A filter cartridge pressing plate structure and a pre-filter using the same

Abstract

The utility model discloses a kind of pressing plate structure of filter core and prefilter using the pressing plate structure, it is related to filter technical field, to solve the technical problem of unable to adapt to various height filter core.The technical scheme main point is: including water valve base, the bottom of water valve base is provided with inner pressing plate ring and outer pressing plate ring, the inner wall sealing connection of the inner pressing plate ring has pressing plate main body, the outer wall of the inner pressing plate ring is elastically connected with pressing plate connecting plate by compression spring, the pressing plate connecting plate is fixedly connected to pressing plate main body, the bottom of the water valve base is sealingly connected with filter cup, the bottom of the pressing plate connecting plate abuts with filter core, the filter core is set in filter cup, bottom supporting card is provided in the filter cup.The utility model aims at providing a kind of pressing plate structure of filter core and prefilter using the pressing plate structure.

Description

Technical Field

[0001] This utility model relates to filters, and more specifically, to a pressure plate structure for a filter element and a pre-filter using the pressure plate structure. Background Technology

[0002] The pre-filter is the first filtration device in a water purifier. It is mainly used to filter out large particles such as sediment, rust, insect eggs, and red worms from tap water. Its function is to provide a better water source for subsequent water purification and to protect the water purifier. Because the pre-filter is the first filtration device and mainly filters large particles, its replacement frequency is much higher than that of other filter cartridges.

[0003] Chinese Patent Announcement CN221665325U discloses a pre-filter water circuit conversion device. Its key technical features include: an upper housing and a lower housing that are interconnected; a filter element is disposed within the lower housing; a first through hole and a second through hole are provided on opposite side walls of the upper housing; a water circuit converter connecting the upper and lower housings is disposed within the upper housing; the water circuit converter includes a tube body and a tube core; the tube body has a first water inlet and a second water inlet corresponding to the first and second through holes; the tube core has an inlet and an outlet on opposite side walls; a partition is disposed within the tube core; an inlet channel is provided on one side of the partition, connecting the inlet to the bottom of the tube body; an outlet channel is provided on the other side of the partition, connecting the outlet to the bottom of the tube body; a rotating shaft is disposed at the center of the top surface of the tube core; a rotating wheel is fitted around the rotating shaft; and an adjustment groove is provided on the upper housing corresponding to the rotating wheel.

[0004] In the above technical solution, the water circuit converter is adjusted by rotating the wheel, and the inlet and outlet directions are reversed according to the installation requirements. However, in actual use, there are filter cartridges of different heights. The water purifier cannot adjust the height of filter cartridges of various heights, causing the filter cartridges to shake and shift, thus affecting the overall filtration effect.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a pressure plate structure for filter elements. The above-mentioned technical objective of this utility model is achieved through the following technical solution: a filter element pressure plate structure, including a water valve base, characterized in that: an inner pressure plate ring and an outer pressure plate ring are provided at the bottom of the water valve base, the inner wall of the inner pressure plate ring is sealed and connected to a pressure plate body, the outer wall of the inner pressure plate ring is elastically connected to a pressure plate connecting plate through a compression spring, the pressure plate connecting plate is fixedly connected to the pressure plate body, a filter cup is sealed and connected to the bottom of the water valve base, a filter element is abutted against the bottom of the pressure plate connecting plate, the filter element is disposed in the filter cup, and a bottom support plate is provided in the filter cup.

[0007] By adopting the above technical solution: the inner and outer pressure plate rings at the bottom of the water valve base provide a relatively sealed installation position for the pressure plate body and the pressure plate connecting plate, making the installation of the pressure plate body and the pressure plate connecting plate more stable, and preventing water from seeping in before and after filtration. One end of the compression spring is fixedly connected to the outer wall of the inner pressure plate ring, and the other end is fixedly connected to the pressure plate connecting plate. The compression spring generates force, causing the pressure plate body and the pressure plate connecting plate to abut against the filter element, filling the height difference between the filter element and the overall pressure plate structure. In conjunction with the bottom support plate, it fixes the top and bottom of the filter element, preventing the filter element from shaking or shifting during the filtration of tap water, thus improving the overall stability of the equipment. The seal between the water valve base and the filter cup prevents tap water from seeping out of the entire equipment, and the filter cup also provides stable support for the filter element.

[0008] The present invention is further configured such that: the surface of the water valve base is provided with a plurality of water inlet columns and water outlet columns, a water inlet filter port is formed between the filter cup and the filter element, the water inlet filter port is connected to the water inlet column, and a water outlet filter port is provided on the filter element, the filter element is connected to the water outlet column.

[0009] The present invention is further configured such that: the inner wall of each water inlet column is sealed with a water inlet pad, the top of each water inlet pad is provided with a water inlet valve body, a water inlet valve rod passes through the water inlet valve body, a water inlet valve core is fixedly connected to the bottom of the water inlet valve rod, the water inlet valve core is elastically connected to the water inlet valve body, a lifting rod is provided at the bottom of the water inlet valve core, the number of lifting rods corresponds to the number of water inlet columns, the lifting rod is fixedly connected to a lifting base, and a plurality of water inlet valve ports are opened on the surface of the lifting base.

[0010] The present invention is further configured such that: a water outlet pad is sealed to the inner wall of the water outlet column, a water outlet valve body is provided at the top of the water outlet pad, a water outlet valve rod is inserted through the water outlet valve body, a water outlet valve core is fixedly connected to the bottom of the water outlet valve rod, and the water outlet valve core is elastically connected to the water outlet valve body.

[0011] The present invention is further configured such that: the bottom bolt of the outer pressure plate ring is fixed with a limiting plate for restricting the horizontal movement of the pressure plate body and the pressure plate connecting plate.

[0012] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pre-filter that uses a pressure plate structure.

[0013] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a pre-filter using a pressure plate structure, characterized in that: the inner wall of the water valve base is sealed with a flow guide base, the surface of the flow guide base is provided with an inlet flow guide port and an outlet flow guide port, the inlet flow guide port and the outlet flow guide port are respectively connected to the inlet column and the outlet column, and are connected with inlet and outlet connectors.

[0014] By adopting the above technical solution: the water valve base provides corresponding support for the guide base, and tap water can enter the pre-filter from the inlet connector, first enter the inlet guide port, and then enter the inlet column through the inlet guide port. After filtration is completed, the filtered water leaves from the outlet column and enters the outlet guide port, and is finally discharged through the inlet and outlet connectors.

[0015] The present invention is further configured such that: the flow guide base is sealed to a connector base, the inner wall of the connector base is threaded to a water valve base, two displacement connecting plates are fixed to the periphery of the connector base by bolts, the two displacement connecting plates are rotatably connected to an adjusting plate, the two adjusting plates are interconnected by an adjusting ring, both adjusting plates are rotatably connected to an adjusting arm, both adjusting arms are rotatably connected to a connecting arm, both connecting arms are rotatably connected to the displacement connecting plate, and each adjusting arm has a handle connecting plate on its side, and both handle connecting plates are rotatably connected to an adjusting assembly.

[0016] The present invention is further configured such that: the adjustment assembly includes an adjustment handle rotatably connected to two handle connecting plates, two adjustment columns are fixedly connected to the side of the adjustment handle, each of the two adjustment columns is elastically connected to a pressing block, each of the two pressing blocks is rotatably connected to the adjustment handle, and a limit groove is formed between the two pressing blocks.

[0017] The present invention is further configured such that: a limiting bolt is provided on the limiting slot, the limiting bolt passes through the adjusting handle and is fixedly connected to the limiting base, and the limiting base bolt is fixed to the connector base.

[0018] The present invention is further configured such that: a cup holder is provided around the filter cup, a connecting ring is provided around the cup holder, and the adjusting ring passes through the connecting ring.

[0019] The present invention has the following beneficial effects: 1. The pressure plate body and the pressure plate connecting plate abut against the filter element and cooperate with the bottom support plate to fix the top and bottom of the filter element, so that the filter element does not shake or shift during the filtration process, thereby improving the overall stability of the equipment.

[0020] 2. The limiting plate, which is fixed by bolts at the bottom of the outer pressure plate ring, restricts the horizontal movement of the pressure plate body and the pressure plate connecting plate, ensuring the stability of the pressure plate body.

[0021] 3. The height of the outlet water column is greater than that of the inlet water column, so that the water before and after filtration will not mix during the water inlet and outlet process, thus ensuring the filtration effect.

[0022] 4. By opening and closing the inlet valve core and the outlet valve core, the inflow and outflow of tap water and filtered water can be controlled respectively, which can stop the inflow and outflow, making it convenient to manage the water flow.

[0023] 5. The adjustment component, as a power source, can drive the water valve base to move through a series of rotation and displacement operations, thereby closing the gap between the inlet valve core and the inlet valve body, and closing the gap between the outlet valve core and the outlet valve body, thus achieving the function of stopping the inflow and the outflow of the whole. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of this embodiment; Figure 2 This is an example. Figure 1 A magnified view of part A in the image; Figure 3 This is a cross-sectional view of this embodiment; Figure 4 This is a cross-sectional view of the water valve base, lifting base, flow guide base, and connector base in this embodiment; Figure 5 This is a cross-sectional view of the water valve base in this embodiment.

[0025] Attached Figure Descriptions: 1. Water valve base; 2. Inner pressure plate ring; 3. Outer pressure plate ring; 4. Pressure plate body; 5. Pressure plate connecting plate; 6. Filter cup; 7. Filter element; 8. Base support plate; 9. Inlet water column; 10. Outlet water column; 11. Inlet water filter port; 12. Outlet water filter port; 13. Inlet water pad; 14. Inlet water valve body; 15. Inlet water valve rod; 16. Inlet water valve core; 17. Lifting rod; 18. Lifting base; 19. Inlet water valve port; 20. Outlet water pad; 21. Outlet water valve body; 22. Outlet water valve 23. Rod; 24. Outlet valve core; 25. Limiting plate; 26. Flow guide base; 27. Inlet flow guide port; 28. Outlet flow guide port; 29. ​​Inlet / outlet connector; 30. Connector base; 31. Displacement connecting plate; 32. Adjusting plate; 33. Adjusting arm; 34. Connecting arm; 35. Handle connecting plate; 36. Adjusting handle; 37. Adjusting column; 38. Pressing block; 39. Limiting slot; 40. Limiting bolt; 41. Limiting base; 42. Cup holder; 43. Connecting ring; 44. Compression spring. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0028] Example 1: like Figures 3 to 5 As shown, a filter element pressure plate structure includes a water valve base 1. The bottom of the water valve base 1 is provided with an inner pressure plate ring 2 and an outer pressure plate ring 3. The inner wall of the inner pressure plate ring 2 is sealed and connected to a pressure plate body 4. The outer wall of the inner pressure plate ring 2 is elastically connected to a pressure plate connecting plate 5 through a compression spring 43. The pressure plate connecting plate 5 is fixedly connected to the pressure plate body 4. The bottom of the water valve base 1 is sealed and connected to a filter cup 6. The bottom of the pressure plate connecting plate 5 abuts against a filter element 7. The filter element 7 is disposed in the filter cup 6. A bottom support plate 8 is provided in the filter cup 6.

[0029] The inner pressure plate ring 2 and outer pressure plate ring 3 at the bottom of the water valve base 1 provide a relatively sealed installation position for the pressure plate body 4 and the pressure plate connecting plate 5, making the installation of the pressure plate body 4 and the pressure plate connecting plate 5 more stable and preventing water from seeping in before and after filtration. One end of the compression spring 43 is fixedly connected to the outer wall of the inner pressure plate ring 2, and the other end is fixedly connected to the pressure plate connecting plate 5. The compression spring 43 generates force, so that the pressure plate body 4 and the pressure plate connecting plate 5 abut against the filter element 7, filling the height difference between the filter element 7 and the overall pressure plate structure. In addition, it cooperates with the bottom support plate 8 to fix the top and bottom of the filter element 7, so that the filter element 7 will not shake or shift during the filtration of tap water, improving the overall stability of the equipment. The seal between the water valve base 1 and the filter cup 6 prevents tap water from seeping out of the equipment. Furthermore, the filter cup 6 also provides a stable support for the filter element 7.

[0030] like Figures 4 to 5 As shown, the surface of the water valve base 1 is provided with several inlet columns 9 and outlet columns 10. An inlet filter port 11 is formed between the filter cup 6 and the filter element 7. The inlet filter port 11 is connected to the inlet column 9. An outlet filter port 12 is opened on the filter element 7. The filter element 7 is connected to the outlet column 10.

[0031] Tap water enters the water valve base 1, and the water level in the water valve base 1 gradually rises. When the water level is higher than the height of the inlet column 9, the tap water enters the inlet column 9 and falls into the inlet filter port 11 between the filter cup 6 and the filter element 7. The filter element 7 performs corresponding adsorption and filtration on the tap water, causing the water level in the outlet filter port 12 to gradually rise. When it is higher than the height of the outlet column 10, the filtered water leaves the water valve base 1. The height of the outlet column 10 is greater than the height of the inlet column 9, so the water before and after filtration will not mix during the water inlet and outlet process.

[0032] like Figures 4 to 5 As shown, the inner wall of each water inlet column 9 is sealed with a water inlet pad 13. Each water inlet pad 13 is provided with a water inlet valve body 14 on its top. A water inlet valve rod 15 passes through the water inlet valve body 14. A water inlet valve core 16 is fixedly connected to the bottom of the water inlet valve rod 15. The water inlet valve core 16 is elastically connected to the water inlet valve body 14. A lifting rod 17 is provided at the bottom of the water inlet valve core 16. The number of lifting rods 17 corresponds to the number of water inlet columns 9. A lifting base 18 is fixedly connected to the lifting rod 17. Several water inlet valve ports 19 are opened on the surface of the lifting base 18.

[0033] By opening and closing the inlet valve core 16, the inlet and outlet of tap water can be controlled, and the inlet valve core 16 can stop the tap water from entering the inlet column 9. In use, the inlet pad 13 can raise the height of the inlet valve body 14, and the inlet pad 13 can also serve to install the inlet valve body 14. When the inlet valve core 16 needs to be opened, the lifting rod 17 at the bottom of the inlet valve core 16 acts as abutment against the inlet valve core 16. The elastic connection between the inlet valve core 16 and the inlet valve body 14 is a spring connection. When the spring is compressed accordingly, the inlet valve core 16 is lifted, and the corresponding inlet valve rod 15 is also displaced, creating a gap between the inlet valve core 16 and the inlet valve body 14. The tap water in the inlet column 9 can enter the inlet valve port 19 through the gap between the inlet valve core 16 and the inlet valve body 14, and finally enter the inlet filter port 11 for purification.

[0034] like Figures 4 to 5 As shown, the inner wall of the water outlet column 10 is sealed with a water outlet pad 20, the top of the water outlet pad 20 is provided with a water outlet valve body 21, a water outlet valve rod 22 is inserted inside the water outlet valve body 21, and a water outlet valve core 23 is fixedly connected to the bottom of the water outlet valve rod 22. The water outlet valve core 23 is elastically connected to the water outlet valve body 21.

[0035] By opening and closing the outlet valve body 21, the inflow and outflow of filtered water can be controlled, and the filtered water in the outlet filter port 12 can be stopped from flowing out. In use, the outlet pad 20 can raise the height of the outlet valve body 21, and the outlet pad 20 can also serve to install the outlet valve body 21. When the water level in the outlet filter port 12 gradually rises until it is higher than the pressure plate body 4 and the outlet pad 20, the elastic connection between the outlet valve core 23 and the outlet valve body 21 is a spring connection. Through water pressure, the outlet valve core 23 is lifted, the corresponding elasticity is compressed, the outlet valve body 21 makes a corresponding displacement, and a gap is generated between the outlet valve core 23 and the outlet valve body 21, and the filtered water is discharged from the outlet column 10.

[0036] like Figures 4 to 5As shown, the bottom bolts of the outer pressure plate ring 3 are fixed with a limiting plate 24 to restrict the horizontal movement of the pressure plate body 4 and the pressure plate connecting plate 5; the limiting plate 24 abuts against the periphery of the pressure plate connecting plate 5 to keep the pressure plate body 4 stable and prevent shaking and displacement during use.

[0037] Example 2: like Figures 1 to 3 As shown, a pre-filter using a pressure plate structure has a flow guide base 25 sealed to the inner wall of the water valve base 1. The surface of the flow guide base 25 is provided with an inlet flow guide port 26 and an outlet flow guide port 27. The inlet flow guide port 26 and the outlet flow guide port 27 are respectively connected to the inlet column 9 and the outlet column 10, and are also connected to the inlet and outlet connectors 28.

[0038] The water valve base 1 provides corresponding support for the flow guide base 25. Tap water can enter the pre-filter from the inlet connector, first enter the inlet guide port 26, and then enter the inlet column 9 through the inlet guide port 26. After filtration is completed, the filtered water leaves from the outlet column 10 and enters the outlet guide port 27, and is finally discharged through the inlet and outlet connectors 28.

[0039] The flow guide base 25 is sealed to the connector base 29. The inner wall of the connector base 29 is threaded to the water valve base 1. Two displacement connecting plates 30 are fixed to the periphery of the connector base 29 by bolts. The two displacement connecting plates 30 are rotatably connected to the adjusting plates 31. The two adjusting plates 31 are connected to each other by adjusting rings. Both adjusting plates 31 are rotatably connected to the adjusting arms 32. Both adjusting arms 32 are rotatably connected to the connecting arms 33. Both connecting arms 33 are rotatably connected to the displacement connecting plates 30. The sides of the adjusting arms 32 are provided with handle connecting plates 34. The two handle connecting plates 34 are rotatably connected to the adjusting components.

[0040] The adjustment component serves as the power source. By operating the adjustment component, the handle connecting plate 34 is rotated accordingly. The rotation of the handle connecting plate 34 can drive the adjustment arm 32 to rotate accordingly. The rotation of the adjustment arm 32 can drive the connecting arm 33 to rotate accordingly. The rotation of the connecting arm 33 can drive the displacement connecting plate 30 to move horizontally. The displacement of the displacement connecting plate 30 can drive the connector base 29 to move accordingly. Due to the threaded connection between the connector base 29 and the water valve base 1, the water valve base 1 also moves accordingly, so that the lifting plate no longer abuts against the inlet valve core 16, the spring is released, and the gap between the inlet valve core 16 and the inlet valve body 14 is closed, which has a stop effect on the whole. In addition, the water pressure in the outlet filter port 12 is insufficient to compress the spring between the outlet valve body 21 and the outlet valve core 23, and the gap between the outlet valve core 23 and the outlet valve body 21 is closed, which has a stop effect on the whole.

[0041] The adjustment assembly includes an adjustment handle 35 rotatably connected to two handle connecting plates 34. Two adjustment columns 36 are fixedly connected to the side of the adjustment handle 35. Each of the two adjustment columns 36 is elastically connected to a pressing block 37. Both pressing blocks 37 are rotatably connected to the adjustment handle 35. A limit groove 38 is formed between the two pressing blocks 37. A limit bolt 39 is provided on the limit groove 38. The limit bolt 39 passes through the adjustment handle 35 and is fixedly connected to a limit base 40. The limit base 40 is bolted to the connector base 29.

[0042] When it is necessary to fix the entire adjustment assembly, operate the pressing block 37. The two adjusting columns 36 limit the rotation angle of the pressing block 37. Rotate the adjusting handle 35 so that the limiting bolt 39 is inserted into the limiting slot 38 between the two pressing blocks 37. The head of the limiting bolt 39 abuts against the two pressing blocks 37. When the entire front filter needs to be closed, it can stop the water from flowing in and out before and after filtration. Similarly, operate the pressing block 37 and rotate the adjusting handle 35 so that the limiting bolt 39 leaves the limiting slot 38 between the two pressing blocks 37.

[0043] A cup holder 41 is provided around the filter cup 6, and a connecting ring 42 is provided around the cup holder 41. An adjusting ring passes through the connecting ring 42. The cup holder 41 serves to support the filter cup 6, and the connecting ring 42 supports the adjusting ring and the corresponding components on the adjusting ring.

[0044] The specific embodiments are merely explanations of this utility model and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A filter element pressure plate structure, comprising a water valve base (1), characterized in that: The bottom of the water valve base (1) is provided with an inner pressure plate ring (2) and an outer pressure plate ring (3). The inner wall of the inner pressure plate ring (2) is sealed and connected to the pressure plate body (4). The outer wall of the inner pressure plate ring (2) is elastically connected to the pressure plate connecting plate (5) through a compression spring (43). The pressure plate connecting plate (5) is fixedly connected to the pressure plate body (4). The bottom of the water valve base (1) is sealed and connected to a filter cup (6). The bottom of the pressure plate connecting plate (5) abuts against a filter element (7). The filter element (7) is set inside the filter cup (6). The filter cup (6) is provided with a bottom support plate (8).

2. The pressure plate structure of a filter element according to claim 1, characterized in that: The surface of the water valve base (1) is provided with several inlet columns (9) and outlet columns (10). An inlet filter port (11) is formed between the filter cup (6) and the filter element (7). The inlet filter port (11) is connected to the inlet column (9). An outlet filter port (12) is opened on the filter element (7). The filter element (7) is connected to the outlet column (10).

3. The pressure plate structure of a filter element according to claim 2, characterized in that: The inner wall of each water inlet column (9) is sealed with a water inlet pad (13). Each water inlet pad (13) is provided with a water inlet valve body (14) at the top. A water inlet valve rod (15) is inserted inside the water inlet valve body (14). A water inlet valve core (16) is fixedly connected to the bottom of the water inlet valve rod (15). The water inlet valve core (16) is elastically connected to the water inlet valve body (14). A lifting rod (17) is provided at the bottom of the water inlet valve core (16). The number of lifting rods (17) corresponds to the number of water inlet columns (9). A lifting base (18) is fixedly connected to the lifting rod (17). Several water inlet valve ports (19) are opened on the surface of the lifting base (18).

4. The pressure plate structure of a filter element according to claim 3, characterized in that: The inner wall of the water outlet column (10) is sealed with a water outlet pad (20). A water outlet valve body (21) is provided on the top of the water outlet pad (20). A water outlet valve rod (22) is inserted inside the water outlet valve body (21). A water outlet valve core (23) is fixedly connected to the bottom of the water outlet valve rod (22). The water outlet valve core (23) is elastically connected to the water outlet valve body (21).

5. The pressure plate structure of a filter element according to claim 1, characterized in that: The bottom bolts of the outer pressure plate ring (3) are fixed with a limiting plate (24) for limiting the horizontal movement of the pressure plate body (4) and the pressure plate connecting plate (5).

6. A pre-filter employing the pressure plate structure described in any one of claims 1-5, characterized in that: The inner wall of the water valve base (1) is sealed with a flow guide base (25). The surface of the flow guide base (25) is provided with an inlet flow guide (26) and an outlet flow guide (27). The inlet flow guide (26) and the outlet flow guide (27) are respectively connected to the inlet column (9) and the outlet column (10), and are connected to the inlet and outlet connectors (28).

7. The pre-filter according to claim 6, characterized in that: The flow guide base (25) is sealed to a connector base (29). The inner wall of the connector base (29) is threaded to the water valve base (1). Two displacement connecting plates (30) are fixed to the periphery of the connector base (29) by bolts. The two displacement connecting plates (30) are rotatably connected to an adjusting plate (31). The two adjusting plates (31) are connected to each other by an adjusting ring. Both adjusting plates (31) are rotatably connected to an adjusting arm (32). Both adjusting arms (32) are rotatably connected to a connecting arm (33). Both connecting arms (33) are rotatably connected to the displacement connecting plate (30). The sides of the adjusting arms (32) are provided with a handle connecting plate (34). Both handle connecting plates (34) are rotatably connected to an adjusting component.

8. The pre-filter according to claim 7, characterized in that: The adjustment assembly includes an adjustment handle (35) rotatably connected to two handle connecting plates (34). Two adjustment columns (36) are fixedly connected to the side of the adjustment handle (35). Each of the two adjustment columns (36) is elastically connected to a pressing block (37). Both pressing blocks (37) are rotatably connected to the adjustment handle (35). A limit slot (38) is formed between the two pressing blocks (37).

9. The pre-filter according to claim 8, characterized in that: The limiting slot (38) is provided with a limiting bolt (39), the limiting bolt (39) passes through the adjusting handle (35) and is fixedly connected to the limiting base (40), the limiting base (40) is bolted to the connector base (29).

10. The pre-filter according to claim 9, characterized in that: The filter cup (6) is provided with a cup holder (41) around its periphery, and a connecting ring (42) is provided around the cup holder (41), and the adjusting ring passes through the connecting ring (42).

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