Multi-stage composite self-cleaning filter element

By designing a multi-stage composite self-cleaning filter element, the problems of poor self-cleaning effect due to fixed inlet position and difficulty in opening the integral structure are solved, achieving a self-cleaning effect with multi-position rinsing and convenient operation.

CN224100150UActive Publication Date: 2026-04-10HUNAN HONGRUN WATER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-08
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The existing filter cartridges have a fixed inlet position during the self-cleaning process, resulting in poor self-cleaning effect, and the one-piece structure makes it difficult to open the interior.

Method used

The multi-stage composite self-cleaning filter cartridge is designed, including a second protective ring, a cleaning and filtration component, a first positioning component, and a convenient opening component. By changing the position of the water inlet and the convenient opening structure, the self-cleaning effect is improved and the internal operation is convenient.

Benefits of technology

The self-cleaning effect of the filter element has been improved, allowing for rinsing in multiple locations and easy access to the internal structure, thus reducing the difficulty of operation.

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Abstract

The utility model relates to the field of water purification, in particular to a multi-stage composite self-cleaning filter element. Comprising a second protection ring, a purifying and filtering assembly is fixedly installed at the top of the second protection ring, a first positioning assembly is fixedly installed at the bottom of the purifying and filtering assembly, and a first limiting assembly is fixedly installed on the outer side face of the purifying and filtering assembly; a convenient opening assembly is fixedly installed on the outer side face of the purifying and filtering assembly, second positioning assemblies are fixedly installed on one side of the convenient opening assembly and the outer side face of the purifying and filtering assembly, and second limiting assemblies are fixedly installed at one end of the convenient opening assembly and the outer side face of the purifying and filtering assembly; the technical problems that the self-cleaning effect is poor and the interior is inconvenient to open are solved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to water purification field especially relates to a multistage composite self-cleaning filter element. BACKGROUND

[0002] In the water purification field, when purifying water, a filter element is used, and in the process of purifying water, a multistage composite self-cleaning filter element is often needed to achieve efficient water purification.

[0003] In the prior art, after the filter element is used to purify water and is disassembled, when the filter element needs to be self-cleaned by adding water from the water inlet and discharging water from the water outlet, since the position of the water inlet of the filter element is generally fixed, the filter element can only be washed inside at a fixed position by adding water, which makes the filter element unable to be washed inside at other positions by adding water, reduces the self-cleaning effect of the filter element, and in the prior art, after the filter element is used to purify water and is disassembled, when the filter element needs to be opened, since the filter element is generally integral, the side of the filter element is difficult to open, which increases the difficulty of opening the inside of the filter element. SUMMARY

[0004] The utility model provides a multistage composite self-cleaning filter element to solve the problems of poor self-cleaning effect and inconvenient opening of the inside in the prior art, can improve the self-cleaning effect, and facilitate opening of the inside.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a multistage composite self-cleaning filter element, comprising a second protective ring, the top of the second protective ring is fixedly installed with a filter water and improves the self-cleaning effect of the clear filter assembly, the bottom of the clear filter assembly is fixedly installed with the first positioning assembly that positions the clear filter assembly, the outer side of the clear filter assembly is fixedly installed with the first limiting assembly that limits the clear filter assembly;The outer side of the clear filter assembly is fixedly installed with the convenient opening assembly that facilitates opening of the inside of the clear filter assembly, the outer side of the clear filter assembly and the outer side of the clear filter assembly are fixedly installed with the second positioning assembly that positions the convenient opening assembly on one side of the convenient opening assembly, the outer side of the clear filter assembly and the outer side of the clear filter assembly are fixedly installed with the second limiting assembly that limits the convenient opening assembly on one end of the convenient opening assembly.

[0006] Further, the filter assembly comprises a multi-stage composite self-cleaning filter core body, the bottom of the multi-stage composite self-cleaning filter core body is fixedly installed on the top of the second protective ring, an inner incomplete annular plate is movably installed in the core body of the multi-stage composite self-cleaning filter core body, the inner bottom wall of the multi-stage composite self-cleaning filter core body is fixedly connected with a first filter layer, a second filter layer and a third filter layer respectively, a water outlet hole is formed in the bottom end of the core body of the multi-stage composite self-cleaning filter core body, a second sealing plug is threadedly connected in the water outlet hole, an annular end cover is rotatably connected to the top of the multi-stage composite self-cleaning filter core body, the top of the annular end cover is fixedly connected with a first protective ring, a water inlet hole is formed in the annular end cover, and a first sealing plug is threadedly connected in the water inlet hole.

[0007] Further, the first positioning assembly comprises a connecting ring, the top of the connecting ring is fixedly installed on the bottom of the annular end cover, the inner side of the connecting ring is fixedly connected with a second positioning ring, the outer side of the connecting ring is fixedly connected with a first positioning ring, and the connecting ring, the second positioning ring and the first positioning ring are all rotatably installed in the core body of the multi-stage composite self-cleaning filter core body.

[0008] Further, the first limiting assembly comprises a supporting ring and a limiting block, the inner side of the supporting ring is fixedly installed on the outer side of the multi-stage composite self-cleaning filter core body, one side of the limiting block is fixedly installed on the outer side of the annular end cover, the supporting ring is rotatably connected with the limiting block, a plurality of first threaded grooves are formed in the top of the supporting ring, and a first screw rod is threadedly connected in the limiting block.

[0009] Further, the easy-to-open assembly comprises an outer incomplete annular plate, the inner side of the outer incomplete annular plate is fixedly installed on the outer side of the outer incomplete annular plate, and the outer side of the outer incomplete annular plate is fixedly connected with an incomplete annular rod.

[0010] Further, the second positioning assembly comprises a positioning long plate and a positioning long rod, one side of the positioning long plate is fixedly installed on one side of the outer incomplete annular plate, one side of the positioning long rod is fixedly installed on the outer side of the multi-stage composite self-cleaning filter core body, and the positioning long plate is movably installed in the positioning long rod.

[0011] Further, the second limiting assembly comprises a first limiting long rod and a second limiting long rod, one side of the first limiting long rod is fixedly installed on one end of the incomplete annular rod, one side of the second limiting long rod is fixedly installed on the outer side of the multi-stage composite self-cleaning filter core body, a second screw rod is threadedly connected in the second limiting long rod, and the second screw rod is threadedly connected with the first limiting long rod.

[0012] The utility model discloses a working principle and use principle lie in: in the process of using the device, through the setting of second protection ring, clear filter component, first positioning component and first limiting component, make the device can purify water, after using the device to purify water, and after the device is disassembled, when the device needs to be cleaned by the mode of adding water from the water inlet and discharging water from the drain, make the position of the water inlet of the device can change, make the device can avoid reducing the self -cleaning effect because of being unable to flush the inside of the device at other positions by adding water, make the device can improve the self -cleaning effect, and in the process of using the device, through the setting of convenient opening component, second positioning component and second limiting component, after using the device to purify water, and after the device is disassembled, when the device needs to open the inside, make the side of the device can open, make the device can avoid increasing the difficulty of opening the inside because of the side being unable to open, make the device can conveniently open the inside.

[0013] The utility model discloses the beneficial technical effects are:

[0014] Through the setting of second protection ring, clear filter component, first positioning component and first limiting component, make the device can purify water, after using the device to purify water, and after the device is disassembled, when the device needs to be cleaned by the mode of adding water from the water inlet and discharging water from the drain, make the position of the water inlet of the device can change, make the device can flush the inside of the device at other positions by adding water, make the device can improve the self -cleaning effect, and through the setting of convenient opening component, second positioning component and second limiting component, after using the device to purify water, and after the device is disassembled, when the device needs to open the inside, make the side of the device can open, make the device can easily open the inside, make the device can conveniently open the inside. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the front view stereogram schematic drawing of the utility model;

[0016] Figure 2 It is the connecting ring stereogram schematic drawing of the utility model;

[0017] Figure 3 It is the rear view stereogram schematic drawing of the utility model;

[0018] Figure 4 It is the outer incomplete annular plate stereogram schematic drawing of the utility model;

[0019] Figure 5 It is the front view cross section schematic drawing of the utility model.

[0020] Explanation of reference signs: 1, first protective ring; 2, annular end cover; 3, first screw rod; 4, limiting block; 5, second protective ring; 6, multi-stage composite self-cleaning filter core main body; 7, positioning long rod; 8, second screw rod; 9, second limiting long rod; 10, first limiting long rod; 11, incomplete annular rod; 12, outer incomplete annular plate; 13, first threaded groove; 14, support ring; 15, first sealing plug; 16, third filter layer; 17, second filter layer; 18, first filter layer; 19, positioning long plate; 20, connecting ring; 21, first positioning ring; 22, second sealing plug; 23, second positioning ring; 24, inner incomplete annular plate; 25, water inlet hole; 26, water outlet hole. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects realized by the embodiments of the present application easy to understand, the embodiments of the present application are further described below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present application and do not limit the embodiments of the present application.

[0022] Embodiment one: as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown: a multi-stage composite self-cleaning filter element, including a second protective ring 5, a multi-stage composite self-cleaning filter element main body 6, a connecting ring 20, a supporting ring 14 and a limiting block 4, the top of the second protective ring 5 is fixedly installed with a filter water and improves the self-cleaning effect of the clear filter assembly, the clear filter assembly includes a multi-stage composite self-cleaning filter element main body 6, the bottom of the multi-stage composite self-cleaning filter element main body 6 is fixedly installed on the top of the second protective ring 5, the inner core of the multi-stage composite self-cleaning filter element main body 6 is movably installed with an inner incomplete annular plate 24, the inner bottom wall of the multi-stage composite self-cleaning filter element main body 6 is fixedly connected with a first filter layer 18, a second filter layer 17 and a third filter layer 16 respectively, the bottom end of the multi-stage composite self-cleaning filter element main body 6 is provided with a water outlet hole 26 in the inner core, the inside of the water outlet hole 26 is threadedly connected with a second sealing plug 22, the top of the multi-stage composite self-cleaning filter element main body 6 is rotatably connected with an annular end cover 2, the top of the annular end cover 2 is fixedly connected with a first protective ring 1, the inside of the annular end cover 2 is provided with a water inlet hole 25, the inside of the water inlet hole 25 is threadedly connected with a first sealing plug 15, the bottom of the clear filter assembly is fixedly installed with a first positioning assembly for positioning the clear filter assembly, the first positioning assembly includes a connecting ring 20, the top of the connecting ring 20 is fixedly installed on the bottom of the annular end cover 2, the inner side of the connecting ring 20 is fixedly connected with a second positioning ring 23, the outer side of the connecting ring 20 is fixedly connected with a first positioning ring 21, the connecting ring 20, the second positioning ring 23 and the first positioning ring 21 are all rotatably installed in the inner core of the multi-stage composite self-cleaning filter element main body 6, the outer side of the clear filter assembly is fixedly installed with a first limiting assembly for limiting the clear filter assembly, the first limiting assembly includes a supporting ring 14 and a limiting block 4, the inner side of the supporting ring 14 is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body 6, one side of the limiting block 4 is fixedly installed on the outer side of the annular end cover 2, the supporting ring 14 is rotatably connected with the limiting block 4, the top of the supporting ring 14 is provided with a plurality of first threaded grooves 13 respectively, the inside of the limiting block 4 is threadedly connected with a first screw rod 3, the first screw rod 3 is threadedly connected with the first threaded grooves 13, through the setting of the second protective ring 5, the clear filter assembly, the first positioning assembly and the first limiting assembly, the clear filter assembly can filter water and improve the self-cleaning effect, the first positioning assembly can position the clear filter assembly, the first limiting assembly can limit the clear filter assembly, the device can purify water, after using the device to purify water, and after the device is disassembled, when the device needs to be self-cleaned by adding water from the water inlet and discharging water from the water outlet, the position of the water inlet of the device can be changed, the device can avoid reducing the self-cleaning effect due to the inability to flush the inside of the device at other positions by adding water, the device can improve the self-cleaning effect.

[0023] In use, the initial state of the device is: the first plug 15 is connected with the water inlet hole 25 by screw thread, the second plug 22 is connected with the water outlet hole 26 by screw thread, the first screw rod 3 is connected with the first threaded groove 13 by screw thread, and the second screw rod 8 is connected with the first limiting long rod 10 by screw thread. When the device needs to be used to purify water, it is fixedly installed in the internal part of the water purification equipment. After installation, under the action of the multi-stage composite self-cleaning filter element main body 6, the first filter layer 18, the second filter layer 17 and the third filter layer 16, the water can be filtered. At this time, the device can be used to purify water.

[0024] After the device is used to purify water and is disassembled, when the device needs to be self-cleaned by adding water from the water inlet and discharging water from the water outlet, the first plug 15 is rotated to disconnect the first plug 15 from the water inlet hole 25, so that the water inlet hole 25 is opened. The second plug 22 is rotated to disconnect the second plug 22 from the water outlet hole 26, so that the water outlet hole 26 is opened. Water is added to the inside of the multi-stage composite self-cleaning filter element main body 6 along the water inlet hole 25. Under the action of gravity, the water in the outer incomplete annular plate 12 flows out along the inside of the water outlet hole 26. Under the action of water entering from the water inlet hole 25 and flowing out from the water outlet hole 26, the first filter layer 18, the second filter layer 17 and the third filter layer 16 can be washed, and the multi-stage composite self-cleaning filter element main body 6 can be self-cleaned by adding water from the water inlet hole 25 and discharging water from the water outlet hole 26. At this time, the device can be used to be self-cleaned by adding water from the water inlet and discharging water from the water outlet.

[0025] When the device needs to be self-cleaned by adding water from the water inlet and discharging water from the water outlet, the first screw rod 3 is rotated to disconnect the first screw rod 3 from the first threaded groove 13 and to locate one end of the first screw rod 3 in the limiting block 4. The first protective ring 1 is rotated to rotate the annular end cover 2 along the multi-stage composite self-cleaning filter element main body 6. The connecting ring 20, the first positioning ring 21 and the second positioning ring 23 are all rotated along the inside of the core of the multi-stage composite self-cleaning filter element main body 6. The limiting block 4 is rotated along the supporting ring 14. The position of the water inlet hole 25 can be changed. When the position of the water inlet hole 25 is the required position and when the first screw rod 3 corresponds to the first threaded groove 13, the first screw rod 3 is reversely rotated to connect the first screw rod 3 with the first threaded groove 13 by screw thread. At this time, under the action that the position of the water inlet hole 25 can be changed, the water inlet hole 25 can be added water at other positions to clean the inside of the multi-stage composite self-cleaning filter element main body 6, so that the multi-stage composite self-cleaning filter element main body 6 can improve the self-cleaning effect.

[0026] In summary, the device can purify water. After purifying water by using the device, and after the device is disassembled, when the device needs to be self-cleaned by adding water from the water inlet and discharging water from the water outlet, the position of the water inlet of the device can be changed, so that the device can avoid reducing the self-cleaning effect due to the inability to flush the inside of the device at other positions, and improve the self-cleaning effect.

[0027] Embodiment two: as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 : a multi-stage composite self-cleaning filter element, comprising an outer incomplete annular plate 12, a positioning long plate 19, a positioning long rod 7, a first limiting long rod 10 and a second limiting long rod 9, the outer side of the clear filtering assembly is fixedly installed with a convenient opening assembly for conveniently opening the inside of the clear filtering assembly. The outer side of the outer incomplete annular plate 12 is fixedly installed on the outer side of the outer incomplete annular plate 12. The outer side of the outer incomplete annular plate 12 is fixedly connected with an incomplete annular rod 11. One side of the convenient opening assembly and the outer side of the clear filtering assembly are both fixedly installed with a second positioning assembly for positioning the convenient opening assembly. The second positioning assembly comprises a positioning long plate 19 and a positioning long rod 7. One side of the positioning long plate 19 is fixedly installed on one side of the outer incomplete annular plate 12. One side of the positioning long rod 7 is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body 6. The positioning long plate 19 is movably installed in the inside of the positioning long rod 7. One end of the convenient opening assembly and the outer side of the clear filtering assembly are both fixedly installed with a second limiting assembly for limiting the convenient opening assembly. The second limiting assembly comprises a first limiting long rod 10 and a second limiting long rod 9. One side of the first limiting long rod 10 is fixedly installed on one end of the incomplete annular rod 11. One side of the second limiting long rod 9 is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body 6. The inside of the second limiting long rod 9 is threadedly connected with a second screw rod 8. The second screw rod 8 is threadedly connected with the first limiting long rod 10. Through the arrangement of the convenient opening assembly, the second positioning assembly and the second limiting assembly, the convenient opening assembly can conveniently open the inside of the clear filtering assembly. The second positioning assembly can position the convenient opening assembly. The second limiting assembly can limit the convenient opening assembly. After purifying water by using the device, and after the device is disassembled, when the device needs to be opened, the side of the device can be opened, so that the device can avoid increasing the difficulty of opening the inside due to the inability to open the side, and can conveniently open the inside.

[0028] In use, after the water is purified by the device and after the device is disassembled, when the device needs to be opened, the second screw 8 is rotated to disengage the second screw 8 from the first limiting rod 10 and to have one end of the second screw 8 inside the second limiting rod 9. The incomplete annular rod 11 is pulled to disengage the first limiting rod 10 from the second limiting rod 9, and the outer incomplete annular plate 12 is disengaged from the multi-stage composite self-cleaning filter element main body 6, the supporting ring 14 and the positioning rod 7. The positioning plate 19 is slid out of the inside of the positioning rod 7, and the inner incomplete annular plate 24 is slid out of the inside of the multi-stage composite self-cleaning filter element main body 6. When the inner incomplete annular plate 24 is completely slid out of the inside of the multi-stage composite self-cleaning filter element main body 6, the positioning plate 19 is completely slid out of the inside of the positioning rod 7, and the side of the multi-stage composite self-cleaning filter element main body 6 is opened. At this time, the device can be opened.

[0029] When the device is opened, the side of the multi-stage composite self-cleaning filter element main body 6 can be easily opened, and the multi-stage composite self-cleaning filter element main body 6 can be easily opened.

[0030] In summary, after the water is purified by the device and after the device is disassembled, when the device needs to be opened, the side of the device can be opened, which can avoid increasing the difficulty of opening the inside of the device, and the inside of the device can be easily opened.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalent alternatives. The modifications or replacements do not change the essence of the corresponding technical solutions, and do not deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-stage composite self-cleaning filter element comprising a second guard ring (5), characterized in that: The top of the second protective ring (5) is fixedly installed with a filter water and improve the self-cleaning effect of the filter assembly, the bottom of the filter assembly is fixedly installed with a first positioning assembly for positioning the filter assembly, and the outer side of the filter assembly is fixedly installed with a first limiting assembly for limiting the filter assembly.

2. The multi-stage composite self-cleaning filter element according to claim 1, characterized in that: The filter assembly comprises a multi-stage composite self-cleaning filter core body (6), the bottom of the multi-stage composite self-cleaning filter core body (6) is fixedly installed on the top of the second protective ring (5), the inner core body of the multi-stage composite self-cleaning filter core body (6) is movably installed with an inner incomplete annular plate (24), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the bottom end of the multi-stage composite self-cleaning filter core body (6) is provided with a water outlet hole (26), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the top of the multi-stage composite self-cleaning filter core body (6) is rotatably connected with an annular end cover (2), the top of the annular end cover (2) is fixedly connected with a first protective ring (1), the inner bottom wall of the multi-stage composite self-cleaning filter core body (6) is fixedly connected with a first filter layer (18), a second filter layer (17) and a third filter layer (16) respectively, the inner bottom wall of the multi-stage composite 3. The multi-stage composite self-cleaning filter element according to claim 1 or 2, characterized in that: ​ 4. The multi-stage composite self-cleaning filter element of claim 3, wherein: ​ 5. The multi-stage composite self-cleaning filter element according to claim 1, 2 or 4, characterized in that: ​ 6. The multi-stage composite self-cleaning filter element of claim 3, wherein: ​ 7. The multi-stage composite self-cleaning filter element according to claim 1, 2, 4 or 6, characterized in that: The second positioning assembly comprises a positioning long plate (19) and a positioning long rod (7), one side of the positioning long plate (19) is fixedly installed on one side of the outer incomplete annular plate (12), one side of the positioning long rod (7) is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body (6), and the positioning long plate (19) is movably installed in the positioning long rod (7).

8. The multi-stage composite self-cleaning filter element of claim 5, wherein: The second positioning assembly comprises a positioning long plate (19) and a positioning long rod (7), one side of the positioning long plate (19) is fixedly installed on one side of the outer incomplete annular plate (12), one side of the positioning long rod (7) is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body (6), and the positioning long plate (19) is movably installed in the positioning long rod (7).

9. The multi-stage composite self-cleaning filter element of claim 1, 2, 4, 6 or 8, wherein: The second limiting assembly comprises a first limiting long rod (10) and a second limiting long rod (9), one side of the first limiting long rod (10) is fixedly installed on one end of the incomplete annular rod (11), one side of the second limiting long rod (9) is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body (6), the second limiting long rod (9) is internally threadedly connected with a second screw rod (8), and the second screw rod (8) is threadedly connected with the first limiting long rod (10).

10. The multi-stage composite self-cleaning filter element of claim 7, wherein: The second limiting assembly comprises a first limiting long rod (10) and a second limiting long rod (9), one side of the first limiting long rod (10) is fixedly installed on one end of the incomplete annular rod (11), one side of the second limiting long rod (9) is fixedly installed on the outer side of the multi-stage composite self-cleaning filter element main body (6), the second limiting long rod (9) is internally threadedly connected with a second screw rod (8), and the second screw rod (8) is threadedly connected with the first limiting long rod (10).