Multi-stage filter element pressure barrel water purifier

Abstract

The utility model provides a multi-stage filter element pressure barrel water purifier, which relates to the technical field of water purifiers and comprises a housing and a bottom shell which are symmetrically designed into a rectangular bowl-shaped structure and are connected through a middle frame. The bottom shell is provided with a small step positioning middle frame and is fixed through screws, so that the structural stability is ensured. And the housing is connected with the middle frame through a buckle. The cylindrical filter elements are arranged on the two sides and the upper portion of the water pump and connected through the filter element clamps, and the water flow path is optimized. The middle frame is integrally provided with a filter element clamp, the bottom arc surface is matched with the radian of the pressure barrel, and each edge is provided with a groove and a buckle groove. And a 18S wastewater electromagnetic valve and a water inlet electromagnetic valve are arranged on one side of the water pump mounting position. The upper surface of the housing is provided with a window patch, and a transparent window is arranged below the housing. The left side of the housing is provided with an inlet-outlet joint. And the pressure barrel and the water storage tank are integrated in the whole machine. The water purifier is integrated, modularized and intelligent, and provides a multi-stage filtering water purification solution which saves space and is easy to install and maintain.

Description

Technical Field

[0001] This utility model relates to a water purifier, specifically a multi-stage filter pressure tank water purifier, and belongs to the field of water purifier technology. Background Technology

[0002] A water purifier is a household appliance designed to remove impurities, harmful substances, and odors from water using various technologies such as physical filtration, adsorption, ion exchange, and ultraviolet disinfection, providing safe and healthy drinking water. It typically contains multi-stage filter cartridges, including PP cotton, activated carbon, ultrafiltration membranes, and reverse osmosis membranes, to intercept contaminants of different sizes. Water purifiers are available in various installation methods, including under-counter, countertop, wall-mounted, and portable models, to adapt to different usage environments. Intelligent functions such as filter replacement reminders, water quality monitoring, and leak protection further enhance the user experience. Furthermore, water-saving design and energy-efficient operation are also important features of modern water purifiers, reducing both wastewater discharge and energy consumption. Water purifiers are widely used in homes, offices, and commercial settings, serving as an important tool for improving drinking water quality.

[0003] Prior art document CN207072865U discloses a water purifier whose structure includes: an upper shell, fixed silica gel, a main filter cartridge outer cylinder, a filter cartridge cover, an internal filter cartridge, a first filter cartridge nozzle, a first filter cartridge nozzle with a small waterproof ring, a first filter cartridge nozzle, a first filter cartridge nozzle with a waterproof ring, a small waterproof ring, a main body middle shell, a main body bottom shell, a PP cotton filter cartridge, a resin filter cartridge, an RO filter cartridge, a sintered carbon filter cartridge, a filter cartridge, calcium sulfite, maifanite, weakly alkaline balls, activated carbon, a filter nozzle, a second filter cartridge nozzle, a second filter cartridge nozzle with a waterproof ring, a second filter cartridge nozzle with a small waterproof ring, a second filter cartridge nozzle, and a filter cartridge outer cylinder. The beneficial effects of this invention are: by using a sintered carbon filter cartridge on top of existing water purifiers, the activated carbon inside the filter cartridge can better improve water quality and is more beneficial to human health. However, the water storage tank of this water purifier is separate from the water purifier itself, requiring separate installation with a water source, which is cumbersome and requires a large space. Traditional cabinet-type water purifiers have limited internal space, typically requiring 2 to 5 filter stages, and their positions are fixed and difficult to change. Traditional water purifier filter clips need to be installed separately, increasing space and cost. Utility Model Content

[0004] This utility model addresses the problems of water purifiers being separated from water storage tanks, having limited internal space, and having low-level filter cartridges by providing a multi-stage filter cartridge pressure tank water purifier. It includes a cover, a bottom shell, and a water pump. The cover and bottom shell are symmetrical rectangular bowl-shaped structures with a middle frame connecting them. A pressure tank is located between the bottom shell and the middle frame, and a water pump is located between the cover and the middle frame. Several types of filter cartridges are arranged around the water pump.

[0005] Preferably, the bottom shell has a small stepped positioning frame, and screw holes are provided in both the frame and the bottom shell. Screws are used to secure the frame to the bottom shell. A U-shaped locking foot is provided above the connection between the cover and the frame, and the cover and frame are connected by a snap-fit ​​mechanism. The small stepped positioning frame on the bottom shell, combined with the screw holes and screws, ensures the stability and safety of the water purifier structure. The U-shaped locking foot and snap-fit ​​connection between the cover and the frame not only makes installation and disassembly simple and quick, but also enhances waterproofing and aesthetics, provides a good seal, protects internal components from moisture, extends the lifespan of the water purifier, and makes maintenance and cleaning more convenient.

[0006] Preferably, filter elements are arranged on both sides and above the water pump. Each filter element is cylindrical, and filter element clips connect every two filter elements, with the filter elements arranged sequentially. The design of arranging cylindrical filter elements on both sides and above the water pump, and connecting every two filter elements sequentially with filter element clips, optimizes the water flow path, improves filtration efficiency, and makes filter element replacement and maintenance simple and quick.

[0007] Preferably, the left side of the water pump is equipped with a carbon rod filter and a PP filter, the upper side is equipped with a post-activated carbon filter and a post-mineralized ball, and the right side of the water pump is equipped with an RO reverse osmosis filter and an activated carbon filter.

[0008] Preferably, the filter cartridge clamp is integrally integrated into the middle frame, and the bottom of the middle frame has an arc surface that matches the curvature of the pressure tank. Several grooves are formed on each side of the middle frame, and additional snap-fit ​​slots are provided on the front and rear sides. The integral filter cartridge clamp, the matching arc surface at the bottom with the curvature of the pressure tank, the grooves on each side, and the additional snap-fit ​​slots on the front and rear sides together constitute a structure that is both stable and easy to install. This design not only enhances the overall structural stability and reduces the risk of leakage, but also provides installation space for pipelines and other accessories, resulting in a more compact and rational layout. The snap-fit ​​slot design simplifies the assembly process, allowing for quick assembly and disassembly without additional tools, thus improving assembly efficiency.

[0009] Preferably, an 18S wastewater solenoid valve and an inlet solenoid valve are provided on one side of the water pump mounting position on the middle frame, with the two solenoid valves arranged side by side.

[0010] Preferably, the upper surface of the casing is fitted with a window panel, and a transparent window is provided below it, with a computer panel located below the transparent window. This design of the upper surface of the casing fitting with the window panel, combined with the transparent window below, not only enhances the aesthetics of the water purifier but also allows users to intuitively monitor the device's operating status. The integrated computer panel below the transparent window provides an intuitive user interface, making operation more convenient. Simultaneously, through intelligent management functions, users can easily record and monitor the water purifier's usage data, such as filtration volume and filter life, enabling fault diagnosis and energy-saving alerts, thereby improving user experience and equipment management efficiency.

[0011] Preferably, an inlet / outlet connector is provided on the left side of the casing.

[0012] The beneficial effects of this utility model are: the pressure tank and water storage tank are integrated inside the whole machine, forming an integrated design that saves installation space for the user, making the water purifier look neat and easy to place in the kitchen or any small space. Furthermore, the design allows users to continuously add up to eight filter cartridges as needed to achieve multi-stage filtration. This flexibility allows the water purifier to adapt to different water qualities and filtration needs, providing a more personalized water purification solution.

[0013] The water purifier is equipped with a smart chip that enables data transmission and monitoring. Users can receive real-time updates on key information such as water quality and filter lifespan through smart devices. This intelligent management not only improves the convenience of the water purifier but also ensures continuous monitoring and maintenance of water quality, allowing users to keep track of the purifier's operating status and perform necessary maintenance and filter replacements in a timely manner.

[0014] The entire unit consists of three main plastic components. These components are simply designed and easy to assemble and disassemble, greatly simplifying the installation process. Users can quickly assemble and perform routine maintenance on the water purifier without needing complicated tools or professional knowledge. This easy-to-assemble and disassemble design makes the water purifier more user-friendly.

[0015] The middle frame integrates the filter cartridge clip. This integrated design not only eliminates the need for separate filter cartridge installation but also effectively reduces the size of the water purifier, making it more compact. This space-saving design enhances the overall aesthetics and practicality of the water purifier, allowing it to adapt to a wider range of installation environments while maintaining high-efficiency filtration performance. Attached Figure Description

[0016] Figure 1 This is an exploded view of the components of the multi-stage filter pressure tank water purifier of this utility model.

[0017] Figure 2 This is a schematic diagram of the multi-stage filter cartridge pressure tank water purifier of this utility model.

[0018] Figure 3 This is a cross-sectional schematic diagram of the frame connection in this utility model.

[0019] In the diagram: 1. Window panel; 2. Transparent window; 3. Computer board; 4. Cover; 5. Post-activated carbon filter; 6. Activated carbon filter; 7. RO reverse osmosis filter; 8. Water pump; 9. Middle frame; 10. Pressure tank; 11. Bottom shell; 12. Post-mineralization ball; 13. High-pressure switch; 14. Carbon rod filter; 15. PP filter; 16. 18S wastewater solenoid valve; 17. Inlet solenoid valve; 18. Inlet / outlet connector; 19. Low-pressure switch; 20. Clip; 21. Clip foot; 22. Screw. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 The diagram shows a multi-stage filter cartridge pressure tank water purifier, including a cover 4, a bottom shell 11, and a water pump 8. The cover 4 and the bottom shell 11 are symmetrical rectangular bowl-shaped structures, connected by a middle frame 9. A pressure tank 10 is located between the bottom shell 11 and the middle frame 9. The water pump 8 is located between the cover 4 and the middle frame 9, and several filter cartridges are arranged around the water pump 8.

[0022] The symmetrical rectangular bowl-shaped structure of the casing 4 and the bottom casing 11, along with the ingenious connection of the middle frame 9, allows the water purifier to maintain a compact appearance while making full use of the internal space. The multi-stage filter design in the water purifier can filter different contaminants in the water step by step. The primary PP cotton filter effectively intercepts large particles such as sediment and rust; the activated carbon filter 6 adsorbs residual chlorine, odors, and some organic pollutants; the reverse osmosis or ultrafiltration membrane further removes bacteria, viruses, and smaller particles; and the post-activated carbon filter 65 improves the taste of the water, ensuring clear and sweet-smelling water. The filter elements surrounding the water pump 8 not only improve filtration efficiency but also reduce the direct impact of impurities in the water on the water pump 8, thereby extending the service life of the water pump 8 and reducing the frequency of maintenance and replacement.

[0023] The integrated design of the cover 4, bottom shell 11 and middle frame 9 enhances the overall stability and durability of the water purifier and reduces the risk of failure due to loose or detached parts.

[0024] The bottom shell 11 is equipped with a small step for positioning the middle frame 9. Screw holes are provided between the middle frame 9 and the bottom shell 11, and screws are used to secure the middle frame 9 to the bottom shell 11. A Z-shaped locking foot 21 is provided above the connection between the cover 4 and the middle frame 9, and the cover 4 is connected to the middle frame 9 via a snap-fit ​​20. The bottom shell 11, with its small step for positioning the middle frame 9 and the screw holes and screws for fixation, ensures the stability and safety of the water purifier structure. The Z-shaped locking foot 21 and snap-fit ​​20 connection between the cover 4 and the middle frame 9 not only make installation and disassembly simple and quick, but also enhance waterproof performance and aesthetics, while providing a good sealing effect to protect internal components from moisture, extend the service life of the water purifier, and make maintenance and cleaning more convenient.

[0025] The small steps on the bottom shell 11 not only provide a clear installation reference for the middle frame 9, but also ensure consistency and repeatability in each installation, which is beneficial for maintaining the long-term stability and performance of the equipment. The middle frame 9 is secured to the bottom shell 11 via screw holes and screws, forming a robust base. This mechanical connection method greatly enhances the strength and durability of the overall structure, maintaining stability even under high pressure or vibration environments. The screw connection design allows users to easily disassemble and reinstall the middle frame 9, making regular maintenance and filter replacement more convenient and reducing maintenance costs and time.

[0026] The Z-shaped locking feet 21 and snap fasteners 20 provide additional fixing points for the housing 4 and the middle frame 9, which not only enhances the stability of the structure but also improves the shock resistance of the equipment, ensuring reliable operation in various environments. Reinforcing ribs are also provided at the connection between the Z-shaped locking feet 21 and the housing 4 to ensure the connection strength of the locking feet 21. The snap fasteners 20 connection allows for a tight fit between the housing 4 and the middle frame 9 without exposed screws or fasteners. Furthermore, the snap fasteners 20 connection provides a good seal, effectively preventing water and water vapor penetration, protecting internal circuits and mechanical components from moisture and corrosion, and extending the service life of the equipment.

[0027] The integrated design of the clips 21 and buckles 20 reduces the use of additional accessories, simplifies the production and assembly process, lowers manufacturing costs, and also reduces maintenance issues caused by lost or damaged accessories. The buckle 20 connection ensures that the cover 4 will not accidentally fall off when the water purifier is in operation, avoiding water pollution or equipment damage caused by the cover 4 falling off, and improving safety during use.

[0028] Filter cartridges are installed on both sides and top of the water pump 8. Each filter cartridge is cylindrical, and filter cartridge clips connect every two filter cartridges. The filter cartridges are arranged in sequence. The design of installing cylindrical filter cartridges on both sides and top of the water pump 8 and connecting every two filter cartridges in sequence with filter cartridge clips optimizes the water flow path, improves filtration efficiency, and makes filter cartridge replacement and maintenance simple and quick.

[0029] Cylindrical filter cartridges offer a larger filtration area, thus improving filtration efficiency and effectiveness. The multi-stage filtration system filters different contaminants in the water step-by-step. Each stage targets specific contaminants; for example, the PP cotton filter removes large particles, the activated carbon filter removes residual chlorine and odors, the reverse osmosis or ultrafiltration membrane further removes bacteria, viruses, and other microorganisms, and the post-activated carbon improves taste. The filter clip design simplifies installation and replacement, allowing users to easily remove and replace cartridges for routine maintenance, ensuring continuous water purification. The cylindrical filter cartridge design also makes full use of the internal space of the water purifier.

[0030] The head of the water pump 8 is shaped like an arc egg, with water outlets on both sides. The design of water outlets on both sides allows users to choose different water outlets according to different needs. For example, one side can be for purified drinking water, and the other side can be for domestic water, which can more flexibly meet the water needs of the family.

[0031] The water pump 8 has a carbon rod filter 14 and a PP filter 15 on its left side, and a post-activated carbon filter 65 and a post-mineralizing ball 12 on its upper side. The water pump 8 has an RO reverse osmosis filter 7 and an activated carbon filter 6 on its right side. The carbon rod filter 14 further removes chlorine, organic compounds, discoloration, odor, and turbidity, providing deeper water purification. The PP filter 15, also known as a polypropylene melt-blown filter, mainly filters large particles such as sediment, rust, and suspended solids from tap water, serving as primary filtration and protecting subsequent filters. The post-activated carbon filter 65, located after the RO membrane, primarily improves the taste of the water by adsorbing discoloration and odor, making the water sweeter and more palatable. It also inhibits bacterial growth, ensuring the freshness of the water. The post-mineralizing ball 12 releases beneficial minerals such as zinc, lithium, iodine, and selenium, increasing the content of beneficial minerals in the water and enhancing its nutritional value. The RO reverse osmosis filter cartridge 7 boasts extremely high filtration precision, with a pore size of 0.0001 microns, effectively removing bacteria, viruses, heavy metals, and other organic impurities from the water, providing near-pure water quality. The activated carbon filter cartridge 6 effectively removes residual chlorine, odors, discoloration, and some organic pollutants from the water, improving its taste and aroma. Through the combination of filter cartridges with different functions, multi-stage filtration from coarse to fine filtration is achieved, not only improving water purity and taste but also increasing the amount of beneficial minerals, providing users with safe, healthy, and excellent-tasting drinking water.

[0032] The middle frame 9 is integrally equipped with a filter cartridge clamp. The bottom of the middle frame 9 has an arc-shaped surface that matches the curvature of the pressure tank 10. Each side of the middle frame 9 has several grooves, and additional snap-fit ​​slots 20 are provided on the front and rear sides. The integral filter cartridge clamp, the matching arc-shaped bottom surface with the pressure tank 10, the grooves on each side, and the additional snap-fit ​​slots on the front and rear sides together constitute a stable and easy-to-install structure. This design not only enhances the overall structural stability and reduces the risk of leakage, but also provides installation space for pipelines and other accessories, resulting in a more compact and rational layout. The snap-fit ​​slots 20 simplify the assembly process, allowing for quick assembly and disassembly without additional tools, thus improving assembly efficiency.

[0033] The middle frame 9 has two arc-shaped surfaces in the middle, the curvature of which matches that of the pressure tank 10. Each end of the surface has a three-quarter arc clamping part for holding the filter element. A quarter arc base is also provided in the middle of one of the arc-shaped surfaces, matching the water pump 8. Several interfaces are provided in the middle of the arc-shaped surface on one side for connecting to a solenoid valve. After the middle frame 9 and pressure tank 10 are connected, a buckle 20 is provided at the edge, allowing for tightening with screws 22.

[0034] The double-arc surface of the middle frame 9 precisely corresponds to the curvature of the pressure tank 10, ensuring maximum sealing interface between them and thus improving sealing performance. This is crucial for maintaining the stability of the water purifier under high-pressure environments and preventing liquid leakage. The three-quarter arc clamping part in the design provides a robust support structure for fixing the filter element. This structural design reduces the risk of filter element displacement or damage due to mechanical vibration or hydrodynamic effects. The precise fit design of the quarter-arc base with the pump body reduces pump vibration and noise during operation, improving equipment operating efficiency and lifespan. Multiple interfaces set in the middle of the arc surface enable quick docking of the solenoid valve with the pump body. This layout simplifies the assembly process, reduces assembly error rate, and facilitates subsequent maintenance and replacement. The combined use of clips 20 and screws 22 provides a tool-free quick connection method while ensuring mechanical stability of the connection. This design improves assembly efficiency and ensures connection reliability under various operating conditions.

[0035] The integrated filter clip design enhances the overall rigidity of the middle frame 9, strengthens the water purifier's resistance to water pressure fluctuations and external impacts, and reduces the risk of structural deformation.

[0036] The curved surface at the bottom of the middle frame 9 precisely aligns with the curvature of the pressure tank 10, ensuring a tight seal between the two and effectively preventing water leakage, thus enhancing the safety of the equipment. The grooved design on the edge of the middle frame 9 provides additional anchor points for fixing pipelines or other components, making the internal component layout more compact and orderly.

[0037] The snap-fit ​​20 slot design simplifies the connection process between the middle frame 9 and other components, eliminating the need for additional fasteners or complex tools. This reduces assembly complexity and time costs, improving production efficiency. The snap-fit ​​20 connection also simplifies the disassembly and assembly process of the water purifier, allowing users to easily replace and clean the filter cartridges without requiring professional technical support.

[0038] On one side of the water pump 8 mounting location on the middle frame 9, there are two solenoid valves: an 18S wastewater solenoid valve 16 and an inlet solenoid valve 17, arranged side by side. This side-by-side arrangement of the wastewater and inlet solenoid valves 17 integrates water flow control, simplifies the user interface, and makes operation more intuitive and convenient. The 18S wastewater solenoid valve 16 can perform rapid flushing, and its side-by-side arrangement with the inlet solenoid valve 17 allows the system to quickly switch between inlet and outlet modes, improving system response speed. The side-by-side arrangement of the solenoid valves also makes maintenance easier, reducing the need to disassemble other components and lowering maintenance complexity and cost.

[0039] The upper surface of the casing 4 is fitted with a window panel 1, and a transparent window 2 is located below it. Below the transparent window 2 is a computer panel 3. This design of the upper surface of the casing 4 and the window panel 1, combined with the transparent window 2, not only enhances the aesthetics of the water purifier but also allows users to intuitively monitor the device's operating status. The integrated computer panel 3 below the transparent window 2 provides an intuitive user interface, making operation more convenient. Simultaneously, through intelligent management functions, users can easily record and monitor the water purifier's usage data, such as filtration volume and filter life, enabling fault diagnosis and energy-saving alerts, thereby improving user experience and equipment management efficiency.

[0040] The left side of the casing 4 is equipped with inlet and outlet connectors 18. Furthermore, inside the water purifier, depending on the piping, the high-pressure switch 13 and the low-pressure switch 19 can be placed in different locations, effectively utilizing space. Separate installation of the high-pressure switch 13 and low-pressure switch 19 allows for individual operation during maintenance and repair, reducing the impact on the water purification system. The positions of the high-pressure switch 13 and low-pressure switch 19 can be flexibly adjusted according to different application scenarios and needs, adapting to different system configurations and operating conditions, providing considerable convenience for users and manufacturers.

[0041] The bottom of the base shell has a grid pattern for effective anti-slip properties. Both the bottom shell and the cover shell have rounded recesses on both sides for easy handling and aesthetic appeal.

[0042] This utility model proposes an innovative multi-stage filter pressure tank water purifier, employing a symmetrical rectangular bowl-shaped structure of a casing 4 and a bottom casing 11, connected by a middle frame 9 to form a stable sandwich structure. The bottom casing 11 is designed with small steps to precisely position the middle frame 9, and is secured with screw holes and screws, ensuring the stability and safety of the water purifier structure. Above the connection between the casing 4 and the middle frame 9, a Z-shaped locking foot 21 is designed, connected by a buckle 20, simplifying the installation and disassembly process while enhancing waterproof performance and aesthetics. It provides a good sealing effect, protecting internal components from moisture, extending the water purifier's lifespan, and making maintenance and cleaning more convenient. Cylindrical filter elements are arranged on both sides and above the water pump 8, with each pair of filter elements connected by a filter element clamp, optimizing the water flow path, improving filtration efficiency, and making filter element replacement and maintenance simple and quick. The middle frame 9 features an integrated filter cartridge clip, and its bottom has an arc surface that matches the curvature of the pressure tank 10. Several grooves are formed along each side, and additional snap-fit ​​slots are provided on the front and rear sides, creating a stable and easy-to-install structure. On one side of the water pump 8 mounting position on the middle frame 9, there is an 18S wastewater solenoid valve 16 and an inlet solenoid valve 17, arranged side-by-side to simplify water circuit connections. The upper surface of the casing 4 has a window panel 1, with a transparent window 2 below. Below the transparent window 2 is a computer panel 3, providing an intuitive user interface for easier operation. Through intelligent management functions, users can easily record and monitor the water purifier's usage data. The left side of the casing 4 has inlet and outlet connectors 18 for easy water pipe connection. The pressure tank and water storage tank are integrated inside the entire unit, forming a unified design that saves installation space and results in a clean appearance, making it easy to place in the kitchen or any small space. Users can stack up to eight filter cartridges as needed to achieve multi-stage filtration, adapting to different water qualities and filtration requirements. The water purifier is equipped with a smart chip, enabling data transmission and monitoring. Users can receive real-time updates on key information such as water quality and filter cartridge lifespan via smart devices. The entire unit's mounting components consist of three main plastic parts, which are simple in design and easy to assemble and disassemble, greatly simplifying the installation process. The middle frame 9 integrates the filter cartridge clip; this integrated design not only eliminates the need for additional filter cartridge installation steps but also effectively reduces the size of the water purifier, improving its overall aesthetics and practicality. In summary, this utility model's water purifier design, through integrated, modular, and intelligent design, provides a space-saving, easy-to-install, and easy-to-maintain multi-stage filtration water purification solution, meeting the high-quality demands of modern families for healthy drinking water.

[0043] The scope of protection of this utility model is not limited to the specific embodiments described herein, but is determined by the appended claims and equivalents recognized under patent law. This means that all technical solutions that are the same as or equivalent to this utility model in principle and spirit are within the scope of protection of this utility model. Therefore, the inventiveness and practicality of this utility model are not limited to the form currently shown, but also include all possible and reasonable derivatives and extensions.

Claims

1. A multi-stage filter cartridge pressure tank water purifier, comprising a casing (4), a bottom shell (11), and a water pump (8), characterized in that, The cover (4) and the bottom shell (11) are symmetrical rectangular bowl-shaped structures, with a middle frame (9) connecting them; A pressure tank (10) is provided between the bottom shell (11) and the middle frame (9), and a water pump (8) is provided between the cover (4) and the middle frame (9). Several kinds of filter elements are arranged around the water pump (8).

2. The multi-stage filter cartridge pressure tank water purifier according to claim 1, characterized in that, The bottom shell (11) is provided with a small step to position the middle frame (9). The middle frame (9) and the bottom shell (11) are provided with screw holes. The middle frame (9) and the bottom shell (11) are fixed by screws. The cover (4) and the middle frame (9) are provided with a Z-shaped clip (21) above the connection. The cover (4) and the middle frame (9) are connected by a buckle (20).

3. A multi-stage filter cartridge pressure tank water purifier according to claim 1, characterized in that, The water pump (8) is equipped with filter elements on both sides and above. Each filter element is a cylinder, and there is a filter element clamp between every two filter elements. The filter elements are arranged in sequence.

4. A multi-stage filter cartridge pressure tank water purifier according to claim 3, characterized in that, The water pump (8) has a carbon rod filter (14) and a PP filter (15) on the left side, a post-activated carbon filter (5) and a post-mineralized ball (12) on the upper side, and an RO reverse osmosis filter (7) and an activated carbon filter (6) on the right side.

5. A multi-stage filter cartridge pressure tank water purifier according to claim 1, characterized in that, The middle frame (9) is integrally equipped with a filter element clip. The bottom of the middle frame (9) is provided with an arc surface, which matches the curvature of the pressure tank (10). Each side of the middle frame (9) is provided with several grooves, and additional buckle grooves are provided on the front and rear sides.

6. A multi-stage filter cartridge pressure tank water purifier according to claim 2 or 5, characterized in that, On one side of the water pump (8) mounting position on the middle frame (9), there is an 18S wastewater solenoid valve (16) and an inlet solenoid valve (17), with the two solenoid valves arranged side by side.

7. A multi-stage filter cartridge pressure tank water purifier according to claim 1, characterized in that, The upper surface of the cover (4) is fitted with a window faceplate (1), and a transparent window (2) is provided below it. A computer board (3) is provided below the transparent window (2).

8. A multi-stage filter cartridge pressure tank water purifier according to claim 1 or 7, characterized in that, An inlet / outlet connector (18) is provided on the left side of the cover (4).

Images