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 bottle body (604) and a multi-stage filter element disposed inside the bottle body, including a pretreatment filter element, a fine filtration filter element (203), and a post-treatment filter element group; the post-treatment filter element group includes a central tube (602), and the central tube (602) is made of a filter material that allows fluid to pass through; the fluid is filtered in sequence through the pretreatment filter element, the fine filtration filter element, and the post-treatment filter element group, and a scale removal filter element (204) is further disposed between the pretreatment filter element and the fine filtration filter element (203) along the direction of fluid flow. By means of the present invention, the water to be treated is treated by a sintered carbon rod and then passes through the scale removal filter element before entering the reverse osmosis filter element; thereby greatly reducing the possibility of scale formation inside the composite filter element, effectively preventing blockage inside the composite filter element, and making the service life of the composite filter element longer.

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] In existing water purification devices, since water purification requires multiple steps of treatment, usually 3 or 4 - stage filter element assemblies are needed. External pipes are required to connect the water outlets and inlets between different filter element assemblies, making the internal pipes of the water purification device extremely complex, occupying a large space, and being inconvenient for installation and use. In existing composite filter elements, generally, multiple - stage filter element assemblies are integrated in a cylindrical shell to form a composite filter element, greatly reducing the space occupied by the water purifier and being convenient for installation and use.

[0003] However, in the composite filter element, due to its design principle of reducing space occupation, its internal structure is very compact. The concentrated water after being treated by the composite filter element is prone to scale formation in the narrow internal space. Without pre - treating the components in the water to be treated that are prone to scale formation in the previous pre - treatment, there are often too many scale - forming components in the subsequent concentrated water, forming scale inside the composite filter element, clogging the filter element, and affecting its service life.

[0004] The patent document "A Composite Filter Element Assembly and a Water Purification System" (Publication No. CN110255743A) discloses a composite filter element, including: a bottle body and a filter element with five or more stages arranged inside the bottle body; since it does not involve the pre - treatment of scale, there are too many scale - forming components in the concentrated water after being treated by the RO membrane, and the internal space of the composite filter element is narrow, making it easy to form scale inside and causing the composite filter element to be clogged.

[0005] Due to the relatively compact internal structure of the composite filter element of the water purifier in the prior art, when the concentrated water after RO membrane filtration flows in the narrow internal space of the composite filter element, it is prone to scale formation, leading to technical problems such as internal blockage of the composite filter element. Therefore, the present invention researches and designs a composite filter element assembly and a water purification system. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the composite filter element of the water purifier in the prior art has a relatively compact internal structure, and when the concentrated water after RO membrane filtration flows in the narrow internal space of the composite filter element, it is prone to scale formation, resulting in internal blockage of the composite filter element, so as to provide a composite filter element assembly and a water purification system.

[0007] The present invention provides a composite filter element assembly, which includes:

[0008] A bottle body and a multi-stage filter element disposed inside the bottle body, including a pretreatment filter element, a fine filtration filter element, and a post-treatment filter element group; the post-treatment filter element group includes a central tube made of a water-permeable filter material; the fluid is sequentially filtered through the pretreatment filter element, the fine filtration filter element, and the post-treatment filter element group, and a scale removal filter element is also disposed between the pretreatment filter element and the fine filtration filter element along the direction of fluid flow.

[0009] Preferably,

[0010] The scale removal filter element is in a cylindrical structure, and / or, the scale removal filter element is a structure made of a phosphate material.

[0011] Preferably,

[0012] A first baffle extending along the axial direction is disposed on the radial outer side of the scale removal filter element. The height of the first baffle extending axially upward is greater than or equal to the height of the scale removal filter element, and the height of the first baffle extending axially downward is lower than or equal to the height of the bottom position of the scale removal filter element.

[0013] Preferably,

[0014] The first baffle is a cylindrical structure extending along the axial direction of the scale removal filter element; and / or, a second baffle is further disposed at the bottom of the scale removal filter element, and the second baffle is connected to the first baffle.

[0015] Preferably,

[0016] The second baffle is integrally formed with the first baffle.

[0017] Preferably,

[0018] The multi-stage filter element is a filter element with five or more stages. The pretreatment filter element includes a first-stage pretreatment filter element and a second-stage pretreatment filter element. The post-treatment filter element group further includes a post-treatment filter element; the fluid is sequentially filtered through the first-stage pretreatment filter element, the second-stage pretreatment filter element, the fine filtration filter element, the central tube, and the post-treatment filter element; the scale removal filter element is disposed in a cavity on the radial inner side of the second-stage pretreatment filter element.

[0019] Preferably,

[0020] The first-stage pretreatment filter element and the second-stage pretreatment filter element are at the same height and are arranged inside and outside, and the first-stage pretreatment filter element is sleeved outside the second-stage pretreatment filter element; and / or, the fine filtration filter element is located below the first-stage pretreatment filter element or the second-stage pretreatment filter element, and the central tube is sleeved inside the fine filtration filter element, and the post-treatment filter element is sleeved inside the central tube.

[0021] Preferably,

[0022] A support sleeve with a cylindrical structure is further arranged on the radially inner side of the central tube, and at least one water passing hole is further arranged on the support sleeve; and / or,

[0023] The interior of the central tube has a sixth cavity, and the post-treatment filter element is arranged in the sixth cavity.

[0024] Preferably,

[0025] The material of the first-stage pre-treatment filter element is PP; and / or, the second-stage pre-treatment filter element is a sintered carbon rod; and / or, the fine filtration filter element is a spiral wound reverse osmosis filter element or a spiral wound nanofiltration filter element; and / or, 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 material of the post-treatment filter element is a microfiltration membrane and / or an ultrafiltration membrane; and / or, the post-treatment filter element is installed upside down.

[0026] Preferably,

[0027] An inlet is arranged at the bottom or top of the bottle body, and a pure water outlet and a concentrated water outlet are further arranged on the bottle body at a position on the same side as the inlet; the pure water outlet is arranged at the bottom end of the bottle body, and the lower end of the post-treatment filter element is communicated with the pure water outlet; and / or, the concentrated water outlet is arranged at the bottom end of the bottle body, and the lower end of the fine filtration filter element can be communicated with the concentrated water outlet.

[0028] The present invention further provides a water purification system, which includes the composite filter element assembly described in any one of the preceding items.

[0029] The composite filter element assembly and the water purification system provided by the present invention have the following beneficial effects:

[0030] 1. By arranging multiple-stage filter elements inside the bottle body and arranging a scale removal filter element between the pre-treatment filter element and the fine filtration filter element, and arranging the scale removal filter element inside the sintered carbon rod, the water to be treated passes through the sintered carbon rod and then passes through the scale removal filter element before entering the reverse osmosis filter element; thus, the possibility of scale formation in the concentrated water inside the composite filter element is greatly reduced, effectively preventing blockage inside the composite filter element and making the service life of the composite filter element longer;

[0031] 2. By setting a descaling filter element inside the composite filter element, the water to be treated first flows through the first-stage pretreatment filter element and the second-stage pretreatment filter element, then enters the descaling filter element from the top, then passes through the bottom of the descaling filter element into the fine filtration filter element, and then through the carbon rod central tube and the post-ultrafiltration treatment. The pure water flows out from the middle outlet at the bottom of the composite filter element, and the concentrated water flows out from the left outlet at the bottom of the composite filter element; if the descaling filter element is set after the ultrafiltration treatment, a certain pressure is required to discharge the concentrated water after ultrafiltration. The subsequent concentrated water outlet holes are made relatively small to increase the pressure to discharge the concentrated water, but this is prone to blockage. However, in the present invention, by setting the descaling filter element in front of the ultrafiltration (even in front of the RO membrane), substances prone to scaling in the concentrated water can be reduced, effectively preventing the outlet holes from being blocked, and also slowing down the flow rate of the concentrated water.

[0032] 3. And in the present invention, by setting a first baffle outside the descaling filter element, by setting the baffle, after the water to be treated comes out through the sintered carbon rod, it enters the descaling filter element from the top of the descaling filter element. Under the action of gravity, the water to be treated fully flows through the inside of the descaling filter element, enabling the water to be treated to come into full contact with the descaling filter element, improving the utilization of the descaling filter element, and enhancing the water purification effect of the composite filter element.

[0033] 4. For the filter elements with five or more levels in the present invention, along the flow direction of the fluid, the fluid sequentially passes through the first-stage pretreatment filter element, the second-stage pretreatment filter element, the fine filtration filter element, the central tube, and the post-treatment filter element and is filtered. The integrated composite filter element, which includes five-level filter elements, can be used alone on a water purifier to play a purification function. Compared with the existing single-level filter elements or two-level, three-level, or even four-level filter elements, a five-level filtration effect can be achieved in one bottle body, which can effectively improve the filtration effect while making the filter element assembly and even the volume of the water purifier smaller. The filter element integrates five-level filtration functions. When designed, the service lives of the various filter elements are matched, and the volume is considered, so it will not cause a large volume, but only be smaller than the volume when using individual filter elements; all water inlets, pure water outlets, concentrated water outlets, etc. are set to be arranged at one end of the bottle body, which can effectively avoid the problem of large space occupation ratio caused by the distribution at both ends of the interface;

[0034] 5. And by setting the filter elements in one bottle body, effectively integrating five-level filtration functions, and matching the service lives of the various filter elements during design. Compared with the problem that the service lives of the bottle bodies of single-level filter elements or two-level, three-level, or even four-level filter elements are mismatched, resulting in inconsistent filter element replacement cycles and frequent filter element replacement problems, when replacing the internal filter elements, the service lives of the filter elements inside the bottle body are basically the same. Therefore, the filter element replacement cycles are consistent, and the filter elements are replaced integrally, effectively avoiding the problem of frequent filter element replacement caused by inconsistent filter element replacement cycles when using each filter element alone. Description of the Drawings

[0035] Figure 1It is a schematic diagram of the three-dimensional internal structure of the composite filter element assembly of the present invention;

[0036] Figure 2 is Figure 1 a schematic diagram of the internal water flow direction structure of the composite filter element assembly in

[0037] In the figure, the reference numerals are represented as:

[0038] 10. Composite filter element; 201. First-stage pretreatment filter element; 202. Second-stage pretreatment filter element; 203. Fine filtration filter element; 204. Scale removal filter element; 204a. First baffle; 204b. Second baffle; 205. Post-treatment filter element; 504. Fourth cavity; 506. Sixth cavity; 602. Central tube; 604. Bottle body; 701. Water inlet; 702. Concentrate outlet; 703. Pure water outlet; 202b. Support sleeve; 202a. Water passing hole. Detailed implementation manners

[0039] As Figure 1-2 shown, the present invention provides a composite filter element assembly, which is characterized in that it includes:

[0040] A bottle body 604 and a multi-stage filter element arranged inside the bottle body, including a pretreatment filter element, a fine filtration filter element 203, and a post-treatment filter element group; the post-treatment filter element group includes a central tube 602, and the central tube 602 is made of a filter material that allows fluid to pass through; the fluid is sequentially filtered through the pretreatment filter element, the fine filtration filter element, and the post-treatment filter element group, and a scale removal filter element 204 is also arranged between the pretreatment filter element and the fine filtration filter element 203 along the direction of fluid flow.

[0041] In the present invention, by arranging a multi-stage filter element inside the bottle body and a scale removal filter element between the pretreatment filter element and the fine filtration filter element, and by arranging the scale removal filter element before the RO membrane and inside the sintered carbon rod, the water to be treated is first treated by the scale removal filter element before entering the reverse osmosis filter element after passing through the sintered carbon rod treatment; thus, the possibility of scale formation in the composite filter element is greatly reduced, effectively preventing blockage inside the composite filter element and making the service life of the composite filter element longer; if the scale removal filter element is arranged after the ultrafiltration treatment, a certain pressure is required for the concentrate after ultrafiltration to be discharged, and the subsequent concentrate outlet holes are made relatively small, so as to increase the pressure to discharge the concentrate, but this is prone to blockage. However, in the present invention, by arranging the scale removal filter element in front of the ultrafiltration (even in front of the RO membrane), substances prone to scale formation in the concentrate can be reduced, effectively preventing blockage of the outlet holes, and also slowing down the flow rate of the concentrate.

[0042] Preferably,

[0043] The descaling filter element 204 is in a cylindrical structure, and / or, the descaling filter element 204 is a structure made of phosphate material. This is the preferred structural form and its preferred material of the descaling filter element of the present invention, which can effectively remove dirt such as water scale. Raw water enters the interior of the housing from the water inlet and flows upward along the inner side wall of the housing. It first flows through the folded paper pp, the sintered carbon rod, and the descaling filter element in sequence. The folded paper pp first removes large particles such as sediment and suspended matter, and then the sintered carbon rod absorbs the residual chlorine in the raw water. After the raw water enters the descaling filter element, the descaling filter element absorbs most of the easily scale-forming components. Then, under the action of gravity, the water flows into the spiral wound reverse osmosis filter element. After desalination treatment by the reverse osmosis filter element, the concentrated water flows out from the second water outlet. The water to be further treated flows into the carbon rod central tube and the filamentary ultrafiltration membrane in sequence. After treatment, the pure water flows out from the first water outlet to obtain pure water.

[0044] Preferably,

[0045] A first baffle 204a extending along its axis is provided on the radially outer side of the descaling filter element 204. The height of the first baffle 204a extending axially upward is greater than or equal to the height of the descaling filter element 204, and the height of the first baffle 204a extending axially downward is lower than or equal to the height of the bottom position of the descaling filter element 204. By providing a first baffle on the outer periphery of the descaling filter element, after the water to be treated passes through the sintered carbon rod and comes out, it enters the descaling filter element from the top of the descaling filter element. Under the action of gravity, the water to be treated fully flows through the interior of the descaling filter element, enabling the water to be treated to be in full contact with the descaling filter element, improving the utilization of the descaling filter element, and improving the water purification effect of the composite filter element;

[0046] When a general cylindrical composite filter element is in use, the water to be treated generally seeps into the interior of the composite filter element from the upper side wall of the composite filter element and then flows out from the bottom of the composite filter element; when the water to be treated seeps into the composite filter element from the side wall of the composite filter element, due to the action of gravity, part of the water to be treated directly enters the interior of the composite filter element from the bottom of the descaling filter element and does not fully flow through the entire descaling filter element, and the descaling filter element is not fully utilized.

[0047] In the present invention, a baffle is provided around the bottom of the descaling filter element. When the water to be treated flows through the descaling filter element, under the action of the baffle, the water to be treated can only enter the descaling filter element from the top of the descaling filter element. Under the action of gravity, the water to be treated flows out from the bottom of the descaling filter element from top to bottom and enters the next water purification step, effectively increasing the contact area of the water flow with the descaling filter element in full contact and improving the descaling efficiency.

[0048] Preferably,

[0049] The first baffle 204a is a cylindrical structure extending along the axial direction of the scale removal filter element 204; and / or, a second baffle 204b is further provided at the bottom of the scale removal filter element 204, and the second baffle 204b is connected to the first baffle 204a. This is a preferred structural form of the first baffle of the present invention, and the second baffle can also play a role in sealing the bottom of the scale removal filter element, so as to form a structure with only upward water inlet for the scale removal filter element when connected to the first baffle, thereby increasing the contact area between water and the scale removal filter element. The outlet of the scale removal filter element is at the central position below it, improving the scale removal effect.

[0050] Preferably,

[0051] The second baffle 204b and the first baffle 204a are integrally formed. This is a further preferred structural form of the present invention, which can make the processing of the two more convenient and further improve the sealing performance.

[0052] Preferably,

[0053] The multi-stage filter element is a filter element with five or more stages. The pretreatment filter element includes a first-stage pretreatment filter element 201 and a second-stage pretreatment filter element 202. The post-treatment filter element group includes a central tube 602 and a post-treatment filter element 205. The central tube 602 is made of a filter material that allows fluid to pass through; the fluid is filtered in turn through the first-stage pretreatment filter element 201, the second-stage pretreatment filter element 202, the fine filtration filter element 203, the central tube 602, and the post-treatment filter element 205; the scale removal filter element 204 is arranged in a fourth cavity 504 on the radial inner side of the second-stage pretreatment filter element 202.

[0054] For the filter element with five or more stages of the present invention, along the flow direction of the fluid, the fluid is filtered in turn through the first-stage pretreatment filter element, the second-stage pretreatment filter element, the fine filtration filter element, the central tube, and the post-treatment filter element. It is an integrated composite filter element, which includes five-stage filter elements and can be used alone on a water purifier to play a purification function. Compared with the existing single-stage filter element or two-stage, three-stage or even four-stage filter elements, a five-stage filtration effect can be achieved in one bottle body, which can effectively improve the filtration effect while making the filter element assembly and even the volume of the water purifier smaller. The filter element integrates five-stage filtration functions, and the service life of each filter element is matched during design, and the volume is considered, so it will not cause a large volume, but only smaller than that of a single filter element; all water inlets, pure water outlets, and concentrated water outlets are arranged at one end of the bottle body, which can effectively avoid the problem of large space occupation ratio caused by the distribution at both ends of the interface;

[0055] Moreover, by setting a filter element in a bottle body, five-stage filtration functions are effectively integrated into one. When designing, the service lives of the respective filter elements are matched. Compared with the problem that the service lives of single-stage filter elements or the bottle bodies of two-stage, three-stage, or even four-stage filter elements do not match, resulting in inconsistent filter element replacement cycles and frequent filter element replacement, when replacing the internal filter element, the service lives of the filter elements inside the bottle body are basically the same. Therefore, the filter element replacement cycles are consistent, and the filter elements are replaced integrally, effectively avoiding the problem of frequent filter element replacement caused by inconsistent filter element replacement cycles when each filter element is used alone.

[0056] Preferably,

[0057] The first-stage pretreatment filter element 201 and the second-stage pretreatment filter element 202 are located at the same height and are arranged inside and outside, and the first-stage pretreatment filter element 201 is sleeved outside the second-stage pretreatment filter element 202; and / or,

[0058] The fine filtration filter element 203 is located below the first-stage pretreatment filter element 201 or the second-stage pretreatment filter element 202, and both the central tube 602 and the post-treatment filter element 205 are sleeved inside the fine filtration filter element 203, and the post-treatment filter element 205 is sleeved inside the central tube 602.

[0059] In this way, the water flow is purified by the first-stage pretreatment filter element outside and then enters the second-stage pretreatment filter element inside for treatment, realizing the function of pretreatment or rough filtration before fine filtration. The layout form of the filter element structure is as follows: the first-stage pretreatment filter element 201 wraps or nests on the outer surface of the second-stage pretreatment filter element 202, forming an internal and external structure layout; the latter three filter elements and the first two-stage pretreatment filter elements are in an up-and-down structure layout; the two-stage post-treatment filter elements of the central tube 602 and the post-treatment filter element 205 are filled inside the central tube of the fine filtration filter element 203; such a structure layout can effectively eliminate the inner cylinder structure adopted in the prior art, fix the above two-stage pretreatment filter elements through multiple connecting end caps, and realize the fixing functions of the fine filtration filter element and the two-stage post-treatment filter elements (including ultrafiltration) through the arrangement of multiple connecting end caps and the central tube, effectively reducing the volume and realizing the miniaturization of the volume.

[0060] Preferably,

[0061] A cylindrical support sleeve 202b is further arranged on the radially inner side of the central tube 602, and at least one water passing hole 202a is arranged on the support sleeve 202b; and / or,

[0062] The central tube 602 has a sixth cavity 506 inside, and the post-treatment filter element 205 is arranged in the sixth cavity 506.

[0063] 9. The composite filter element assembly according to claim 6, wherein:

[0064] The material of the first-stage pretreatment filter element 201 is PP; and / or, the second-stage pretreatment filter element 202 is a sintered carbon rod; and / or, the fine filtration filter element 203 is a spiral wound reverse osmosis filter element or a spiral wound nanofiltration filter element; and / or, the water-permeable filter material includes at least one of carbon material, polypropylene (PP) material, and ceramic material; and / or, the material of the post-treatment filter element 205 is a microfiltration membrane and / or an ultrafiltration membrane (the post-treatment filter element includes a mounting seat and hollow fiber membrane filaments, the mounting seat is located at the lower end, the hollow fiber membrane filaments are located at the upper end, the lower end thereof is connected to the mounting seat and extends upwardly); and / or, the post-treatment filter element 205 is installed in an inverted manner; and / or, a post-activated carbon 206 is further provided downstream of the post-treatment filter element 205 along the fluid flow direction.

[0065] Among them, the first-stage pretreatment filter element 201 can be a meltblown PP cotton or a pleated PP cotton, and its main function is to perform the first-stage filtration to remove large suspended solids, sediment, rust and other pollutants in the water body; the second-stage pretreatment filter element 202 can be a sintered carbon rod, and its main function is to adsorb and remove residual chlorine, small molecular organic substances, etc. in the water body; the fine filtration filter element 203 can be a spiral wound reverse osmosis filter element or a spiral wound nanofiltration filter element, and its function is fine filtration, which can remove heavy metal ions, small molecular organic substances, etc. in the water body to achieve deep purification of the water body; by preferably selecting the filter material of the central tube as at least one of carbon material, polypropylene (PP) material, and ceramic material, it is possible to allow water to pass through and perform filtration. Further, by providing a support sleeve radially inside the inner wall of the central tube, it is possible to support the material having a filtering function (because of its filtering function, its structural strength is usually insufficient to support or the support strength is not high enough), thereby improving the firm fixing of the central tube and providing conditions for realizing a long-term filtering effect; the post-treatment filter element 205 can be a microfiltration membrane, an ultrafiltration membrane, etc., and its function is to prevent the microbial content in the effluent from exceeding the standard and ensure the hygienic safety of the water used.

[0066] Preferably,

[0067] The bottom or top of the bottle body 604 is provided with a water inlet 701, and a pure water outlet 703 and a concentrated water outlet 702 are also provided on the bottle body 604 at a position on the same side as the water inlet; the pure water outlet 703 is arranged at the bottom end of the bottle body 604, and the lower end of the post-treatment filter element 205 is communicated with the pure water outlet 703; and / or, the concentrated water outlet 702 is arranged at the bottom end of the bottle body 604, and the lower end of the fine filtration filter element 203 can be communicated with the concentrated water outlet 702. The water after passing through the fine filtration filter element then flows out through the central tube and the post-treatment filter element, and is discharged from the bottom end to obtain pure water. The water filtered by the fine filtration filter element and not passing through the last two-stage filtration filter elements is discharged through the ninth cavity 509 and the concentrated water outlet to obtain concentrated water (with a high salt content and not drinkable).

[0068] The present invention also provides a water purification system, which includes the composite filter element assembly described in any one of the previous items.

[0069] The present invention lies in that: by arranging a descaling filter element inside the composite filter element, the water to be treated first flows through the first-stage pre-treatment filter element and the second-stage pre-treatment filter element, then flows into the descaling filter element from the top, then enters the fine filtration filter element through the bottom of the descaling filter element, and then passes through the carbon rod central tube and the post-ultrafiltration treatment. The pure water flows out from the middle outlet at the bottom of the composite filter element, and the concentrated water flows out from the left outlet at the bottom of the composite filter element;

[0070] The composite filter element is composed of 6 kinds of treatment filter elements, including a descaling filter element, folded paper pp, a sintered carbon rod, a spiral wound reverse osmosis filter element, a carbon rod central tube and a filamentous ultrafiltration membrane; these 6 kinds of treatment filter elements are combined together, so that the sintered carbon rod is arranged around the outside of the descaling filter element, and the folded paper pp is coated on the outside of the sintered carbon rod. The descaling filter element, the sintered carbon rod and the folded paper pp are arranged at the upper end inside the composite filter element;

[0071] A baffle is arranged around the bottom of the descaling filter element. When the water to be treated flows through the descaling filter element, under the action of the baffle, the water to be treated can only enter the descaling filter element from the top of the descaling filter element, and the water to be treated flows out from the bottom of the descaling filter element from top to bottom under the action of gravity and enters the next step of water purification.

[0072] Since the internal structure of the composite filter element is relatively compact, when the concentrated water after passing through the RO membrane flows in the narrow internal part of the composite filter element, it is easy to scale and cause blockage inside the composite filter element. By arranging a descaling filter element before the RO membrane and arranging the descaling filter element inside the sintered carbon rod, the water to be treated is first treated by the descaling filter element after passing through the sintered carbon rod and before entering the reverse osmosis filter element; thus, the possibility of scaling of the concentrated water inside the composite filter element is greatly reduced, and the service life of the composite filter element is longer;

[0073] By setting a baffle plate, after the water to be treated comes out through the sintered carbon rod, it enters the descaling filter element from the top of the descaling filter element. Under the action of gravity, the water to be treated fully flows through the inside of the descaling filter element, enabling the water to be treated to come into full contact with the descaling filter element, improving the utilization of the descaling filter element, and enhancing the water purification effect of the composite filter element.

[0074] A sealing baffle plate is provided on the side wall of the descaling filter element, and a water inlet is provided at the top of the sealing baffle plate. The composite filter element further includes a housing, folded paper PP, a sintered carbon rod, a spiral wound reverse osmosis filter element, a carbon rod central tube, and a filamentary ultrafiltration membrane; the sintered carbon rod is disposed around the outside of the descaling filter element, and the folded paper PP is disposed outside the sintered carbon rod. The descaling filter element, the sintered carbon rod, and the folded paper PP are disposed at the top end inside the housing. The spiral wound reverse osmosis filter element, the carbon rod central tube, and the filamentary ultrafiltration membrane are disposed inside the housing, below the descaling filter element. The carbon rod central tube is disposed around the outside of the filamentary ultrafiltration membrane, and the spiral wound reverse osmosis filter element is rotatably disposed around the outside of the carbon rod central tube; a first water outlet, a second water outlet, and a water inlet are provided at the bottom of the housing.

[0075] Raw water enters the inside of the housing from the water inlet and flows upward along the inner side wall of the housing. First, it sequentially flows through the folded paper PP, the sintered carbon rod, and the descaling filter element. The folded paper PP first removes large particles such as sediment and suspended matter, and then the sintered carbon rod absorbs the residual chlorine in the raw water. After the raw water enters the descaling filter element, the descaling filter element absorbs most of the easily scale-forming components. Then, under the action of gravity, the water flows into the spiral wound reverse osmosis filter element. After desalination treatment by the reverse osmosis filter element, the concentrated water flows out from the second water outlet, and the water to be further treated sequentially flows into the carbon rod central tube and the filamentary ultrafiltration membrane. After treatment, the pure water flows out from the first water outlet to obtain pure water.

[0076] Before the water to be treated enters the reverse osmosis filter element after being treated by the sintered carbon rod, it is first treated by the descaling filter element; thus, the possibility of scale formation of the concentrated water inside the composite filter element is greatly reduced, and the service life of the composite filter element is longer.

[0077] By setting a sealing baffle plate, after the water to be treated comes out through the sintered carbon rod, it enters the descaling filter element from the top of the descaling filter element. Under the action of gravity, the water to be treated fully flows through the inside of the descaling filter element, enabling the water to be treated to come into full contact with the descaling filter element, improving the utilization of the descaling filter element, and enhancing the water purification effect of the composite filter element.

[0078] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should 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 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 bottle body (604) and a multi-stage filter element disposed inside the bottle body, including a pretreatment filter element, a fine filtration filter element (203), and a post-treatment filter element group; the post-treatment filter element group includes a central tube (602), and the central tube (602) is made of a filter material that allows fluid to pass through; the fluid is filtered successively through the pretreatment filter element, the fine filtration filter element, and the post-treatment filter element group, and a scale removal filter element (204) is further disposed between the pretreatment filter element and the fine filtration filter element (203) along the direction of fluid flow; A first baffle (204a) extending axially along the radial outer side of the scale removal filter element (204) is provided, and the height of the first baffle (204a) extending axially upward is greater than or equal to the height of the scale removal filter element (204), and the height of the first baffle (204a) extending axially downward is lower than or equal to the height of the bottom position of the scale removal filter element (204); The first baffle (204a) is a cylindrical structure extending along the axial direction of the scale removal filter element (204); a second baffle (204b) is further provided at the bottom of the scale removal filter element (204), and the second baffle (204b) is connected to the first baffle (204a); under the action of the baffle, the water to be treated can only enter the scale removal filter element from the top of the scale removal filter element, and the water to be treated flows out from the bottom of the scale removal filter element from top to bottom under the action of gravity and enters the next step of water purification; A cylindrical support sleeve (202b) is further provided on the radial inner side of the central tube (602), and at least one water passing hole (202a) is provided on the support sleeve (202b); The multi-stage filter element is a filter element with five or more stages, the pretreatment filter element includes a first-stage pretreatment filter element (201) and a second-stage pretreatment filter element (202), and the post-treatment filter element group further includes a post-treatment filter element (205); the fluid is filtered successively through the first-stage pretreatment filter element (201), the second-stage pretreatment filter element (202), the fine filtration filter element (203), the central tube (602), and the post-treatment filter element (205); the scale removal filter element (204) is disposed in a fourth cavity (504) on the radial inner side of the second-stage pretreatment filter element (202); The first-stage pretreatment filter element (201) and the second-stage pretreatment filter element (202) are located at the same height and are arranged inside and outside, and the first-stage pretreatment filter element (201) is sleeved outside the second-stage pretreatment filter element (202); The fine filtration filter element (203) is located below the first-stage pretreatment filter element (201) or the second-stage pretreatment filter element (202), and both the central tube (602) and the post-treatment filter element (205) are sleeved inside the fine filtration filter element (203), and the post-treatment filter element (205) is sleeved inside the central tube (602); 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 descaling filter element (204) is of a cylindrical structure, and / or the descaling filter element (204) is a structure made of a phosphate material.

3. The composite filter element assembly according to claim 1, wherein: The second baffle (204b) is integrally formed with the first baffle (204a).

4. The composite filter element assembly according to claim 1, wherein: The interior of the central tube (602) has a sixth cavity (506), and the post-treatment filter element (205) is disposed in the sixth cavity (506).

5. The composite filter element assembly according to claim 1, wherein: The material of the first-stage pre-treatment filter element (201) is PP; and / or the second-stage pre-treatment filter element (202) is a sintered carbon rod; and / or the fine filtration filter element (203) is a spiral wound reverse osmosis filter element or a spiral wound nanofiltration filter element; and / or the material of the post-treatment filter element (205) is a microfiltration membrane and / or an ultrafiltration membrane; and / or the post-treatment filter element (205) is installed upside down; and / or a post-activated carbon (206) is further disposed downstream of the post-treatment filter element (205) along the fluid flow direction.

6. The composite filter element assembly according to claim 1, wherein: The bottom of the bottle body (604) is provided with a water inlet (701), and a pure water outlet (703) and a concentrated water outlet (702) are further provided on the bottle body (604) at a position on the same side as the water inlet; the pure water outlet (703) is provided at the bottom end of the bottle body (604), and the lower end of the post-treatment filter element (205) is communicated with the pure water outlet (703); and / or the concentrated water outlet (702) is provided at the bottom end of the bottle body (604), and the lower end of the fine filtration filter element (203) can be communicated with the concentrated water outlet (702).

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

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