between the fluid passing through the inner periphery of the second-stage pretreatment filter element and the second-stage pretreatment filter element, improve the filtration effect, and can also reduce the overall volume of the composite filter element (compared with the existing composite filter element, the volume can be reduced when the filtration effect is the same, and the filtration effect can be improved when the volume is the same).

[0038] Preferably,

[0039] A first groove 31 is further provided on the inner wall surface of the central tube 3; and / or, a second groove 13 is further provided on the inner wall surface of the second-stage pretreatment filter element 12. By providing the first groove and the second groove on the first concave curved surface and / or the second concave curved surface, the contact area between the wall surface and the fluid can be further increased, the filtering effect can be further improved, and the filtering area of the filter element can be increased under the same volume, thereby improving the filtering efficiency, or reducing the volume of the filter element on the basis of the same or improved filtering effect.

[0040] Preferably,

[0041] When the first groove 31 is included, the first groove 31 is multiple and evenly distributed on the inner wall surface of the central tube 3; when the second groove 13 is included, the second groove 13 is multiple and evenly distributed on the inner wall surface of the second-stage pretreatment filter element 12. This is a further preferred structural form of the first groove and the second groove of the present invention, which can further effectively increase the contact area between the filter element and the fluid, improve the filtering effect, or reduce the overall volume of the filter element when the filtering effect is the same.

[0042] Preferably,

[0043] A first support skeleton (not shown) is further provided on the inner circumference of the central tube 3, and the shape of the first support skeleton matches the shape of the inner wall surface of the central tube 3 and is also a concave curved surface structure; and / or, a second support skeleton (not shown) is further provided on the inner circumference of the second-stage pretreatment filter element 12, and the shape of the second support skeleton matches the shape of the inner wall surface of the second-stage pretreatment filter element 12 and is also a concave curved surface structure. The first support skeleton can effectively support the carbon rod central tube, and the second support skeleton can also effectively support the second-stage pretreatment filter element, improving the structural strength of the carbon rod, and the concave curved surface with a matching shape can strengthen the bonding area and improve the bonding strength.

[0044] Preferably,

[0045] The material of the first-stage pretreatment filter element 11 is PP cotton, and the material of the second-stage pretreatment filter element 12 is activated carbon; and / or, the first-stage pretreatment filter element 11 is in a cylindrical structure, and the second-stage pretreatment filter element 12 is in a cylindrical structure and its inner wall surface is a concave curved surface. This is the respective material of the two-stage pretreatment filter element of the present invention and the preferred structural form. The PP cotton can filter out large-particle impurities such as sediment, the activated carbon can adsorb residual chlorine, etc., and the cylindrical structure is convenient for internal and external nesting.

[0046] Preferably,

[0047] It further includes an ultrafiltration filter element 4 disposed on the radial inner periphery of the central tube 3, and there is at least one ultrafiltration filter element 4. This is a preferred structural form of the post-filter of the present invention. The ultrafiltration filter element can effectively sterilize and filter water, and preferably there is one post-filter.

[0048] The present invention also provides a water purification system, which includes the composite filter element assembly described in any one of the previous items.

[0049] The present invention is to make the cylindrical filter element body have an overall concave curved surface, and at the same time open multiple grooves on the filter element body. Under the same volume, the filtration area of the filter element is increased, and the filtration efficiency is improved; the volume of the system filtration effect is reduced, and at the same time, the problems of large occupied space of the filter element and low filtration efficiency are effectively solved.

[0050] The composite filter element of the present invention includes an upper cover and a bottle body (see the appendix Figure 1 ). The interior of the bottle body involves multi-stage filtration, including a pretreatment filter element, a fine filter, and a post-treatment filter element. The pretreatment consists of PP cotton and granular activated carbon; the fine treatment consists of a reverse osmosis membrane; the post-treatment consists of a carbon rod and an ultrafiltration membrane. The water ports consist of a raw water port, a pure water port, and a waste water port. The first-stage filtration is arranged in the upper half of the filter element and includes materials such as PP cotton and activated carbon; the second-stage filtration is arranged in the lower half of the filter element and includes a reverse osmosis membrane, a carbon rod central tube, and an ultrafiltration membrane; the filter element includes PP cotton, activated carbon, a reverse osmosis membrane, a carbon rod central tube, and an ultrafiltration membrane. By making the carbon rod central tube concave, the contact area with water is increased under the same filtration area, the volume of the filter element is smaller, and the filtration effect is improved; at the same time, in order to better increase the filtration area, multiple grooves are designed on the central tube body. The grooves can be formed into multiple strip-shaped grooves, and can also be formed into multiple circular grooves.

[0051] Analysis of the water purification water circuit system: The entire water purification water circuit system is as follows Figure 1 , tap water enters from the raw water port, the water flow flows from both sides to the upper half of the filter element, and after passing through the PP cotton and granular activated carbon filter elements in sequence, the filtered water gathers in the upper central tube and flows into both sides of the lower half of the filter element. After passing through the reverse osmosis membrane and the carbon rod central tube in sequence, the filtered water gathers in the carbon rod central tube, and then passes through the ultrafiltration membrane for filtration. Finally, the whole raw water filtration is completed, and the pure water flows out from the pure water port in the middle. The waste water outlet is that the water flow passes through both sides of the lower half of the filter element, flushes the reverse osmosis membrane, so as to achieve flushing, and the waste water flows out from the waste water port.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present invention.

Claims

1. A composite filter element assembly, characterized in that: Comprising: A pre-treatment filter element (1) and a fine-treatment filter element (2), further comprising a central tube (3), wherein the fine-treatment filter element (2) is a spiral wound membrane wound around the central tube (3), the central tube (3) is made of a filter material that allows fluid to pass through, and the inner wall surface of the central tube (3) is a first concave curved surface, and the inner wall surface of the pre-treatment filter element (1) also forms a second concave curved surface; A first support skeleton is further provided on the inner circumference of the central tube (3), and the shape of the first support skeleton matches the shape of the inner wall surface of the central tube (3), and is also a concave curved surface structure; The pre-treatment filter element (1) comprises a first-stage pre-treatment filter element (11) and a second-stage pre-treatment filter element (12), the first-stage pre-treatment filter element (11) is a cylindrical structure, the second-stage pre-treatment filter element (12) is a cylindrical structure, the first-stage pre-treatment filter element (11) is disposed on the outer periphery in the radial direction of the second-stage pre-treatment filter element (12), and the inner wall surface of the second-stage pre-treatment filter element (12) forms the second concave curved surface; A first groove (31) is further provided on the inner wall surface of the central tube (3); and / or, a second groove (13) is further provided on the inner wall surface of the second-stage pre-treatment filter element (12); When the first groove (31) is included, the first groove (31) is multiple and evenly distributed on the inner wall surface of the central tube (3); when the second groove (13) is included, the second groove (13) is multiple and evenly distributed on the inner wall surface of the second-stage pre-treatment filter element (12); A second support skeleton is further provided on the inner circumference of the second-stage pre-treatment filter element (12), and the shape of the second support skeleton matches the shape of the inner wall surface of the second-stage pre-treatment filter element (12), and is also a concave curved surface structure; The filter material that allows fluid to pass through includes at least one of carbon material, polypropylene (PP) material, and ceramic material.

2. The composite filter element assembly according to claim 1, wherein: The fine-treatment filter element (2) is a reverse osmosis membrane.

3. The composite filter element assembly according to claim 2, wherein: The central tube (3) is a cylindrical carbon rod structure composed of the carbon material; or, the central tube (3) is a cylindrical PP structure composed of the polypropylene (PP) material; or, the central tube (3) is a structure of a cylindrical ceramic tube composed of the ceramic material.

4. The composite filter element assembly according to claim 1, wherein: The material of the first-stage pre-treatment filter element (11) is PP cotton, and the material of the second-stage pre-treatment filter element (12) is activated carbon.

5. The composite filter element assembly according to any one of claims 1-4, wherein: An ultrafiltration filter element (4) is further included and disposed on the inner periphery in the radial direction of the central tube (3), and the ultrafiltration filter element (4) is at least one.

6. A water purification system, characterized in that: Comprising the composite filter element assembly according to any one of claims 1-5.

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