Front filter element and water purification equipment with front filter element
By designing a combination of central rod, membrane structure, and water-proof structure, the problems of small filtration area and low dirt holding capacity of PP cotton pre-filter cartridges are solved, achieving a filter cartridge effect with larger filtration area, higher flow rate, and longer life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-03-31
AI Technical Summary
Existing PP cotton pre-filters have limited filtration area, small dirt holding capacity and throughput, and short lifespan.
A pre-filter cartridge is designed, including a central rod, a coaxial membrane structure, and a water-proof structure covering the outer periphery of the membrane structure. The membrane structure consists of multiple stacked membrane bags, each membrane bag consisting of two stacked rectangular membrane sheets. The membrane bags are formed by winding with the first side parallel to the central rod, increasing the filtration area and dirt holding capacity, and optimizing the water flow path through the water guiding structure to improve the flux.
It significantly increases the filtration area and dirt holding capacity, reduces the rate at which impurities accumulate on the filter surface, extends the service life of the filter element, and improves the smoothness and flow rate of water.
Smart Images
Figure CN224057108U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to filter core technical field, specifically provide a front filter core and have the water purification equipment of this front filter core. BACKGROUND
[0002] In recent years, people's living standards are improving, people pay more and more attention to drinking water health, and water purifiers gradually become more and more common household appliances.
[0003] In the water purification equipment using reverse osmosis filter core, the upstream pipeline of the reverse osmosis filter core is usually provided with a front filter core, and tap water is filtered through the front filter core first and then through the reverse osmosis filter core. The front filter core is usually a PP cotton filter core, which is used to remove suspended solids, large particles, rust and the like in water. However, the filtering surface of the PP cotton filter core is only the outer circumferential surface of the PP cotton structure, and the trapped pollutants accumulate on the outer circumferential surface of the PP cotton. The filtering area of the PP cotton filter core is limited, the pollutant carrying capacity and flux are small, and the service life is short.
[0004] Therefore, there is a need in the art for a new technical solution to solve the above problems. UTILITY MODEL CONTENT
[0005] The utility model aims at solving the above technical problems, i.e. solving the problems of limited filtering area, small pollutant carrying capacity and flux, and short service life of the existing PP cotton front filter core.
[0006] In a first aspect, the utility model provides a front filter core, which comprises a center rod, a membrane structure formed on the outer circumferential surface of the center rod and coaxial with the center rod, and a water isolation structure wrapped on the outer circumferential surface of the membrane structure; the membrane structure comprises a plurality of membrane bags stacked; each membrane bag comprises two stacked rectangular membrane sheets, the first side edge, the second side edge and the third side edge of the two rectangular membrane sheets in each membrane bag are connected to form the first side edge, the second side edge and the third side edge of the membrane bag, respectively, and the first opening at the fourth side edge of the membrane bag is formed between the fourth side edges of the two rectangular membrane sheets in each membrane bag; the first side edge, the third side edge and the fourth side edge of adjacent two membrane bags are connected, respectively, and the second opening is formed between the second side edges of adjacent two membrane bags, and the second side edge is opposite to the fourth side edge of the membrane bag; the plurality of membrane bags are wound on the center rod with the first side edge of the membrane bag parallel to the center rod to form the membrane structure; the first opening and the second opening are used as one and the other of the water inlet and the water outlet, respectively.
[0007] In the preferred technical scheme of the pre-filter cartridge, the pre-filter cartridge further comprises a first end cover installed at the first end of the membrane structure, a first water passage hole is formed on the first end cover, the water isolation structure is sealingly connected to the edge portion of the first end cover at the portion of the first end of the membrane structure, and the opening of the first opening and the second opening at the first end of the membrane structure is in communication with the first water passage hole.
[0008] In the preferred technical scheme of the pre-filter cartridge, the pre-filter cartridge further comprises a second end cover installed at the second end of the membrane structure, a second water passage hole is formed on the second end cover, the water isolation structure is sealingly connected to the edge portion of the second end cover at the portion of the second end of the membrane structure, and the opening of the first opening and the second opening at the second end of the membrane structure is in communication with the second water passage hole.
[0009] In the preferred technical scheme of the pre-filter cartridge, the pre-filter cartridge further comprises an outer shell, a water flow channel is formed between the outer shell and the water isolation structure, the outer shell is provided with a first water passage plug-in connector and a second water passage plug-in connector at the end portion close to the first end of the membrane structure, the first water passage plug-in connector is in communication with the first water passage hole, and the second water passage plug-in connector is in communication with the opening of the first opening and the second opening at the second end of the membrane structure through the water flow channel.
[0010] In the preferred technical scheme of the pre-filter cartridge, the water isolation structure is a flexible film wrapped on the outer circumferential surface of the membrane structure; and / or the central rod is a central pipe, at least one cross section of the central pipe perpendicular to the axial direction is blocked.
[0011] In the preferred technical scheme of the pre-filter cartridge, all the rectangular membrane sheets in the plurality of membrane bags are formed by folding one membrane sheet.
[0012] In the preferred technical scheme of the pre-filter cartridge, a first water guide structure is arranged between the two rectangular membrane sheets of each membrane bag; and / or a second water guide structure is arranged between adjacent membrane bags.
[0013] In the preferred technical scheme of the pre-filter cartridge, the first water guide structure is a water guide cloth or a grid; and / or the second water guide structure is a water guide cloth or a grid; and / or the thickness of the water guide structure in the first water guide structure and the second water guide structure for guiding raw water is greater than the thickness of the water guide structure for guiding clean water.
[0014] In the preferred technical scheme of the pre-filter cartridge, the material of the rectangular membrane sheet is non-woven fabric, microfiltration membrane, ultrafiltration membrane or nanofiltration membrane.
[0015] In the technical scheme, the pre-filter cartridge comprises a center rod, a membrane structure formed on the outer circumferential surface of the center rod and coaxial with the center rod, and a water-proof structure wrapped on the outer circumferential surface of the membrane structure; the membrane structure comprises a plurality of membrane bags stacked; each membrane bag comprises two rectangular membrane sheets stacked; the first side edge, the second side edge and the third side edge of the two rectangular membrane sheets in each membrane bag are connected to form the first side edge, the second side edge and the third side edge of the membrane bag respectively; the first opening at the fourth side edge of the membrane bag is formed between the fourth side edges of the two rectangular membrane sheets in each membrane bag; the first side edge, the third side edge and the fourth side edge of adjacent two membrane bags are connected respectively, the second opening is formed between the second side edges of the adjacent two membrane bags, and the second side edge of the membrane bag is opposite to the fourth side edge; the plurality of membrane bags are wound on the center rod with the first side edge of the membrane bag parallel to the center rod to form the membrane structure; and the first opening and the second opening are used as one and the other of the water inlet and the water outlet respectively.
[0016] In use of the pre-filter cartridge, one of the first opening and the second opening is used as the water inlet, and the other is used as the water outlet; water flows into the water inlet, is filtered by the membrane sheets of the membrane structure and then flows out of the water outlet. When the first opening and the second opening are used as the water inlet and the water outlet respectively, water flows into the membrane bag from the first opening, then passes through the membrane sheets and flows into the space between the adjacent two membrane bags, and the impurities in the water are intercepted in the membrane bag; the water (i.e. filtered water) flowing into the space between the adjacent two membrane bags flows out of the second opening. When the first opening and the second opening are used as the water outlet and the water inlet respectively, water flows into the adjacent membrane bag from the second opening, then passes through the membrane sheets and flows into the membrane bag, and the impurities in the water are intercepted between the adjacent membrane bags; the water (i.e. filtered water) flowing into the membrane bag flows out of the first opening. Since the membrane structure comprises a plurality of membrane bags stacked, each membrane bag comprises two rectangular membrane sheets stacked, the surfaces of the two rectangular membrane sheets of the membrane bag form the filtering surfaces, and the plurality of membrane bags are stacked and wound on the center rod to form the membrane structure, the filtering area of the membrane structure is much larger than the outer circumferential surface of the membrane structure, so that the filtering area, the impurity capacity and the flux of the pre-filter cartridge are greatly increased, the increasing speed of the impurity thickness on the filtering surface is reduced, and the service life of the pre-filter cartridge is prolonged. The plurality of membrane bags are wound on the center rod with the first side edge of the membrane bag parallel to the center rod to form the membrane structure, the first opening and the second opening are located at the first end and the second end of the membrane structure respectively, and the water flow flows along the axial direction of the membrane structure. Compared with the water flow flowing along a non-linear route, the water flow has relatively small resistance and high smoothness, so that the pre-filter cartridge has a large flux.
[0017] Preferably, the pre-filter cartridge further comprises a first end cover mounted at the first end of the membrane structure, a first water passage hole is formed in the first end cover, the part of the water-proof structure located at the first end of the membrane structure is sealingly connected with the edge part of the first end cover, and the openings of the first opening and the second opening located at the first end of the membrane structure are in communication with the first water passage hole.
[0018] Through the arrangement, the connection of the external waterway with the first opening and the opening of the second opening located at the first end of the membrane structure is facilitated, and the first end of the membrane structure is protected, thereby reducing the risk of damage of the first end of the membrane structure due to collision during installation.
[0019] Preferably, the pre-filter element further comprises a second end cover installed at the second end of the membrane structure, a second water passage hole is formed on the second end cover, and the part of the water isolation structure located at the second end of the membrane structure is sealingly connected with the edge part of the second end cover, the first opening and the opening of the second opening located at the second end of the membrane structure are in communication with the second water passage hole.
[0020] Through the arrangement, the connection of the external waterway with the first opening and the opening of the second opening located at the first end of the membrane structure is facilitated, and the first end of the membrane structure is protected, thereby reducing the risk of damage of the first end of the membrane structure due to collision during installation.
[0021] Preferably, the pre-filter element further comprises a housing, a water flow channel is formed between the housing and the water isolation structure, the end of the housing close to the first end of the membrane structure is provided with a first water passage plug-in connector and a second water passage plug-in connector, the first water passage plug-in connector is in communication with the first water passage hole, and the second water passage plug-in connector is in communication with the first opening and the opening of the second opening located at the second end of the membrane structure through the water flow channel.
[0022] Through the arrangement, when the pre-filter element is installed into the installation position of the water purification device, the end of the housing with the first water passage plug-in connector and the second water passage plug-in connector is inserted into the installation position, and the connection of the waterway of the pre-filter element with the waterway of the water purification device can be quickly realized, thereby facilitating the installation of the pre-filter element.
[0023] Preferably, the water isolation structure is a flexible film wrapped on the outer circumferential surface of the membrane structure, and / or the central rod is a central pipe, at least one cross section of the central pipe perpendicular to the axial direction is blocked.
[0024] The water isolation structure is a flexible film wrapped on the outer circumferential surface of the membrane structure, which can reduce the material cost of the water isolation structure, thereby reducing the manufacturing cost of the pre-filter element. The central rod is a central pipe, at least one cross section of the central pipe perpendicular to the axial direction is blocked, which can reduce the weight of the central rod, thereby reducing the weight of the pre-filter element, facilitating the taking, placing and disassembling of the pre-filter element.
[0025] Preferably, all the rectangular membrane sheets in the plurality of membrane bags are formed by folding one membrane sheet.
[0026] Through the arrangement, the connecting process of the side edges of the rectangular membrane sheet can be reduced, and the manufacturing efficiency of the pre-filter element is improved.
[0027] Preferably, a first water guiding structure is arranged between the two rectangular membrane sheets of each membrane bag; and / or a second water guiding structure is arranged between adjacent membrane bags.
[0028] Through such an arrangement, the gap between the rectangular membrane sheets is increased, which can avoid the rectangular membrane sheets from being attached to each other to increase the resistance of water flow, thereby improving the smoothness of water flow, and the rectangular membrane sheets can also accommodate more impurities, thereby increasing the flux and impurity capacity of the pre-filter cartridge and further prolonging the service life of the pre-filter cartridge.
[0029] Preferably, the thickness of the water guiding structure for guiding raw water in the first water guiding structure and the second water guiding structure is greater than the thickness of the water guiding structure for guiding clean water.
[0030] Through such an arrangement, the membrane structure can accommodate more impurities, thereby increasing the flux and impurity capacity of the pre-filter cartridge and further prolonging the service life of the pre-filter cartridge.
[0031] In a second aspect, the utility model also provides a water purification equipment, the water purification equipment includes the pre-filter cartridge of any one of the above technical solutions.
[0032] It should be noted that the water purification equipment has all the technical effects of the pre-filter cartridge described in any one of the above technical solutions, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS
[0033] The preferred embodiments of the utility model will be described below with reference to the accompanying drawings, in which:
[0034] Figure 1 is a half sectional view of the pre-filter cartridge of the first embodiment of the utility model;
[0035] Figure 2 is a structure diagram of the membrane bag in the pre-filter cartridge of the first embodiment of the utility model Figure 1 ;
[0036] Figure 3 is a structure diagram of the membrane bag in the pre-filter cartridge of the first embodiment of the utility model Figure 2 ;
[0037] Figure 4 is a state schematic view of a plurality of membrane bags and a center tube in the pre-filter cartridge of the first embodiment of the utility model before connection and winding;
[0038] Figure 5 is a half sectional view of the pre-filter cartridge of the second embodiment of the utility model;
[0039] Figure 6 is a half sectional view of the pre-filter cartridge of the third embodiment of the utility model.
[0040] List of reference signs:
[0041] 1, center tube; 11, sealing plate; 2, membrane structure; 21, membrane bag; 211, first rectangular membrane piece; 212, second rectangular membrane piece; 221, first opening; 231, grid; 3, water isolation structure; 41, first end cover; 411, first water passage hole; 42, second end cover; 421, second water passage hole; 5, outer shell; 51, shell body; 52, cover body; 521, first water passage plug-in connector; 522, second water passage plug-in connector; 6, water flow channel. DETAILED DESCRIPTION
[0042] First, those skilled in the art should understand that the embodiments described below are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.
[0043] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "front", "back" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", "fourth" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0044] In addition, it should be noted that in the description of the utility model, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, it can be direct connection, or indirect connection. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.
[0045] In view of the problems of the prior art, such as limited filtering area, small pollution capacity and flux, and short service life of the PP cotton pre-filter element, the utility model provides a pre-filter element, which comprises a central rod, a membrane structure formed on the outer circumferential surface of the central rod and coaxial with the central rod, and a water isolation structure wrapped on the outer circumferential surface of the membrane structure; the membrane structure comprises a plurality of membrane bags arranged in layers; each membrane bag comprises two rectangular membrane sheets arranged in layers; the first side edge, the second side edge and the third side edge of the two rectangular membrane sheets in each membrane bag are connected respectively to form the first side edge, the second side edge and the third side edge of the membrane bag; the fourth side edges of the two rectangular membrane sheets in each membrane bag are connected to form a first opening at the fourth side edge of the membrane bag; the first side edge, the third side edge and the fourth side edge of adjacent two membrane bags are connected respectively, the second side edges of the adjacent two membrane bags are connected to form a second opening, and the second side edge and the fourth side edge of the membrane bag are opposite; the plurality of membrane bags are wound on the central rod in a manner that the first side edge of the membrane bag is parallel to the central rod to form the membrane structure; and the first opening and the second opening are used as one and the other of the water inlet and the water outlet respectively.
[0046] In use of the pre-filter element, one of the first opening and the second opening is used as the water inlet, and the other is used as the water outlet; water flows into the water inlet, is filtered by the membrane sheets of the membrane structure, and then flows out of the water outlet. When the first opening and the second opening are used as the water inlet and the water outlet respectively, water flows into the membrane bag from the first opening, then passes through the membrane sheets and flows into the space between the adjacent two membrane bags, and the impurities in the water are intercepted in the membrane bag; the water (i.e. filtered water) flowing into the space between the adjacent two membrane bags flows out of the second opening. When the first opening and the second opening are used as the water outlet and the water inlet respectively, water flows into the adjacent membrane bag from the second opening, then passes through the membrane sheets and flows into the membrane bag, and the impurities in the water are intercepted between the adjacent membrane bags; the water (i.e. filtered water) flowing into the membrane bag flows out of the first opening. Since the membrane structure comprises a plurality of membrane bags arranged in layers, each membrane bag comprises two rectangular membrane sheets arranged in layers, the surfaces of the two rectangular membrane sheets of the membrane bag constitute filtering surfaces, and the plurality of membrane bags are arranged in layers and wound on the central rod to form the membrane structure, the filtering area of the membrane structure is much larger than the outer circumferential surface of the membrane structure, thereby greatly increasing the filtering area, the pollution capacity and the flux of the pre-filter element, reducing the increasing speed of the thickness of the impurities on the filtering surface, and prolonging the service life of the pre-filter element. The plurality of membrane bags are wound on the central rod in a manner that the first side edge of the membrane bag is parallel to the central rod to form the membrane structure, the first opening and the second opening are located at the first end and the second end of the membrane structure respectively, and the water flow flows along the axial direction of the membrane structure; compared with the water flow flowing along a non-linear route, the water flow has relatively small resistance, and the water flow is smooth, thereby keeping a large flux of the pre-filter element.
[0047] The pre-filter element of the utility model will be described in detail below with reference to Figures 1 to 6 , wherein, Figure 1This is a half-sectional view of the pre-filter element of the first embodiment of this utility model; Figure 2 This is a schematic diagram of the membrane bag structure in the pre-filter element of the first embodiment of this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the membrane bag structure in the pre-filter element of the first embodiment of this utility model. Figure 2 ; Figure 4 This is a schematic diagram of the state of multiple membrane bags and the central tube in the pre-filter element of the first embodiment of this utility model before connection and winding; Figure 5 This is a half-sectional view of the pre-filter element according to the second embodiment of this utility model; Figure 6 This is a half-sectional view of the pre-filter element according to the third embodiment of this utility model.
[0048] In the first embodiment of this utility model, as Figure 1 and Figure 4 As shown and referenced Figure 1 As shown, the pre-filter includes a central tube 1 serving as a central rod, a membrane structure 2 formed on the outer circumferential surface of the central tube 1, a water-proof structure 3 covering the outer circumferential surface of the membrane structure 2, and a first end cap 41 installed at the upper end of the membrane structure 2. A sealing plate 11 is provided at a cross-section perpendicular to the axial direction near the lower end of the central tube 1 to block it. A first water passage hole 411 is formed on the first end cap 41. The portion of the water-proof structure 3 located at the upper end of the membrane structure 2 is sealed to the edge portion of the first end cap 41. The water-proof structure 3 is a flexible membrane (e.g., tape) wrapped around the outer circumferential surface of the membrane structure 2.
[0049] Membrane structure 2 includes multiple stacked membrane bags 21. For example... Figure 2 and Figure 3 As shown and referenced Figure 2 As shown, each membrane bag 21 includes two stacked rectangular membrane sheets. The membrane bag 21 includes a first rectangular membrane sheet 211 and a second rectangular membrane sheet 212 stacked on top of each other. The first side of the first rectangular membrane sheet 211 ( Figure 2 The front side of the first rectangular diaphragm 211 and the first side of the second rectangular diaphragm 212 ( Figure 2 The first side of the membrane bag 21 is formed by bonding the front side of the second rectangular membrane 212 to the front side of the membrane bag 21. Figure 2 The front side of the middle membrane bag 21), the second side of the first rectangular membrane 211 ( Figure 2 The left side of the first rectangular diaphragm 211 and the second side of the second rectangular diaphragm 212 Figure 2 The second side of the membrane bag 21 is formed by bonding the left side of the second rectangular membrane 212 to the left side of the membrane bag 21. Figure 2 The left side of the middle membrane bag 21), the third side of the first rectangular membrane 211 ( Figure 2 The rear side of the first rectangular diaphragm 211 and the third side of the second rectangular diaphragm 212Figure 2 The third side of the membrane bag 21 is formed by bonding the rear side of the second rectangular membrane 212 to the membrane bag 21. Figure 2 The rear side of the middle membrane bag 21), the fourth side of the first rectangular membrane 211 ( Figure 2 The right side of the first rectangular diaphragm 211 and the fourth side of the second rectangular diaphragm 212 Figure 2 The fourth side of the membrane bag 21 is formed between the right side of the second rectangular membrane 212 and the right side of the membrane bag 21. Figure 4 The first opening 221 is located on the right side of the membrane bag 21. A first water-guiding structure, which is a grid 231, is provided between the first rectangular membrane sheet 211 and the second rectangular membrane sheet 212 of each membrane bag 21. The grid 231 is made of PP, PE, PET or modified materials thereof, and has a thickness of 5mil to 34mil.
[0050] Reference Figure 4 The first side of two adjacent membrane bags 21 ( Figure 4 The front side of the middle film bag 21 is bonded together, and the third side of two adjacent film bags 21 is bonded together. Figure 4 The rear side of the middle film bag 21 is bonded together, and the fourth side of two adjacent film bags 21 is bonded together. Figure 4 The right side of the membrane bag 21 is bonded together (i.e., the rectangular membrane sheet of the first membrane bag 21 near the second membrane bag 21 is bonded together with the fourth side of the rectangular membrane sheet of the second membrane bag 21 near the first membrane bag 21), forming a second opening (not shown in the figure) between the second sides of the two adjacent membrane bags 21. A second water-guiding structure is provided between the adjacent membrane bags 21, which is a water-guiding cloth (not shown in the figure). The water-guiding cloth is made of PP, PE, PA, PET or modified materials thereof, with a thickness of 0.1 mm to 1 mm. Multiple membrane bags 21 are wound around the central tube 1 with the first side of the membrane bags 21 parallel to the central tube 1 to form a membrane structure 2; specifically, the third side of the multiple membrane bags 21 is connected to the outer circumference of the central tube 1 in an orientation parallel to the central tube 1, and the central tube 1 is arranged according to Figure 1 Rolling in the direction indicated by the middle arrow, multiple membrane bags 21 are wound around the central tube 1 to form a cylindrical membrane structure 2. Then, a flexible film is wound around the outer circumference of the membrane structure 2 to form a water-proof structure 3. The first opening 221 and the second opening are located at the left and right ends of the membrane structure 2, respectively. Finally, at the right end of the membrane structure 2 (corresponding to...) Figure 1 The upper end of the membrane structure 2 is fitted with a first end cap 41. The part of the water-proof structure 3 located at the right end of the membrane structure 2 is bonded and sealed to the edge of the first end cap 41. The second opening is connected to the first water passage hole 411.
[0051] The first rectangular membrane 211 and the second rectangular membrane 212 can be non-woven fabrics made of one or more of PP, PE, polyester, polysulfone, polyethersulfone, polyamide, polyvinylidene fluoride, carbon fiber, with a thickness of 0.15mm to 1mm and a filtration accuracy of 1nm to 100μm. The first rectangular membrane 211 and the second rectangular membrane 212 can also be microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, etc.
[0052] With reference to Figure 1 In use, the first opening 221 serves as the water inlet, and the second opening serves as the water outlet. The lower end of the pre-filter cartridge is connected to the water inlet pipeline, and the first water passage 411 on the first end cover 41 of the pre-filter cartridge is in communication with the water outlet pipeline. Water flows in the direction indicated by the arrow in Figure 5 The water supplied by the water inlet pipeline enters the membrane bag 21 from the lower end of the membrane structure 2 through the first opening 221 and flows under the drainage effect of the grid 231. The water entering the membrane bag 21 eventually passes through the first rectangular membrane 211 and the second rectangular membrane 212 in the membrane bag 21 to enter between adjacent membrane bags 21. The impurities in the water are trapped on the inner surface of the membrane bag 21. The water filtered by the first rectangular membrane 211 and the second rectangular membrane 212 flows between adjacent membrane bags 21 under the guidance of the drainage cloth and eventually flows out of the second opening. The water flowing out of the second opening flows into the water outlet pipeline through the first water passage 411.
[0053] Through the above structure of the pre-filter cartridge, since the membrane structure 2 includes a plurality of membrane bags 21 stacked on each other, each membrane bag 21 includes two stacked rectangular membranes, the surfaces of the two rectangular membranes of the membrane bag 21 constitute the filtration surface, and the plurality of membrane bags 21 are stacked and wound on the central pipe 1 to form the membrane structure 2, so that the filtration area of the membrane structure 2 is much larger than the outer circumferential surface of the membrane structure 2, thereby greatly increasing the filtration area, the impurity holding capacity and the flux of the pre-filter cartridge, reducing the increase speed of the impurity thickness on the filtration surface, and prolonging the service life of the pre-filter cartridge. The plurality of membrane bags 21 are wound on the central pipe 1 in a manner that the first side edge of the membrane bag 21 is parallel to the central pipe 1 to form the membrane structure 2. The first opening 221 and the second opening are located at the two ends of the membrane structure 2, respectively. The water flow flows along the axial direction of the membrane structure 2. Compared with the water flow flowing along a non-linear route, the water flow has relatively small resistance, thereby improving the smoothness of the water flow, so that the pre-filter cartridge maintains a large flux.
[0054] The first water guide structure is arranged between the first rectangular membrane 211 and the second rectangular membrane 212 of each membrane bag 21, and the second water guide structure is arranged between adjacent membrane bags 21, thereby increasing the gap between the rectangular membranes, avoiding the adhesion between the rectangular membranes to increase the resistance of the water flow, improving the smoothness of the water flow, and allowing more impurities to be accommodated between the rectangular membranes, thereby increasing the flux and the impurity holding capacity of the pre-filter cartridge and further prolonging the service life of the pre-filter cartridge.
[0055] The center tube 1 blocked by the sealing plate 11 as the center rod can reduce the weight of the center rod, thereby reducing the weight of the pre-filter, facilitating the taking, placing and disassembling of the pre-filter.
[0056] The pre-filter comprises a first end cover 41 installed at the upper end of the membrane structure 2, and a first water passage hole 411 is formed on the first end cover 41, and the second opening at the upper end of the membrane structure 2 is communicated with the first water passage hole 411, so that the connection between the external waterway and the second opening is facilitated, and the upper end of the membrane structure 2 is protected, thereby reducing the risk of damage to the upper end of the membrane structure 2 due to collision during installation.
[0057] It should be noted that the first water guide structure is a grid 231, and the second water guide structure is a water guide cloth, which is only a specific setting mode, and in actual application, it can be adjusted, for example, the first water guide structure can also be a water guide cloth or other suitable water guide structure, and the second water guide structure can also be a grid or other suitable water guide structure. In addition, the first water guide structure is arranged between the first rectangular membrane 211 and the second rectangular membrane 212 of each membrane bag 21, and the second water guide structure is arranged between adjacent membrane bags 21, which is only a more preferred setting mode, and in actual application, it can be adjusted, for example, only one of the first water guide structure and the second water guide structure is arranged, or the first water guide structure and the second water guide structure are not arranged. In addition, the first opening 221 is used as the water inlet, and the second opening is used as the water outlet, which is also a specific setting mode, and in actual application, it can be adjusted, for example, the first opening 221 in the first embodiment can be used as the water outlet, and the second opening can be used as the water inlet.
[0058] It should be further explained that the center tube 1 is blocked by the sealing plate 11 at a position perpendicular to the axial direction near the lower end, which is only a specific arrangement, and in actual application, it can be adjusted, for example, the center tube 1 can be blocked by a sealing plate at a position perpendicular to the axial direction in the middle, or the center tube 1 can be blocked by a sealing plate at a position perpendicular to the axial direction at each end, or other blocking methods can be used, as long as at least one position of the center tube 1 perpendicular to the axial direction is blocked. Moreover, the center tube 1 blocked at at least one position perpendicular to the axial direction as the center rod, which is only a more preferred arrangement, and in actual application, it can be adjusted, for example, the center rod can also be arranged as a solid rod. In addition, the third side of the plurality of film bags 21 is connected to the outer circumferential surface of the center tube 1 in parallel to the center tube 1 and wound on the center tube 1 to form a cylindrical film structure 2, which is also a specific arrangement, and in actual application, it can be adjusted, for example, the first side of the plurality of film bags 21 can be connected to the outer circumferential surface of the center tube 1 in parallel to the center tube 1 and wound on the center tube 1 to form a cylindrical film structure 2. In addition, the water-proof structure 3 is a flexible film wound on the outer circumferential surface of the film structure 2, which is also a specific arrangement, and in actual application, it can be adjusted, for example, the water-proof structure 3 is a rigid cylinder wound on the outer circumferential surface of the film structure 2.
[0059] In the second embodiment of the present application, as shown in Figure 5 different from the first embodiment, the pre-filter element further comprises a second end cover 42 installed at the lower end of the film structure 2, a second water passage hole 421 is formed on the second end cover 42, and the part of the water-proof structure 3 located at the lower end of the film structure 2 is sealingly connected with the edge part of the second end cover 42, and the second opening located at the lower end of the film structure 2 is in communication with the second water passage hole 421.
[0060] Through such an arrangement, not only is the connection of the external waterway with the second opening located at the lower end of the film structure 2 facilitated, but also the lower end of the film structure 2 is protected, reducing the risk of damage to the lower end of the film structure 2 due to bumps during installation.
[0061] In the third embodiment of the present application, as shown in different from the first embodiment, the pre-filter element further comprises a housing 5, the housing 5 comprises a shell 51 with an open upper end and a cover 52 installed at the upper end of the shell 51, the cover 52 is provided with a first water passage plug-in connector 521 and a second water passage plug-in connector 522, the first water passage plug-in connector 521 is in communication with the first water passage hole 411, a water flow channel 6 is formed between the housing 5 and the water-proof structure 3, and the second water passage plug-in connector 522 is in communication with the second opening located at the lower end of the film structure 2 through the water flow channel 6.
[0062] Through the arrangement, when the pre-filter is installed into the installation position of the water purification device, only one end of the shell 5 with the first water passage plug-in connector 521 and the second water passage plug-in connector 522 is inserted into the installation position, the connection between the water passage of the pre-filter and the water passage of the water purification device can be quickly realized, and the installation of the pre-filter is facilitated.
[0063] In another possible embodiment, different from the first embodiment, the first end cover 41 is not arranged.
[0064] Preferably, the first rectangular membrane sheet 211 and the second rectangular membrane sheet 212 in the plurality of membrane bags 21 in each of the above embodiments are formed by folding one membrane sheet, so that the connecting process of the side edges of the rectangular membrane sheets is reduced, and the manufacturing efficiency of the pre-filter is improved.
[0065] Preferably, the thickness of the water guide structure for guiding raw water (i.e. water before filtration) in the first water guide structure and the second water guide structure is greater than the thickness of the water guide structure for guiding purified water. Through the arrangement, the membrane structure 2 can accommodate more impurities, so that the flux and the pollution capacity of the pre-filter are increased, and the service life of the pre-filter is further prolonged.
[0066] In addition, the utility model also provides a water purification device, the water purification device includes the pre-filter of any one of the above embodiments.
[0067] It should be noted that the water purification device has all the technical effects of the pre-filter described in any one of the above embodiments, and will not be described here. In addition, the water purification device can be a water purification machine or a water heating integrated machine.
[0068] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical scheme after the changes or replacements will fall within the protection scope of the utility model.
Claims
1. A pre-filter cartridge, characterized by, The pre-filter cartridge comprises a center rod, a membrane structure (2) formed on the outer circumferential surface of the center rod and coaxial with the center rod, and a water-proof structure wrapped on the outer circumferential surface of the membrane structure (2); The membrane structure (2) comprises a plurality of membrane bags (21) stacked; each of the membrane bags (21) comprises two stacked rectangular membrane sheets (211, 212), the first side edge, the second side edge and the third side edge of the two rectangular membrane sheets (211, 212) in each of the membrane bags (21) are connected to form the first side edge, the second side edge and the third side edge of the membrane bag (21), respectively, and the fourth side edges of the two rectangular membrane sheets (211, 212) in each of the membrane bags (21) are connected to form a first opening (221) at the fourth side edge of the membrane bag (21); The first side edge, the third side edge and the fourth side edge of adjacent two membrane bags (21) are connected, respectively, and the second side edges of adjacent two membrane bags (21) are connected to form a second opening, and the second side edge of the membrane bag (21) is opposite to the fourth side edge; The plurality of membrane bags (21) are wound on the center rod with the first side edge of the membrane bag (21) parallel to the center rod to form the membrane structure (2); The first opening (221) and the second opening are used as one and the other of the water inlet and the water outlet, respectively.
2. The prefilter cartridge of claim 1, wherein, The pre-filter cartridge further comprises a first end cover (41) installed at the first end of the membrane structure (2), a first water passage hole (411) is formed on the first end cover (41), the water-proof structure is sealingly connected to the edge portion of the first end cover (41) at the portion of the first end of the membrane structure (2), and the openings of the first opening (221) and the second opening at the first end of the membrane structure (2) are in communication with the first water passage hole (411).
3. The prefilter cartridge of claim 2, wherein, The pre-filter cartridge further comprises a second end cover (42) installed at the second end of the membrane structure (2), a second water passage hole (421) is formed on the second end cover (42), the water-proof structure is sealingly connected to the edge portion of the second end cover (42) at the portion of the second end of the membrane structure (2), and the openings of the first opening (221) and the second opening at the second end of the membrane structure (2) are in communication with the second water passage hole (421).
4. The prefilter cartridge of claim 2 or 3, wherein, The pre-filter cartridge further comprises an outer shell (5), a water flow channel (6) is formed between the outer shell (5) and the water-proof structure, the first water passage plug-in connector (521) and the second water passage plug-in connector (522) are arranged on the end portion of the outer shell (5) close to the first end of the membrane structure (2), the first water passage plug-in connector (521) is in communication with the first water passage hole (411), and the second water passage plug-in connector (522) is in communication with the first opening (221) and the openings of the second opening at the second end of the membrane structure (2) through the water flow channel (6).
5. The prefilter cartridge of any one of claims 1-3, wherein, The water-proof structure is a flexible film wrapped on the outer circumferential surface of the membrane structure (2); and / or The center rod is a center tube (1), and at least one cross section of the center tube (1) perpendicular to the axial direction is blocked.
6. The prefilter cartridge of any one of claims 1-3, wherein, All the rectangular membrane sheets (211, 212) in the plurality of membrane bags (21) are formed by folding one membrane sheet.
7. The prefilter cartridge of any one of claims 1-3, wherein, The first water guide structure is provided between the two rectangular membrane sheets (211, 212) of each membrane bag (21); and / or the second water guide structure is provided between adjacent membrane bags (21).
8. The prefilter cartridge of claim 7, wherein, The first water guide structure is a water guide cloth or a grid. The second water guide structure is a water guide cloth or a grid. The thickness of the water guide structure for guiding raw water in the first water guide structure and the second water guide structure is greater than the thickness of the water guide structure for guiding purified water.
9. The pre-filter cartridge of any one of claims 1-3, wherein, The material of the rectangular membrane sheet (211, 212) is non-woven fabric, microfiltration membrane, ultrafiltration membrane or nanofiltration membrane.
10. A water purification apparatus characterized by comprising: The water purification device comprises the pre-filter element according to any one of claims 1 to 9.