Multi-stage filtration fine filtration device

Abstract

The utility model relates to the technical field of water multistage filtering devices, and discloses a multistage filtering fine filtering device which comprises a water inlet, a cotton piece filtering mechanism, a connecting pipe, an activated carbon filtering mechanism and a water outlet mechanism, the cotton piece filtering mechanism comprises a square pipe, and the activated carbon filtering mechanism comprises two first honeycomb pieces. The water outlet mechanism comprises a water outlet pipe and two return pipes; the rear end of the square pipe is fixedly arranged at the center of the front end of the water inlet in a penetrating mode, and the front end of the square pipe is fixedly arranged at the center of the rear end of the connecting pipe in a penetrating mode. According to the device disclosed by the utility model, convenient installation and replacement are realized through the cotton piece filtering mechanism which is modularly designed, the subsequent activated carbon filtering mechanism is protected by adopting a progressive filtering structure, a filter element is more convenient to replace due to a single-pipe rotating design in the activated carbon filtering mechanism, and the filtering efficiency is improved due to a central symmetry layout; two return pipes are arranged to realize water flow circulating filtration, and a built-in TDS monitoring device is used for keeping the water quality purity.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage water filtering devices, in particular to a multi-stage fine filtering device. Background Art

[0002] Pure water filtration device is a kind of efficient water treatment equipment, which mainly removes impurities such as mud, rust, colloids and suspended matter in water, removes soluble solids, inorganic salts and organic matter in water, ensures high purity of produced water, and meets the water needs of chemical, pharmaceutical, experimental analysis and other industries. Pure water filtration device has the characteristics of high efficiency, energy saving, stability and reliability, and is widely used in electronics, semiconductors, precision machinery, food and beverage, pharmaceutical and other industries. In the electronics and semiconductor industries, pure water is used to manufacture chips, integrated circuits and optoelectronic devices. In the food and beverage industry, pure water is used to produce drinking water, beverages and beer. In the pharmaceutical industry, pure water is used for pharmaceuticals, preparations and medical equipment cleaning. With the advancement of science and technology and the continuous improvement of people's requirements for water quality, pure water filtration devices play an important role in more fields.

[0003] After searching, the existing patent (publication number: CN221846305U) discloses a "water treatment filter device, including an upper shell, an arc-shaped cover plate, an upper shell joint, a lower shell, a lower shell joint, an upper filter cartridge, a lower filter cartridge, a large-mesh filter screen, a small-mesh filter screen, an arc-shaped pressure block, and a spring. The upper shell side has a semicircular opening, the outer side of the upper shell is connected to the arc-shaped cover plate, the arc-shaped cover plate corresponds to the semicircular opening, the upper part of the spring is connected to the upper shell, a group of springs are distributed in the upper shell, the upper filter cartridge is adapted to the upper shell, the upper filter cartridge is inserted into the upper shell, the upper filter cartridge slides up and down in the upper shell, the lower part of the spring abuts against the upper part of the upper filter cartridge, the lower part of the upper filter cartridge has a small-mesh filter screen, a group of small-mesh filter screens are distributed in the lower part of the upper filter cartridge, the upper part of the upper filter cartridge has an upper filter cartridge upper tube, the upper part of the upper shell has an upper shell joint, the upper filter cartridge upper tube is adapted to the upper shell joint, the upper filter cartridge upper tube is inserted into the upper shell joint, and the upper filter cartridge upper tube slides in the upper shell joint."

[0004] During the development of this application, the inventors discovered the following problems with the prior art: While the aforementioned comparative patent provides a water treatment and filtration device comprising an upper housing, an arc-shaped cover plate, an upper housing joint, a lower housing, a lower housing joint, an upper filter cartridge, a lower filter cartridge, a large-mesh filter screen, a small-mesh filter screen, an arc-shaped pressure block, and a spring, the device requires shutting off the water valve to remove and clean the filter screen, resulting in a significant interruption in the filtration process. Therefore, those skilled in the art have proposed a multi-stage fine filtration device to address the problems identified in the aforementioned background art. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a multi-stage filtration fine filtration device. The device realizes convenient installation and replacement through a modularly designed cotton sheet filter mechanism, adopts a progressive filtration structure to protect the subsequent activated carbon filter mechanism, the single-tube rotating design in the activated carbon filter mechanism makes filter element replacement more convenient, the central symmetrical layout improves the filtration efficiency, two return pipes are provided to realize water circulation filtration, and a built-in TDS monitoring device ensures water purity.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a multi-stage filtration fine filtration device, comprising a water inlet, a cotton sheet filter mechanism, a connecting pipe, an activated carbon filter mechanism and a water outlet mechanism, wherein the cotton sheet filter mechanism comprises a square tube, the activated carbon filter mechanism comprises two first honeycomb sheets, and the water outlet mechanism comprises a water outlet pipe and two return pipes;

[0007] The rear end of the square tube is fixedly set to the front end center of the water inlet, the front end of the square tube is fixedly set to the rear end center of the connecting pipe, the front end of the connecting pipe is fixedly set to the rear end of the rear one of the two first honeycomb sheets, and the front end of the front one of the two first honeycomb sheets is fixedly set to the rear end of the water outlet pipe.

[0008] Furthermore, a first slot is provided at the front and rear positions of the upper end of the square tube, and three second slots are evenly provided from front to back at a position between the two first slots. Baffles are slidably provided in the two first slots, and insert plates are slidably provided inside the three second slots.

[0009] Furthermore, the three plug plates are each provided with a square hole through the center of the front and rear ends, and corrugated cotton sheets are fixedly installed in the three square holes. The three corrugated cotton sheets are all made of polypropylene melt-blown cotton and have thicknesses of five microns, one micron and one micron from the back to the front respectively.

[0010] Furthermore, a rotating shaft is fixedly provided at the center of the front end of the rear end and the center of the rear end of the front end of the two first honeycomb sheets, and a second honeycomb sheet is rotatably provided on the shaft bodies of the two rotating shafts near the positions of the two first honeycomb sheets, and six single tubes are fixedly provided in a centrally symmetrical manner on the front end of the rear end and the rear end of the two second honeycomb sheets, and a third honeycomb sheet is fixedly provided on the front ends of the six single tubes at the rear and the rear ends of the six single tubes at the front, and the two rotating shafts are rotatably provided through the shaft bodies away from the positions of the two second honeycomb sheets to the centers of the two third honeycomb sheets, and a five-hole tube is fixedly provided between the two third honeycomb sheets.

[0011] Furthermore, fixed blocks are fixedly provided on both sides of the upper ends of the two first honeycomb sheets in an axially symmetrical manner, and fixing grooves are provided at the middle positions of the two front ends at the rear and the middle positions of the two rear ends at the front of the four fixed blocks. Fixing rods are fixed at the rear positions of the six single-tube bodies at the rear and the front positions of the six single-tube bodies at the front, and four of the multiple fixing rods close to the four fixed blocks are respectively clamped into the middle positions inside the four fixing grooves.

[0012] Furthermore, the front ends of the two return pipes are respectively fixedly arranged at the rear positions on both sides of the water outlet pipe body, and the rear ends of the two return pipes are respectively fixedly arranged at the front positions on both sides of the water inlet.

[0013] Furthermore, a one-way valve is fixedly installed through the position between the two return pipe bodies and the water inlet, and a solenoid valve is fixedly installed through the water outlet pipe body at a position in front of the two return pipes.

[0014] Furthermore, granular activated carbon filter elements are slidably installed in the six single tubes at the rear, and precision compressed activated carbon filter elements are slidably installed in the six single tubes at the front.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model proposes a multi-stage filtration fine filtration device, which realizes a modular design by arranging two first slots and three second slots in the cotton sheet filter mechanism, making the installation and replacement of the plug plate fixed with the corrugated cotton sheet more convenient. The user only needs to slide the two baffles downward in the two first slots to cut off the water flow, and then unplug and replace the plug plate according to actual conditions without shutting down the water valve, thereby fully improving maintenance efficiency, being simple and quick, and reducing maintenance time and cost. The three corrugated cotton sheets in the cotton sheet filter mechanism adopt a progressive filtration design, with thicknesses of five microns, one micron and one micron from the back to the front, respectively, gradually removing impurities in the water. This multi-stage filtration structure not only effectively removes impurities in the water, but also better protects the subsequent activated carbon filter mechanism and extends its service life.

[0017] 2. The utility model proposes a multi-stage fine filtration device. The rotating shaft design in the activated carbon filter mechanism of the device enables multiple single tubes to rotate around the rotating shaft, thereby conveniently replacing the internal activated carbon filter element. The clamping arrangement of the fixing rod and the fixing groove ensures that it can be rotated sixty degrees each time, so that the upper single tube can replace the activated carbon filter element inside it, providing a stable and convenient mechanism for maintenance and replacement of the filter element, reducing maintenance time and cost. The multiple single tubes in the activated carbon filter mechanism are arranged in a centrally symmetrical layout, which helps to evenly distribute the water flow, improve the filtration efficiency, reduce the dead water area, and ensure the full and effective utilization of the activated carbon filter element. The five-hole tube is fixedly set between the two third honeycomb sheets, and the groove design at its upper end provides sufficient space for replacing the activated carbon filter element.

[0018] 3. The utility model proposes a multi-stage filtration fine filtration device, which realizes circulating filtration of water flow by setting two return pipes, thereby improving filtration efficiency and water purity. The outlet pipe is located behind the solenoid valve and is equipped with a TDS monitoring device. When the monitoring value is greater than the set value, the solenoid valve remains closed, and the insufficiently filtered water returns to the water inlet through the two return pipes for re-filtration, ensuring that impurities in the water are fully removed until the set TDS value is met. Fixed one-way valves are installed on the two return pipes to ensure that water can only flow in one direction, preventing unfiltered water from directly flowing into the outlet pipe, thereby ensuring the purity of the outlet water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an axonometric diagram of the present utility model;

[0020] Figure 2 This is a schematic diagram of the present invention when viewed from the rear end;

[0021] Figure 3 This is an axonometric diagram of the cotton sheet filter mechanism of the present invention;

[0022] Figure 4 This is an axonometric side sectional diagram of the cotton sheet filter mechanism of the present invention;

[0023] Figure 5 This is an axonometric diagram of the connecting pipe and activated carbon filter mechanism of the present invention;

[0024] Figure 6 This is an axonometric side sectional diagram of the connecting pipe and the activated carbon filter mechanism of the present invention;

[0025] Figure 7 This is an isometric front cross-sectional diagram of the connecting pipe and the activated carbon filter mechanism of the present invention;

[0026] Figure 8 For the utility model Figure 6 A magnified schematic diagram of the structure at point A.

[0027] Legend:

[0028] 1. Water inlet; 2. Cotton sheet filter mechanism; 3. Connecting pipe; 4. Activated carbon filter mechanism; 5. Water outlet mechanism; 201. Square tube; 202. First slot; 203. Second slot; 204. Baffle; 205. Insert plate; 206. Corrugated cotton sheet; 401. First honeycomb sheet; 402. Fixed block; 403. Fixed slot; 404. Second honeycomb sheet; 405. Rotating shaft; 406. Single tube; 407. Fixed rod; 408. Five-hole tube; 409. Third honeycomb sheet; 501. Water outlet pipe; 502. Solenoid valve; 503. Return pipe; 504. One-way valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Reference Figure 1 and Figure 2 The utility model provides an embodiment of a multi-stage filtration fine filtration device, comprising a water inlet 1, a cotton sheet filter mechanism 2, a connecting pipe 3, an activated carbon filter mechanism 4 and a water outlet mechanism 5, wherein the cotton sheet filter mechanism 2 comprises a square tube 201, the activated carbon filter mechanism 4 comprises two first honeycomb sheets 401, and the water outlet mechanism 5 comprises a water outlet pipe 501 and two return pipes 503;

[0031] The rear end of the square tube 201 is fixedly set to the center of the front end of the water inlet 1, and the front end of the square tube 201 is fixedly set to the center of the rear end of the connecting pipe 3. The front end of the connecting pipe 3 is fixedly set to the rear end of the rear one of the two first honeycomb sheets 401, and the front end of the front one of the two first honeycomb sheets 401 is fixedly set to the rear end of the water outlet pipe 501.

[0032] Specifically, the square tube 201 in the cotton sheet filter mechanism 2 provides a good installation position for the water inlet 1 and the connecting pipe 3, the connecting pipe 3 provides a good installation position for the rear one of the two first honeycomb sheets 401 in the activated carbon filter mechanism 4, and the water outlet pipe 501 in the water outlet mechanism 5 provides a good installation position for the front one of the two first honeycomb sheets 401 in the activated carbon filter mechanism 4.

[0033] Reference Figure 2 、 Figure 3 and Figure 4: A first slot 202 is provided at the front and rear ends of the square tube 201. Three second slots 203 are evenly provided on the square tube 201 between the two first slots 202 from front to back. Baffles 204 are slidably provided in the two first slots 202. Inserts 205 are slidably provided inside the three second slots 203. The three inserts 205 are all provided with square holes through the centers of the front and rear ends. Corrugated cotton sheets 206 are fixedly provided in the three square holes. The three corrugated cotton sheets 206 are all made of polypropylene melt-blown cotton and have thicknesses of five microns, one micron, and one micron from back to front, respectively.

[0034] Specifically, by providing two first slots 202 and three second slots 203, the cotton sheet filter mechanism 2 is modularized, making the installation and replacement of the plug plate 205 fixed with the corrugated cotton sheet 206 more convenient, and fully improving the maintenance efficiency. When in use, when replacing the corrugated cotton sheet 206 according to actual needs, the two baffles 204 are slid downward in the two first slots 202 to cut off the water flow, and then the plug plate 205 is replaced according to actual conditions without shutting down the water valve, which is simple and quick.

[0035] The multi-stage filtering structure formed by the corrugated cotton sheet 206 fixed in the center of the insert plate 205 slidingly arranged in the three second slots 203 gradually removes impurities in the water. The thickness of the three corrugated cotton sheets 206 are five microns, one micron and one micron from the back to the front, respectively, forming a progressive filtration, which more effectively protects the subsequent activated carbon filter mechanism 4 and extends its service life. The corrugated cotton sheet 206 made of polypropylene melt-blown cotton not only has good filtering performance but also has relatively low cost, which helps to reduce the production cost of the entire fine filtration device.

[0036] Reference Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 : A rotating shaft 405 is fixedly provided at the center of the front end of the rear end and the center of the rear end of the front end of the two first honeycomb sheets 401. The second honeycomb sheets 404 are rotatably provided on the two rotating shafts 405. Six single tubes 406 are fixedly provided at the front end and the rear end of the two second honeycomb sheets 404 in a centrally symmetrical manner. A third honeycomb sheet 409 is fixedly provided at the front ends of the six rear single tubes 406 and the rear ends of the six front single tubes 406. The two rotating shafts 405 are rotatably provided at the centers of the two third honeycomb sheets 409 away from the two second honeycomb sheets 404. A five-hole tube 408 is fixedly provided between the two third honeycomb sheets 409.

[0037] Fixed blocks 402 are fixedly provided on both sides of the upper ends of the two first honeycomb sheets 401 in an axially symmetrical manner. Fixed grooves 403 are provided in the middle positions of the two front ends at the rear and the middle positions of the two rear ends at the front of the four fixed blocks 402. Fixed rods 407 are fixedly provided at the rear positions of the six single tubes 406 at the rear and at the front positions of the six single tubes 406 at the front. Four of the multiple fixing rods 407 close to the four fixed blocks 402 are respectively snap-fitted into the middle positions inside the four fixing grooves 403. Granular activated carbon filter elements are slidably provided in the six single tubes 406 at the rear, and precision compressed activated carbon filter elements are slidably provided in the six single tubes 406 at the front.

[0038] Specifically, the multiple single tubes 406 are arranged in a centrally symmetrical manner, which helps to evenly distribute the water flow, improve the filtration efficiency, reduce the dead water area, and ensure the full and effective utilization of the activated carbon filter element. When the granular activated carbon filter element or the precision compressed activated carbon filter element needs to be replaced, it is only necessary to turn the single tubes 406 in turn to rotate them around the rotation axis 405. Then, the fixing rods 407 fixed to the tube body of the single tube 406 pass through the fixing blocks 402 in turn and are clamped into the fixing grooves 403. The end of the single tube 406 at the upper end, which is close to the first honeycomb sheet 401, is aligned with the unopened position of the first honeycomb sheet 401, thereby cutting off the water flow entering the single tube 406. The end of the single tube 406 at the upper end, which is close to the five-hole tube 408, is aligned with the groove at the upper end of the five-hole tube 408, so that the activated carbon filter element inside it can be easily taken out and replaced.

[0039] The snap-fit ​​arrangement of the fixing rod 407 and the fixing groove 403 ensures that a single tube 406 can be rotated sixty degrees each time to replace the activated carbon filter element inside it, providing a stable and convenient mechanism for maintaining and replacing filter elements, making it easier to replace granular activated carbon filter elements and precision compressed activated carbon filter elements, reducing maintenance time and cost. Granular activated carbon filter elements are arranged in the six rear single tubes 406, and precision compressed activated carbon filter elements are arranged in the six front single tubes 406, forming a double-layer activated carbon filtration, which effectively removes residual chlorine, organic matter, odor and pigment in the water and improves water quality. The five-hole tube 408 is fixedly arranged between the two third honeycomb sheets 409, and the groove design at its upper end provides sufficient space for replacing the activated carbon filter element. The activated carbon filtration mechanism 4 not only improves the filtration effect through double-layer activated carbon filtration, but also improves the overall performance and service life of the entire fine filtration device by optimizing water flow distribution.

[0040] Reference Figure 2: The front ends of the two return pipes 503 are respectively fixed to the rear positions on both sides of the water outlet pipe 501, and the rear ends of the two return pipes 503 are respectively fixed to the front positions on both sides of the water inlet 1. A one-way valve 504 is fixedly installed between the two return pipes 503 and the water inlet 1, and a solenoid valve 502 is fixedly installed on the water outlet pipe 501 in front of the two return pipes 503;

[0041] Specifically, by setting up two return pipes 503, circulating filtration of water flow is achieved, and the filtration efficiency and water purity are improved. The outlet pipe 501 is located behind the solenoid valve 502 and has a built-in TDS monitoring device. When the monitoring value is greater than the set value, the solenoid valve 502 remains closed, and the insufficiently filtered water returns to the water inlet 1 through the two return pipes 503 for re-filtration, ensuring that impurities in the water are fully removed until the set TDS value is met. Two fixed one-way valves 504 are passed through the two return pipes 503 to ensure that water can only flow in one direction, preventing unfiltered water from directly flowing into the outlet pipe 501, thereby avoiding the mixing of filtered water and unfiltered water and ensuring the purity of the outlet water.

[0042] Working principle: When in use, according to actual needs, when replacing the corrugated cotton sheet 206, the two baffles 204 are slid downward in the two first slots 202 to cut off the water flow, and then the replacement plug 205 is pulled out and plugged in according to actual conditions, without shutting down the water valve, which is simple and quick. When the granular activated carbon filter element or the precision compressed activated carbon filter element needs to be replaced, it is only necessary to turn the single tube 406 in turn to rotate it around the rotating shaft 405, and the fixing rod 407 fixed on the tube body of the single tube 406 passes through the fixing block 402 in turn and is clamped into the fixing groove 403. The end of the single tube 406 at the upper end, which is close to the first honeycomb sheet 401, is aligned with the unopened position of the first honeycomb sheet 401, thereby cutting off the water flow entering the single tube 406, and the end of the single tube 406 at the upper end, which is close to the five-hole tube 408, is aligned with the groove at the upper end of the five-hole tube 408, so that the activated carbon filter element inside it can be easily taken out and replaced.

[0043] Secondly, the snap-fit ​​arrangement of the fixing rod 407 and the fixing groove 403 ensures that the activated carbon filter element inside a single tube 406 can be replaced each time by rotating sixty degrees, providing a stable and convenient mechanism for maintaining and replacing filter elements, making the replacement of granular activated carbon filter elements and precision compressed activated carbon filter elements easier, reducing maintenance time and cost. In addition, by providing two return pipes 503, water circulation filtration is achieved, improving filtration efficiency and water purity. The outlet pipe 501 is located behind the solenoid valve 502 and has a built-in TDS monitoring device. When the monitoring value is greater than the set value, the solenoid valve 502 remains closed, and the insufficiently filtered water returns to the water inlet 1 through the two return pipes 503 for re-filtration, ensuring that impurities in the water are fully removed until the set TDS value is met. Two fixed one-way valves 504 passing through the two return pipes 503 ensure that water can only flow in one direction, preventing unfiltered water from directly flowing into the outlet pipe 501, thereby avoiding the mixing of filtered water and unfiltered water and ensuring the purity of the outlet water.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage fine filtration device, comprising a water inlet (1), a cotton sheet filter mechanism (2), a connecting pipe (3), an activated carbon filter mechanism (4) and a water outlet mechanism (5), characterized in that: The cotton sheet filter mechanism (2) includes a square tube (201), the activated carbon filter mechanism (4) includes two first honeycomb sheets (401), and the water outlet mechanism (5) includes a water outlet pipe (501) and two return pipes (503); The rear end of the square tube (201) is fixedly arranged at the front center of the water inlet (1), the front end of the square tube (201) is fixedly arranged at the rear center of the connecting tube (3), the front end of the connecting tube (3) is fixedly arranged at the rear end of the rear one of the two first honeycomb sheets (401), and the front end of the front one of the two first honeycomb sheets (401) is fixedly arranged at the rear end of the water outlet pipe (501).

2. A multi-stage filtration fine filtration device according to claim 1, characterized in that: The square tube (201) is provided with a first slot (202) at the front and rear positions of the upper end, and the square tube (201) is provided with three second slots (203) evenly spaced from front to rear at a position between the two first slots (202). Baffles (204) are slidably provided in the two first slots (202), and inserting plates (205) are slidably provided in the three second slots (203).

3. The multi-stage filtration fine filtration device according to claim 2, characterized in that: The three inserting plates (205) are all provided with a square hole through the center of the front and rear ends, and the three square holes are all fixedly provided with a corrugated cotton sheet (206). The three corrugated cotton sheets (206) are all made of polypropylene melt-blown cotton and have thicknesses of five microns, one micron, and one micron from the back to the front, respectively.

4. The multi-stage filtration fine filtration device according to claim 1, characterized in that: A rotation shaft (405) is fixedly provided at the center of the front end of the rear end and the center of the rear end of the front end of the two first honeycomb sheets (401); a second honeycomb sheet (404) is rotatably provided on the shaft bodies of the two rotation shafts (405) near the positions of the two first honeycomb sheets (401); six single tubes (406) are fixedly provided at the front end of the rear end and the rear end of the front end of the two second honeycomb sheets (404) in a centrally symmetrical manner; a third honeycomb sheet (409) is fixedly provided at the front ends of the six rear end single tubes (406) and the rear ends of the six front end single tubes (406); the shaft bodies of the two rotation shafts (405) are respectively rotatably provided through the centers of the two third honeycomb sheets (409) at positions away from the two second honeycomb sheets (404); a five-hole tube (408) is fixedly provided between the two third honeycomb sheets (409).

5. The multi-stage fine filtration device according to claim 4, characterized in that: Fixed blocks (402) are fixedly provided at both sides of the upper ends of the two first honeycomb sheets (401) in an axially symmetrical manner. Fixed grooves (403) are provided at the middle positions of the two front ends at the rear and the middle positions of the two rear ends at the front of the four fixed blocks (402). Fixed rods (407) are fixed at the rear positions of the six single tubes (406) at the rear and at the front positions of the six single tubes (406) at the front. Four of the multiple fixed rods (407) close to the four fixed blocks (402) are respectively clamped and provided at the middle positions inside the four fixed grooves (403).

6. The multi-stage filtration fine filtration device according to claim 1, characterized in that: The front ends of the two return pipes (503) are respectively fixedly arranged at the rear positions on both sides of the water outlet pipe (501), and the rear ends of the two return pipes (503) are respectively fixedly arranged at the front positions on both sides of the water inlet (1).

7. The multi-stage fine filtration device according to claim 6, characterized in that: A one-way valve (504) is fixedly provided between the two return pipes (503) and the water inlet (1), and a solenoid valve (502) is fixedly provided through the water outlet pipe (501) at a position in front of the two return pipes (503).

8. The multi-stage fine filtration device according to claim 4, characterized in that: Granular activated carbon filter elements are slidably disposed in the six rear single tubes (406), and precision compressed activated carbon filter elements are slidably disposed in the six front single tubes (406).

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