A multi-stage filtering device for ultra-pure water filtration

Abstract

The utility model discloses a multistage filter equipment for ultrapure water filtration relates to filter equipment technical field, including: bottom plate, sand filter cartridge, carbon filter cartridge, softening cylinder and precision filter, first flange plate, second flange plate and fine hole tray, the top of first flange plate is equipped with connecting screw groove, and the bottom of top cover is installed with second flange plate, the outer wall of second flange plate is installed with connecting screw rod, the inner wall of second flange plate is equipped with connecting channel, and the inner wall of inlay groove is installed with rubber sealing ring. The utility model discloses through being installed with filter material replacement mechanism, removes connecting screw rod from connecting screw groove, then pulls top cover and makes second flange plate remove from first flange plate, then removes top cover from the top of sand filter cartridge, carbon filter cartridge and softening cylinder respectively, then electric telescopic link work drives fine hole tray to remove, drives the filter material on the top of fine hole tray to remove, and then conveniently discharges and replaces the filter material that needs to be replaced.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, specifically a multi-stage filtration device for ultrapure water filtration. Background Technology

[0002] Multi-stage filtration equipment for ultrapure water filtration is a system that integrates multiple filtration technologies to gradually purify raw water according to a specific process to obtain high-purity ultrapure water. The raw water first passes through quartz sand filtration, which mainly removes large particulate suspended solids, silt, colloids and other impurities, thus achieving preliminary filtration. Then, activated carbon adsorbs pollutant molecules in the water, further purifying the water quality. Next, ion exchange resin is used to remove hardness ions such as calcium and magnesium in the water, reducing the hardness of the water. Finally, filter cartridges are used as filtration elements to intercept even finer particles, bacteria, colloids and other impurities. It is an important line of defense in multi-stage filtration, providing the required influent conditions for subsequent reverse osmosis treatment.

[0003] Patent document CN219907292U discloses a multi-stage filtration device for ultrapure water production, which includes "an installation platform and an ultrapure water filtration device, wherein the ultrapure water filtration device is mounted on the upper surface of the installation platform, and guide strips are fixedly welded at the four corners of the upper surface of the installation platform. This utility model uses a hydraulic press to drive the casters to move the installation platform downward, which can then move the entire device, saving time and effort. The protective cover can cover and protect the ultrapure water filtration device, preventing the accumulation of external dust and damage from impacts by foreign objects, thus extending the service life of the ultrapure water filtration device and reducing the workload of subsequent maintenance. At the same time, the lifting component can raise and lower the protective cover to expose the ultrapure water filtration device, making it convenient for maintenance personnel. Furthermore, the maintenance component provides convenience for maintenance personnel, improving the efficiency of ultrapure water filtration device maintenance."

[0004] However, the aforementioned multi-stage filtration device for ultrapure water production mainly focuses on improving the efficiency of ultrapure water filtration equipment maintenance, but it is not convenient to drain and replace the internal filter media.

[0005] In view of this, it is necessary to develop a filter media replacement mechanism so that the internal filter media can be easily discharged and replaced. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-stage filtration device for ultrapure water filtration, so as to solve the technical problem mentioned in the background art of enabling the multi-stage filtration device for ultrapure water filtration to have a filter media replacement function.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage filtration device for ultrapure water filtration, comprising: a base plate, a sand filter cartridge, a carbon filter cartridge, a softening cartridge, and a precision filter. The inner walls of the sand filter cartridge, the carbon filter cartridge, and the softening cartridge are all provided with a filter media replacement mechanism, which is used to facilitate the discharge and replacement of the filter media inside.

[0008] The filter media replacement mechanism includes a first flange plate, a second flange plate, and a fine-pore tray. The top of each of the sand filter cartridge, carbon filter cartridge, and softening cartridge is fitted with a first flange plate. The top of the first flange plate has a connecting screw groove. The bottom of the top cover is fitted with a second flange plate. A connecting screw is installed on the outer wall of the second flange plate, and a connecting channel is provided on the inner wall of the second flange plate. One end of the connecting screw is fixed to the inside of the connecting screw groove through the connecting channel. A protective cover is installed on the inner wall of each of the sand filter cartridge, carbon filter cartridge, and softening cartridge. An electric telescopic rod is installed on the inner wall of the protective cover. A fine-pore tray is installed at the output end of the electric telescopic rod. An interlocking groove is provided on the inner wall of the protective cover, and a rubber sealing ring is installed on the inner wall of the interlocking groove.

[0009] Preferably, the sand filter cartridge is located on top of the base plate, the carbon filter cartridge is located on top of the base plate and is located to one side of the sand filter cartridge, the softening cartridge is located on top of the base plate and is located to one side of the carbon filter cartridge, and the precision filter is located on top of the base plate and is located to one side of the softening cartridge. Each of the sand filter cartridge, carbon filter cartridge, softening cartridge, and precision filter is equipped with a top cover. A water delivery pipe is embedded in the inner wall of the top cover. Water delivery pumps are installed on the outer walls of each of the sand filter cartridge, carbon filter cartridge, softening cartridge, and precision filter. The inner wall of the sand filter cartridge is provided with quartz sand, the inner wall of the carbon filter cartridge is provided with activated carbon particles, the inner wall of the softening cartridge is provided with ion exchange resin particles, and the inner wall of the precision filter is equipped with a polypropylene melt-blown filter element.

[0010] Preferably, the top of the protective cover is provided with a protective mechanism, which is used to enhance the waterproof performance of the electric telescopic pole.

[0011] Preferably, the protective mechanism includes a semi-circular protective sleeve and a drainage plate, and the top of the protective cover is provided with two sets of semi-circular protective sleeves, with the semi-circular protective sleeves located above the fitting groove.

[0012] Preferably, the top of the protective cover is provided with an assembly screw groove, the outer wall of the semi-circular protective sleeve is equipped with an assembly plate, the outer wall of the assembly plate is equipped with an assembly screw, and one end of the assembly screw extends into the interior of the assembly screw groove.

[0013] Preferably, a support rod is installed on the top of the semi-circular protective sleeve, and a drainage plate is installed on the top of the support rod.

[0014] Preferably, the water pump has a branch pipe installed at its inlet end, and the inlet end of the branch pipe is located on one side of the protective cover.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model, by installing a filter media replacement mechanism, facilitates the discharge and replacement of the internal filter media. Existing methods cannot conveniently discharge and replace the filter media in sand filter cartridges, carbon filter cartridges, and softening cartridges, so this needs to be improved. First, the connecting screw is removed from the connecting screw groove. Then, the top cover is pulled to move the second flange plate from the first flange plate. The top cover is then moved from the top of the sand filter cartridge, carbon filter cartridge, and softening cartridge respectively. Subsequently, the electric telescopic rod operates to move the fine-pore tray, which in turn moves the filter media above the fine-pore tray, thus facilitating the discharge and replacement of the filter media that needs to be replaced. The protective cover and rubber sealing ring are used to provide waterproof protection for the electric telescopic rod.

[0017] 2. This utility model enhances the waterproof performance of the electric telescopic pole by installing a protective mechanism. Two sets of semi-circular protective sleeves are wrapped around the outside of the output end of the electric telescopic pole, fitting snugly but not affecting the movement of the output end. Then, the assembly screw is fixed into the assembly screw groove, and the two sets of semi-circular protective sleeves are installed above the fitting groove, enhancing the waterproofness of the fitting groove and preventing water from entering the interior of the protective cover. The drainage plate is used to prevent filtered water from accumulating on the top of the protective cover and the semi-circular protective sleeves, thus preventing the water from being absorbed and discharged. The tilt angle of the drainage plate also reduces the contact between the semi-circular protective sleeves and the filtered water, further preventing water from entering the interior of the protective cover. The water inlet of the water pump is located on the right side of the protective cover, while the branch pipe is located on the left side of the protective cover. This prevents water from being unable to be effectively absorbed on the left side of the protective cover during water delivery. The branch pipe is connected to the water inlet pipe of the water pump, thus improving water delivery. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the multi-stage filtration device of this utility model;

[0019] Figure 2 This is a front structural diagram of the multi-stage filtration device of this utility model;

[0020] Figure 3 This is a schematic diagram of the first and second flange plates of this utility model;

[0021] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0022] Figure 5 This is a schematic diagram of the side structure of the branch pipe of this utility model;

[0023] Figure 6 This is a schematic diagram of the front structure of the semi-circular protective sleeve of this utility model.

[0024] In the diagram: 1. Base plate; 2. Sand filter cartridge; 3. Carbon filter cartridge; 4. Softening cartridge; 5. Precision filter; 6. Top cover; 7. Water delivery pipe; 8. Water delivery pump; 9. Quartz sand; 10. Activated carbon granules; 11. Ion exchange resin granules; 12. Polypropylene melt-blown filter element; 13. First flange plate; 14. Connecting screw groove; 15. Second flange plate; 16. Connecting screw; 17. Connecting channel; 18. Protective cover; 19. Electric telescopic rod; 20. Fine-perforated tray; 21. Fitting groove; 22. Rubber sealing ring; 23. Semi-circular protective sleeve; 24. Assembly screw groove; 25. Assembly plate; 26. Support rod; 27. Drainage plate; 28. Branch pipe; 29. ​​Assembly screw. Detailed Implementation

[0025] 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.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Please see Figure 1 and Figure 2A multi-stage filtration device for ultrapure water filtration includes: a base plate 1, a sand filter cartridge 2, a carbon filter cartridge 3, a softening cartridge 4, and a precision filter 5. The sand filter cartridge 2 is located on top of the base plate 1, the carbon filter cartridge 3 is located on top of the base plate 1 and is situated to one side of the sand filter cartridge 2, the softening cartridge 4 is located on top of the base plate 1 and is situated to one side of the carbon filter cartridge 3, and the precision filter 5 is located on top of the base plate 1 and is situated to one side of the softening cartridge 4. A top cover 6 is installed on the top of each of the sand filter cartridge 2, carbon filter cartridge 3, softening cartridge 4, and precision filter 5. A water delivery pipe 7 is embedded in the inner wall of the top cover 6. A water delivery pump 8 is installed on the outer wall of each of the sand filter cartridge 2, carbon filter cartridge 3, softening cartridge 4, and precision filter 5. The inner wall of the filter cartridge 2 is lined with quartz sand 9, the inner wall of the carbon filter cartridge 3 is lined with activated carbon particles 10, the inner wall of the softening cartridge 4 is lined with ion exchange resin particles 11, and the inner wall of the precision filter 5 is equipped with a polypropylene melt-blown filter element 12. The raw water is transported from the top of the sand filter cartridge 2 through an external raw water booster pump and a water delivery pipe 7 on the top cover 6. The particle size distribution of the quartz sand 9 is arranged from coarse to fine in the order from top to bottom. The raw water flows through the quartz sand 9 from top to bottom. The suspended particles, silt, colloids and other impurities in the water are removed under the action of gravity, interception and adsorption. Larger impurity particles are first intercepted by the coarser quartz sand 9 in the upper layer. As the water flows down, the finer particles are further intercepted by the finer quartz sand 9 in the lower layer. Subsequently, the water filtered in the sand filter cartridge 2 is transported to the carbon filter cartridge 3 via the water delivery pipe 7 by the water delivery pump 8. The activated carbon particles 10 are granular and have a rich porous structure. As the water flows through the activated carbon particles 10, the activated carbon particles 10, with their strong adsorption capacity, remove organic matter, residual chlorine, odors, pigments, and other substances from the water. Their adsorption is mainly based on the physical and chemical adsorption characteristics of the activated carbon surface, which can effectively adsorb pollutant molecules in the water. Then, the water filtered in the carbon filter cartridge 3 is transported to the softening cartridge 4 via the water delivery pipe 7 by the water delivery pump 8. The softening cartridge 4 is filled with ion exchange resin particles 11, which are granular and packed with... Inside the container, when water passes through the softening cylinder 4, hardness ions such as calcium and magnesium in the water undergo ion exchange reactions with sodium ions on the resin. Calcium and magnesium ions are adsorbed by the resin, while sodium ions are released into the water, thereby reducing the hardness of the water and achieving the purpose of softening the water. Finally, the water filtered in the softening cylinder 4 is transported to the precision filter 5 through the delivery water pipe 7 by the delivery water pump 8. The water enters from the inlet of the precision filter 5 and is filtered by the polypropylene melt-blown filter element 12. The residual tiny particles, bacteria, colloids and other impurities in the water are intercepted by the filter element, thus obtaining purer water and providing good water intake conditions for subsequent deep treatment such as reverse osmosis.

[0029] Please see Figure 2 , Figure 3 and Figure 4The inner walls of the sand filter cartridge 2, carbon filter cartridge 3, and softening cartridge 4 are all equipped with filter media replacement mechanisms. These mechanisms facilitate the discharge and replacement of the filter media within the cartridges. Each filter media replacement mechanism includes a first flange plate 13, a second flange plate 15, and a fine-perforated tray 20. The top of each of the sand filter cartridge 2, carbon filter cartridge 3, and softening cartridge 4 is fitted with a first flange plate 13, which has a connecting screw groove 14 on its top. The bottom of the top cover 6 is fitted with a second flange plate 15, and the outer wall of the second flange plate 15 is fitted with a connecting screw 16. The inner wall of the second flange plate 15 is provided with a connecting channel 17, and one end of the connecting screw 16 is fixed to the inside of the connecting screw groove 14 through the connecting channel 17. Protective covers 18 are installed on the inner walls of the sand filter cartridge 2, carbon filter cartridge 3, and softening cartridge 4. An electric telescopic rod 19 is installed on the inner wall of the protective cover 18. A fine-hole tray 20 is installed at the output end of the electric telescopic rod 19. The inner wall of the protective cover 18 is provided with a fitting groove 21, and a rubber sealing ring 22 is installed on the inner wall of the fitting groove 21. The protective cover 18 is a stainless steel corrosion-resistant cover. The electric telescopic rod... 19 is a linear telescopic rod with a thrust of 5000N and a stroke of 500mm. Its waterproof rating is IP65 or higher. The fine-pore tray 20 has a pore diameter of 0.5mm, and the size of the filtered material is greater than 0.5mm. The fine-pore tray 20 is used to support the material. The output end of the electric telescopic rod 19 passes through the rubber sealing ring 22 in the fitting groove 21. Existing methods do not allow for convenient discharge and replacement of the filter media in the sand filter cartridge 2, carbon filter cartridge 3, and softening cartridge 4; therefore, improvements are needed. The improvement involves first removing the connecting screw 16 from the connecting screw groove 14, then pulling the top cover 6 to remove the second flange plate 15 from the first flange plate 13, thereby removing the top cover 6 from the top of the sand filter cartridge 2, the carbon filter cartridge 3, and the softening cartridge 4 respectively. Subsequently, the electric telescopic rod 19 operates to move the fine-pore tray 20, which in turn moves the filter media above the fine-pore tray 20, facilitating the discharge and replacement of the filter media that needs to be replaced. The protective cover 18 and the rubber sealing ring 22 are used to provide waterproof protection for the electric telescopic rod 19.

[0030] Please see Figure 3 , Figure 5 and Figure 6The top of the protective cover 18 is equipped with a protective mechanism to enhance the waterproof performance of the electric telescopic rod 19. The protective mechanism includes a semi-circular protective sleeve 23 and a drainage plate 27. The top of the protective cover 18 is provided with two sets of semi-circular protective sleeves 23, and the semi-circular protective sleeves 23 are located above the fitting groove 21. The top of the protective cover 18 is provided with an assembly screw groove 24. An assembly plate 25 is installed on the outer wall of the semi-circular protective sleeve 23, and an assembly screw 29 is installed on the outer wall of the assembly plate 25. One end of the assembly screw 29 extends into the assembly screw groove 24. Inside the 4, a support rod 26 is installed on the top of the semi-circular protective sleeve 23, and a drainage plate 27 is installed on the top of the support rod 26. A branch pipe 28 is installed at the water inlet end of the water pump 8, and the inlet end of the branch pipe 28 is located on one side of the protective cover 18. There are two sets of semi-circular protective sleeves 23, which are made of corrosion-resistant stainless steel. The two sets of semi-circular protective sleeves 23 are installed above the fitting groove 21, and the inner side of the two sets of semi-circular protective sleeves 23 is attached to the rod body of the output end of the electric telescopic rod 19. The assembly screw groove 24 and the assembly screw 29 are both made The anti-corrosion coating is applied, and the drainage plate 27 is inclined at 45°. Two sets of semi-circular protective sleeves 23 are wrapped around the outside of the output end of the electric telescopic rod 19, fitting snugly but not affecting the movement of the output end of the electric telescopic rod 19. Then, the assembly screw 29 is fixed into the assembly screw groove 24, and the two sets of semi-circular protective sleeves 23 are installed above the fitting groove 21 to enhance the waterproofness of the fitting groove 21 and prevent water from entering the interior of the protective cover 18. The drainage plate 27 is used to prevent filtered water from accumulating on the protective cover 18 and the semi-circular protective sleeves. The top of the 23 prevents the water from being absorbed and discharged. The tilt angle of the drainage plate 27 also reduces the contact between the semi-circular protective sleeve 23 and the filtered water, thus further preventing water from entering the interior of the protective cover 18. The water inlet of the water pump 8 is located on the right side of the protective cover 18, while the branch pipe 28 is located on the left side of the protective cover 18. This prevents the water on the left side of the protective cover 18 from not being properly absorbed during water delivery. The branch pipe 28 is connected to the inside of the water inlet pipe of the water pump 8, thus improving the water delivery.

[0031] Working principle: Raw water is pumped by an external raw water booster pump and transported through the water pipe 7 on the top cover 6 to enter from the top of the sand filter cylinder 2. The particle size distribution of the quartz sand 9 is arranged from top to bottom, from coarse to fine. The raw water flows down through the quartz sand 9. Suspended particles, silt, colloids and other impurities in the water are removed by gravity, interception and adsorption. Larger impurity particles are first intercepted by the coarser quartz sand 9 on the upper layer. As the water flows down, finer particles are further intercepted by the finer quartz sand 9 on the lower layer.Subsequently, the water filtered in the sand filter cartridge 2 is transported to the carbon filter cartridge 3 via the water delivery pipe 7 by the water delivery pump 8. The activated carbon particles 10 are granular with a rich porous structure. As the water flows through the activated carbon particles 10, the activated carbon particles 10, with their strong adsorption capacity, remove organic matter, residual chlorine, odors, pigments, and other substances from the water. Their adsorption is mainly based on the physical and chemical adsorption characteristics of the activated carbon surface, which can effectively adsorb pollutant molecules in the water. Then, the water filtered in the carbon filter cartridge 3 is transported to the softening cartridge 4 via the water delivery pipe 7 by the water delivery pump 8. The softening cartridge 4 contains ion exchange resin particles 11, which are granular and filled inside the container. When the water passes through the softening cartridge 4, the calcium, magnesium, and other hardness ions in the water react with the sodium ions on the resin. Ion exchange reactions occur, calcium and magnesium ions are adsorbed by the resin, while sodium ions are released into the water, thereby reducing water hardness and achieving water softening. Finally, the water filtered in the softening cartridge 4 is transported to the precision filter 5 via the delivery water pump 8 and the delivery water pipe 7. Water enters from the inlet of the precision filter 5 and is filtered by the polypropylene melt-blown filter element 12. Residual microparticles, bacteria, colloids, and other impurities in the water are trapped by the filter element, resulting in purer water. This provides good inlet conditions for subsequent deep treatments such as reverse osmosis. However, the existing system does not allow for convenient removal and replacement of the filter media in the sand filter cartridge 2, carbon filter cartridge 3, and softening cartridge 4. Therefore, improvements are needed. First, the connecting screw 16 is removed from the connecting screw groove 14. Pulling the top cover 6 removes the second flange plate 15 from the first flange plate 13, allowing the top cover 6 to be removed from the tops of the sand filter cartridge 2, carbon filter cartridge 3, and softening cartridge 4 respectively. The electric telescopic rod 19 then moves the fine-pore tray 20, causing the filter media above it to move, facilitating the removal and replacement of the filter media that needs to be replaced. The protective cover 18 and rubber sealing ring 22 provide waterproof protection for the electric telescopic rod 19. Two sets of semi-circular protective sleeves 23 are wrapped around the outside of the output end of the electric telescopic rod 19, fitting snugly but not affecting the movement of the output end. The assembly screw 29 is then fixed into the assembly screw groove 24, installing the two sets of semi-circular protective sleeves 23 into the fitting groove. Above 21, the waterproofing of the fitting groove 21 is enhanced to prevent water from entering the interior of the protective cover 18. The drainage plate 27 is used to prevent filtered water from accumulating on the top of the protective cover 18 and the semi-circular protective sleeve 23, which would prevent it from being absorbed and discharged. The tilt angle of the drainage plate 27 can also reduce the contact between the semi-circular protective sleeve 23 and the filtered water, thus further preventing water from entering the interior of the protective cover 18. The water inlet of the water pump 8 is located on the right side of the protective cover 18, while the branch pipe 28 is located on the left side of the protective cover 18. This prevents water from being poorly absorbed on the left side of the protective cover 18 during water delivery. The branch pipe 28 is connected to the water inlet pipe of the water pump 8, thus improving water delivery.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-stage filtration device for ultrapure water filtration, characterized in that, Includes: a base plate (1), a sand filter cartridge (2), a carbon filter cartridge (3), a softening cartridge (4), and a precision filter (5). The inner walls of the sand filter cartridge (2), the carbon filter cartridge (3), and the softening cartridge (4) are all equipped with a filter media replacement mechanism, which is used to facilitate the discharge and replacement of the filter media inside. The filter media replacement mechanism includes a first flange plate (13), a second flange plate (15), and a fine-pore tray (20). The top of the sand filter cartridge (2), the carbon filter cartridge (3), and the softening cartridge (4) are all equipped with the first flange plate (13). The top of the first flange plate (13) is provided with a connecting screw groove (14). The bottom of the top cover (6) is equipped with the second flange plate (15). The outer wall of the second flange plate (15) is equipped with a connecting screw (16), and the inner wall of the second flange plate (15) is provided with a connecting channel (17). One end of the connecting screw (16) is fixed to the inside of the connecting screw groove (14) through the connecting channel (17). The inner walls of the sand filter cylinder (2), carbon filter cylinder (3) and softening cylinder (4) are equipped with protective covers (18). The inner walls of the protective covers (18) are equipped with electric telescopic rods (19). The output end of the electric telescopic rods (19) is equipped with a fine-hole tray (20). The inner walls of the protective covers (18) are provided with fitting grooves (21). The inner walls of the fitting grooves (21) are equipped with rubber sealing rings (22).

2. The multi-stage filtration device for ultrapure water filtration according to claim 1, characterized in that: The sand filter cartridge (2) is located on top of the base plate (1), the carbon filter cartridge (3) is located on top of the base plate (1) and is located on one side of the sand filter cartridge (2), the softening cartridge (4) is located on top of the base plate (1) and is located on one side of the carbon filter cartridge (3), and the precision filter (5) is located on top of the base plate (1) and is located on one side of the softening cartridge (4). The tops of the sand filter cartridge (2), the carbon filter cartridge (3), the softening cartridge (4) and the precision filter (5) are all equipped with The top cover (6) is inlaid with a water delivery pipe (7). The outer walls of the sand filter (2), carbon filter (3), softening cylinder (4) and precision filter (5) are all equipped with water delivery pumps (8). The inner wall of the sand filter (2) is provided with quartz sand (9). The inner wall of the carbon filter (3) is provided with activated carbon particles (10). The inner wall of the softening cylinder (4) is provided with ion exchange resin particles (11). The inner wall of the precision filter (5) is equipped with a polypropylene melt-blown filter element (12).

3. A multi-stage filtration device for ultrapure water filtration according to claim 1, characterized in that: The top of the protective cover (18) is provided with a protective mechanism, which is used to enhance the waterproof performance of the electric telescopic rod (19).

4. A multi-stage filtration device for ultrapure water filtration according to claim 3, characterized in that: The protective mechanism includes a semi-circular protective sleeve (23) and a drainage plate (27). The top of the protective cover (18) is provided with two sets of semi-circular protective sleeves (23), and the semi-circular protective sleeves (23) are located above the fitting groove (21).

5. A multi-stage filtration device for ultrapure water filtration according to claim 4, characterized in that: The top of the protective cover (18) is provided with an assembly screw groove (24), the outer wall of the semi-circular protective sleeve (23) is equipped with an assembly plate (25), the outer wall of the assembly plate (25) is equipped with an assembly screw (29), and one end of the assembly screw (29) extends into the interior of the assembly screw groove (24).

6. A multi-stage filtration device for ultrapure water filtration according to claim 5, characterized in that: The top of the semi-circular protective sleeve (23) is equipped with a support rod (26), and the top of the support rod (26) is equipped with a drainage plate (27).

7. A multi-stage filtration device for ultrapure water filtration according to claim 2, characterized in that: The water pump (8) is equipped with a branch pipe (28) at its inlet end, and the inlet end of the branch pipe (28) is located on one side of the protective cover (18).

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