Multi-stage filtering type filter

Abstract

The utility model belongs to the technical field of water treatment equipment, and particularly relates to a multi-stage filtering type filter which comprises a filtering shell, a filtering cavity is formed in the filtering shell, a plurality of fixing strips are symmetrically and fixedly installed in the filtering cavity, and two sliding rods are installed in the filtering cavity and located on one sides of the fixing strips in a sliding mode. A plurality of sliding strips are fixedly installed between every two adjacent sliding rods. The two fixing assemblies are both located in the filtering shell and used for fixing the positions of the multiple sliding strips; the four sliding frames are symmetrically installed in the filtering cavity in an inserted mode, one side of each sliding frame penetrates through the filtering cavity and extends to the outside, filtering nets are fixedly installed in the sliding frames, power cavities are symmetrically formed in the filtering shell, limiting blocks are symmetrically installed in the power cavities in a sliding mode, and the four limiting blocks are located on one sides of the four sliding frames correspondingly; when the whole device is used, a worker can conveniently replace the two filter screens on the left side, and water filtration is not affected in the replacement process.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment equipment, and in particular relates to a multi-stage filtering filter. Background Art

[0002] The filter is an indispensable device on the medium conveying pipeline. It is usually installed on the pressure reducing valve, pressure relief valve, and water level valve to facilitate the inlet equipment of other filter equipment. The filter consists of a cylinder, a stainless steel filter screen, a sewage discharge part, a transmission device and an electrical control part. After the water to be treated passes through the filter cartridge of the filter screen, its impurities are blocked.

[0003] For example, Chinese patent publication number CN213555769U discloses a water filter comprising a filter box, wherein a support column is fixedly mounted on the bottom of the inner cavity of the filter box, and a support plate is fixedly mounted on the top of the support column, a limit ring is provided on the top of the support plate, a filter element is fixedly mounted inside the limit ring, the filter element passes through the limit ring, and a first flange is provided on the top of the filter element. The utility model provides a filter box for preventing liquid leakage during the filtration process, a support plate for installing and limiting the filter element, a limit ring for limiting the filter element, a filter element for filtering water, and a first flange for connecting the filter element to the filter bucket to prevent liquid leakage from the connection between the filter element and the filter bucket. At the same time, the utility model solves the problems of existing water filters such as being very inconvenient when replacing the filter element, the cumbersome replacement steps, and the easy damage to the filter element during the replacement process, which cannot meet the use requirements.

[0004] The above patent has the following problems:

[0005] This patent has some disadvantages when used. For example, when replacing the filter screen, the device needs to stop filtering to replace the filter screen, which affects the water filtration speed and reduces the working efficiency of the entire device. In view of this, we propose a multi-stage filtration filter. Utility Model Content

[0006] The purpose of the present invention is to provide a multi-stage filtering filter to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a multi-stage filtering filter, comprising:

[0008] A filter housing is provided with a filter cavity, a plurality of fixed bars are symmetrically fixedly installed in the filter cavity, two sliding rods are slidably installed in the filter cavity and on one side of the fixed bar, and a plurality of sliding bars are fixedly installed between two adjacent sliding rods;

[0009] Two fixing assemblies, both of which are located in the filter housing and are used to fix the positions of the plurality of sliding bars;

[0010] Four sliding frames, the four sliding frames are symmetrically plugged into the filter cavity, one side of the sliding frame passes through the filter cavity and extends to the outside, a filter screen is fixedly installed in the sliding frame, a power cavity is symmetrically opened in the filter housing, and a limit block is symmetrically slidably installed in the power cavity, the four limit blocks are respectively located on one side of the four sliding frames, one side of the limit block extends into the corresponding sliding frame, and the limit block is plugged into the corresponding sliding frame;

[0011] Two driving assemblies are both located in the filter housing and are used to drive the four limiting blocks to slide respectively.

[0012] In this technical solution, when water needs to be filtered, the water is filtered by four filter screens, and the impurities in the water stay on the top of the four filter screens;

[0013] When the two filters on the left need to be taken out for cleaning, a person can pull the fixed column on the left to slide outward through the fixed assembly provided, and the fixed column on the left drives the several sliding bars on the left and the two sliding rods to slide outward. When the several sliding bars on the left are staggered with the several fixed bars on the left, water cannot flow downward through the several fixed bars on the left, and water can only flow downward through the several fixed bars on the right. The fixed assembly provided fixes the positions of the several sliding bars on the left, making it convenient for people to replace the two filters on the left, and the replacement process does not affect water filtration.

[0014] Through the set driving assembly, the two limit blocks on the left can be driven to slide and approach each other. When the two limit blocks are detached from the corresponding sliding frames, the personnel can pull the two handles on the left, and the two handles respectively drive the two sliding frames to slide outward. At this time, the personnel can clean the impurities on the top of the two filter screens on the left. By reversing the above operation, the positions of the two sliding frames can be fixed, which is convenient for cleaning impurities on the top of the filter screen. At the same time, it will not affect water filtration during the disassembly and installation process.

[0015] In the above technical solution, further, the fixing assembly includes:

[0016] A fixed column, the fixed column is fixedly installed on one side of one of the sliding rods, the fixed column is slidably connected to the filter chamber, a sliding groove is provided in the fixed column, a limit column is slidably installed in the sliding groove, one side of the limit column passes through the sliding groove and extends into the filter chamber, and one side of the limit column is plugged into the filter chamber, the upper end of the limit column passes through the sliding groove and extends to the outside, and the other side of the limit column is fixedly installed with a plurality of springs fixed to the inner wall of the sliding groove.

[0017] Then the personnel releases the limiting column, and under the action of the rebound force of the springs, the limiting column slides in the direction away from the spring, and then one side of the limiting column contacts the outside of the filter housing. At this time, the position of the fixing column is fixed, which further fixes the positions of the sliding bars on the left, making it convenient for personnel to replace the two filters on the left, and the replacement process does not affect water filtration.

[0018] In the above technical solution, further, the driving component includes:

[0019] A threaded rod, the threaded rod is threadedly installed in the power chamber, and a sliding block is rotatably installed on one end of the threaded rod, and two connecting rods are rotatably installed on one end of the sliding block. The two connecting rods are rotatably connected to the two limit blocks respectively, and the other end of the threaded rod passes through the power chamber and extends to the outside world. The sliding block is slidably connected to the power chamber, and the two connecting rods are both rotatably connected to the power chamber.

[0020] In this technical solution, the personnel rotates the threaded rod on the left, and under the action of the thread, the threaded rod moves to the left, and then the sliding block pulls the two connecting rods to rotate, and the two connecting rods respectively drive the two limit blocks to slide and approach each other. When the two limit blocks are disengaged from the corresponding sliding frames, the personnel can pull the two sliding frames on the left to slide outward. At this time, the personnel can clean the impurities on the top of the two filter screens on the left. By reversing the above operation, the positions of the two sliding frames can be fixed, which is convenient for cleaning impurities on the top of the filter screen. At the same time, it will not affect water filtration during the disassembly and installation process.

[0021] In the above technical solution, further, an operating panel is fixedly mounted on the other end of the threaded rod, and a handle is fixedly mounted on one side of the sliding frame.

[0022] In this technical solution, the provided operating panel facilitates personnel to rotate the threaded rod, and the provided handle facilitates personnel to pull the sliding frame.

[0023] In the above technical solution, further, the plurality of fixed bars are in close contact with the plurality of sliding bars respectively.

[0024] In this technical solution, it is ensured that when the plurality of fixed bars and the plurality of sliding bars are staggered, water cannot flow downward through the plurality of fixed bars.

[0025] In the above technical solution, further, a water inlet pipe is fixedly installed on the top of the filter shell, and two water outlet pipes are fixedly installed on the bottom of the filter shell, and the water inlet pipe and the two water outlet pipes are both connected to the filter cavity.

[0026] In this technical solution, the water inlet pipe is provided to facilitate water to enter the filter cavity through the water inlet pipe, and the two water outlet pipes are provided to ensure that water can be discharged through the two water outlet pipes after filtration is completed.

[0027] In the above technical solution, further, the filtering accuracy of the two filter screens located above is smaller than the filtering accuracy of the two filter screens located below.

[0028] In this technical solution, it is ensured that large particles of impurities will stay on the top of the two upper filters, and that small particles of impurities will stay on the top of the two lower filters. Multi-stage filtration can ensure that the filters will not be frequently clogged.

[0029] The beneficial effects of the utility model are:

[0030] When the two filters on the left side of the multi-stage filter need to be taken out for cleaning, the operator can pull the fixed column on the left side to slide outward through the fixed component, and the fixed column on the left side drives the several sliding bars and the two sliding rods on the left side to slide outward. When the several sliding bars on the left side are staggered with the several fixed bars on the left side, water cannot flow downward through the several fixed bars on the left side, and water can only flow downward through the several fixed bars on the right side. The fixed component is provided, which fixes the positions of the several sliding bars on the left side, making it convenient for the operator to replace the two filters on the left side, and the replacement process does not affect the water filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0032] Figure 2 This is one of the schematic diagrams of the cross-sectional structure of the filter housing of the present utility model;

[0033] Figure 3 This is the second schematic diagram of the cross-sectional structure of the filter housing of the present invention;

[0034] Figure 4 This is the third schematic diagram of the cross-sectional structure of the filter housing of the present invention;

[0035] Figure 5 This is a schematic diagram of the cross-sectional structure of the fixed column of the utility model;

[0036] Figure 6 This is the fourth schematic diagram of the cross-sectional structure of the filter housing of the present invention.

[0037] The marks in the figure are:

[0038] 1. Filter housing; 2. Filter chamber; 3. Fixed bar; 4. Sliding bar; 5. Sliding rod; 6. Fixed column; 7. Sliding frame; 8. Filter screen; 9. Water inlet pipe; 10. Water outlet pipe; 11. Sliding groove; 12. Limiting column; 13. Spring; 14. Threaded rod; 15. Sliding block; 16. Connecting rod; 17. Power chamber; 18. Handle; 19. Operating panel; 20. Limiting block. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of this application.

[0040] In the description of this application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0041] It should be noted that the terms "first," "second," etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and that the objects distinguished by "first," "second," etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0042] It should be noted that, in the description of this application, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional terms do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional terms "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0043] It should be noted that, in the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0044] Example 1:

[0045] See also Figure 1 - Figure 6 As shown, this embodiment provides a multi-stage filtering filter, comprising:

[0046] A filter housing 1 is provided with a filter chamber 2, a plurality of fixed bars 3 are symmetrically fixedly installed in the filter chamber 2, two sliding rods 5 are slidably installed in the filter chamber 2 and on one side of the fixed bar 3, and a plurality of sliding bars 4 are fixedly installed between two adjacent sliding rods 5;

[0047] Two fixing components, both of which are located in the filter housing 1 and are used to fix the positions of the plurality of sliding bars 4;

[0048] Four sliding frames 7 are symmetrically inserted and installed in the filter chamber 2. One side of the sliding frame 7 passes through the filter chamber 2 and extends to the outside. A filter screen 8 is fixedly installed in the sliding frame 7. A power chamber 17 is symmetrically opened in the filter housing 1. A limit block 20 is symmetrically slidably installed in the power chamber 17. The four limit blocks 20 are respectively located on one side of the four sliding frames 7. One side of the limit block 20 extends into the corresponding sliding frame 7, and the limit block 20 is inserted and matched with the corresponding sliding frame 7;

[0049] Two driving assemblies are both located in the filter housing 1 and are used to drive the four limiting blocks 20 to slide respectively.

[0050] When water needs to be filtered, the water is filtered by the four filter screens 8, and the impurities in the water stay on the top of the four filter screens 8;

[0051] When the two filters 8 on the left need to be taken out for cleaning, the personnel can pull the left fixing post 6 to slide outward through the provided fixing assembly, and the left fixing post 6 drives the left plurality of sliding bars 4 and the two sliding rods 5 to slide outward. When the left plurality of sliding bars 4 are staggered with the left plurality of fixing bars 3, water cannot flow downward through the left plurality of fixing bars 3, and water can only flow downward through the right plurality of fixing bars 3. The provided fixing assembly fixes the positions of the left plurality of sliding bars 4, making it convenient for personnel to replace the two filters 8 on the left, and the replacement process does not affect water filtration.

[0052] By means of the provided driving assembly, the two limit blocks 20 on the left can be driven to slide and approach each other. When the two limit blocks 20 are disengaged from the corresponding sliding frames 7, personnel can pull the two handles 18 on the left, and the two handles 18 respectively drive the two sliding frames 7 to slide outward. At this time, personnel can clean the impurities on the top of the two filter screens 8 on the left. By reversing the above operation, the positions of the two sliding frames 7 can be fixed, which is convenient for cleaning the impurities on the top of the filter screen 8. At the same time, the water filtration will not be affected during the disassembly and installation process.

[0053] In this embodiment, the fixing component includes:

[0054] A fixed column 6 is fixedly mounted on one side of one of the sliding rods 5. The fixed column 6 is slidably connected to the filter chamber 2. A sliding groove 11 is provided in the fixed column 6. A limiting column 12 is slidably installed in the sliding groove 11. One side of the limiting column 12 passes through the sliding groove 11 and extends into the filter chamber 2. One side of the limiting column 12 is plugged into the filter chamber 2. The upper end of the limiting column 12 passes through the sliding groove 11 and extends to the outside. The other side of the limiting column 12 is fixedly mounted with a plurality of springs 13 fixed to the inner wall of the sliding groove 11.

[0055] When the filter screen 8 on the left side needs to be taken out for cleaning, the limiting post 12 on the left side is first pulled to slide in the direction of the spring 13 on the left side, and then one side of the limiting post 12 is disengaged from the filter chamber 2. At the same time, the springs 13 on the left side are squeezed and contracted. Then the personnel pulls the fixing post 6 on the left side to slide outward, and the fixing post 6 on the left side drives the sliding bars 4 on the left side and the two sliding rods 5 to slide outward. When the sliding bars 4 on the left side are staggered with the fixing bars 3 on the left side, water cannot flow downward through the fixing bars 3 on the left side, and water can only flow downward through the fixing bars 3 on the right side. Then the personnel releases the limiting post 12, and under the action of the rebound force of the springs 13, the limiting post 12 slides in the direction away from the spring 13, and then one side of the limiting post 12 contacts the outer side of the filter housing 1. At this time, the position of the fixing post 6 is fixed, further fixing the positions of the sliding bars 4 on the left side, making it convenient for personnel to replace the two filter screens 8 on the left side, and the replacement process does not affect water filtration.

[0056] In this embodiment, the driving component includes:

[0057] A threaded rod 14 is threadedly mounted in the power chamber 17, and a sliding block 15 is rotatably mounted on one end of the threaded rod 14. Two connecting rods 16 are rotatably mounted on one end of the sliding block 15. The two connecting rods 16 are rotatably connected to the two limit blocks 20 respectively. The other end of the threaded rod 14 passes through the power chamber 17 and extends to the outside. The sliding block 15 is slidably connected to the power chamber 17, and the two connecting rods 16 are both rotatably connected to the power chamber 17.

[0058] Among them, the personnel rotates the threaded rod 14 on the left, and under the action of the thread, the threaded rod 14 moves to the left, and then the sliding block 15 pulls the two connecting rods 16 to rotate, and the two connecting rods 16 respectively drive the two limit blocks 20 to slide and approach each other. When the two limit blocks 20 are disengaged from the corresponding sliding frames 7, the personnel can pull the two sliding frames 7 on the left to slide outward. At this time, the personnel can clean the impurities on the top of the two filter screens 8 on the left. By reversing the above operation, the positions of the two sliding frames 7 can be fixed, which is convenient for cleaning the impurities on the top of the filter screen 8. At the same time, it will not affect water filtration during the disassembly and installation process.

[0059] Example 2:

[0060] This embodiment provides a multi-stage filtration filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0061] In this embodiment, an operating panel 19 is fixedly mounted on the other end of the threaded rod 14 , and a handle 18 is fixedly mounted on one side of the sliding frame 7 .

[0062] The operating panel 19 is provided to facilitate personnel to rotate the threaded rod 14 , and the handle 18 is provided to facilitate personnel to pull the sliding frame 7 .

[0063] Example 3:

[0064] This embodiment provides a multi-stage filtration filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0065] In this embodiment, the plurality of fixed bars 3 are in close contact with the plurality of sliding bars 4 respectively.

[0066] Here, it is ensured that when the plurality of fixed bars 3 and the plurality of sliding bars 4 are staggered, water cannot flow downward through the plurality of fixed bars 3 .

[0067] Example 4:

[0068] This embodiment provides a multi-stage filtration filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0069] In this embodiment, a water inlet pipe 9 is fixedly installed on the top of the filter housing 1 , and two water outlet pipes 10 are fixedly installed on the bottom of the filter housing 1 . The water inlet pipe 9 and the two water outlet pipes 10 are both connected to the filter chamber 2 .

[0070] Among them, the water inlet pipe 9 is provided to facilitate water to enter the filter chamber 2 through the water inlet pipe 9, and the two water outlet pipes 10 are provided to ensure that water can be discharged through the two water outlet pipes 10 after the filtration is completed.

[0071] Example 5:

[0072] This embodiment provides a multi-stage filtration filter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0073] In this embodiment, the filtering accuracy of the two upper filter screens 8 is lower than the filtering accuracy of the two lower filter screens 8 .

[0074] Among them, it is ensured that large particles of impurities will stay on the top of the two upper filter screens 8, and that small particles of impurities will stay on the top of the two lower filter screens 8. Multi-stage filtration can ensure that the filter screens 8 will not be frequently clogged.

[0075] Working principle: When water needs to be filtered, first the water enters the filter chamber 2 from the water inlet pipe 9, then the water is filtered by the four filter screens 8, while the impurities in the water remain on the top of the four filter screens 8, and finally the clean water is discharged from the filter chamber 2 through the two outlet pipes 10;

[0076] When the filter screens 8 on the left side need to be taken out for cleaning, the limiting post 12 on the left side is first pulled to slide in the direction of the spring 13 on the left side, and then one side of the limiting post 12 is disengaged from the filter chamber 2, and at the same time, the springs 13 on the left side are squeezed and contracted. Then the personnel pulls the left fixing post 6 to slide outward, and the fixing post 6 on the left side drives the sliding bars 4 on the left side and the two sliding rods 5 to slide outward. When the sliding bars 4 on the left side are staggered with the fixing bars 3 on the left side, water cannot flow downward through the fixing bars 3 on the left side, and water can only flow downward through the fixing bars 3 on the right side.

[0077] The personnel turns the operating disk 19 on the left and drives the threaded rod 14 to rotate. Under the action of the thread, the threaded rod 14 moves to the left, and then the sliding block 15 pulls the two connecting rods 16 to rotate. The two connecting rods 16 respectively drive the two limit blocks 20 to slide and approach each other. When the two limit blocks 20 are disengaged from the corresponding sliding frames 7, the personnel can pull the two handles 18 on the left, and the two handles 18 respectively drive the two sliding frames 7 to slide outward. At this time, the personnel can clean the impurities on the top of the two filter screens 8 on the left. By reversing the above operation, the position of the two sliding frames 7 can be fixed, which is convenient for cleaning the impurities on the top of the filter screen 8. At the same time, it will not affect water filtration during the disassembly and installation process.

[0078] The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A multi-stage filter, characterized in that: include: A filter housing (1) is provided with a filter cavity (2) in the filter housing (1), a plurality of fixing bars (3) are symmetrically fixedly installed in the filter cavity (2), two sliding rods (5) are slidably installed in the filter cavity (2) and on one side of the fixing bar (3), and a plurality of sliding bars (4) are fixedly installed between two adjacent sliding rods (5); Two fixing assemblies, both of which are located in the filter housing (1) and are used to fix the positions of the plurality of sliding bars (4); Four sliding frames (7), the four sliding frames (7) are symmetrically plugged and installed in the filter cavity (2), one side of the sliding frame (7) passes through the filter cavity (2) and extends to the outside, a filter screen (8) is fixedly installed in the sliding frame (7), a power cavity (17) is symmetrically opened in the filter housing (1), and a limit block (20) is symmetrically slidably installed in the power cavity (17), the four limit blocks (20) are respectively located on one side of the four sliding frames (7), one side of the limit block (20) extends into the corresponding sliding frame (7), and the limit block (20) is plugged and matched with the corresponding sliding frame (7); Two driving assemblies are located in the filter housing (1) and are respectively used to drive the four limiting blocks (20) to slide.

2. A multi-stage filter according to claim 1, characterized in that: The fixing assembly includes: A fixed column (6), wherein the fixed column (6) is fixedly mounted on one side of one of the sliding rods (5), the fixed column (6) is slidably connected to the filter chamber (2), a sliding groove (11) is provided in the fixed column (6), a limiting column (12) is slidably mounted in the sliding groove (11), one side of the limiting column (12) passes through the sliding groove (11) and extends into the filter chamber (2), and one side of the limiting column (12) is plugged into the filter chamber (2), the upper end of the limiting column (12) passes through the sliding groove (11) and extends to the outside, and the other side of the limiting column (12) is fixedly mounted with a plurality of springs (13) fixed to the inner wall of the sliding groove (11).

3. A multi-stage filter according to claim 2, characterized in that: The drive assembly includes: A threaded rod (14) is threadedly installed in a power chamber (17), and a sliding block (15) is rotatably installed on one end of the threaded rod (14), and two connecting rods (16) are rotatably installed on one end of the sliding block (15), and the two connecting rods (16) are respectively rotatably connected to two limit blocks (20), and the other end of the threaded rod (14) passes through the power chamber (17) and extends to the outside, and the sliding block (15) is slidably connected to the power chamber (17), and the two connecting rods (16) are both rotatably connected to the power chamber (17).

4. The multi-stage filter according to claim 3, characterized in that: An operating panel (19) is fixedly mounted on the other end of the threaded rod (14), and a handle (18) is fixedly mounted on one side of the sliding frame (7).

5. The multi-stage filter according to claim 1, characterized in that: The plurality of fixed bars (3) are in close contact with the plurality of sliding bars (4) respectively.

6. The multi-stage filter according to claim 1, characterized in that: A water inlet pipe (9) is fixedly mounted on the top of the filter housing (1), and two water outlet pipes (10) are fixedly mounted on the bottom of the filter housing (1). The water inlet pipe (9) and the two water outlet pipes (10) are both in communication with the filter chamber (2).

7. The multi-stage filter according to claim 1, characterized in that: The filtering accuracy of the two filter screens (8) located above is smaller than the filtering accuracy of the two filter screens (8) located below.

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