A hydrodynamic cleaning device for filters and a pre-filter

Abstract

A hydrodynamic cleaning device for a filter and a pre-filter include a rotating frame and an impeller assembly. The rotating frame is axially rotatable and fitted around the outer periphery of the filter element assembly. The rotating frame rotates under the impact of the incoming water flow and synchronously drives the water flow in the water channel to rotate and flow. The impeller assembly is located near the drain end of the bottle and has an impeller. When the drain end is opened for draining, the water flow in the water channel drives the impeller to rotate coaxially and in the same direction as the rotating frame. The impeller rotates and moves axially to engage with the rotating frame and accelerate the rotation of the rotating frame. When the drain end is closed for draining, the impeller stops rotating and moves axially back to its original position, disengaging from the rotating frame. This invention prevents dirt from adhering to the inner wall of the filter bottle and the filter element assembly, reducing filter screen clogging and improving cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of filters, and in particular to a hydrodynamic cleaning device for filters and a pre-filter. Background Technology

[0002] Pre-filters are typically installed at the front end of the pipeline and are usually T-shaped. The top horizontal section has the inlet and outlet on either side. The bottom vertical section houses the main body and the internal cylindrical filter screen, with the drain outlet at the very bottom controlled by a valve.

[0003] Existing pre-filters on the market have a cleaning function. They use water to drive a scraping structure with embedded bristles or silicone strips to rotate and clean the filter screen. When draining, the drain valve is opened, and impurities and dirt on the outer surface of the filter screen and the inner surface of the filter bottle are removed by forward or backwashing.

[0004] This scraping structure has the following drawbacks: When the filter is operating for both water intake and wastewater discharge, the scraping structure is driven by the same water pressure, meaning the power is identical. However, during wastewater discharge, the filter element undergoes only forward or backwashing. The power required for the scraping structure to scrape away long-adhered dirt increases significantly, and the same power used during water intake cannot meet the scraping structure's power demands, resulting in poor cleaning performance. Furthermore, when the scraping structure cleans the filter screen surface, it can easily push impurities adhering to the screen, causing re-contamination of the filtered water. Also, when a large amount of dirt accumulates, the scraping structure is prone to jamming and malfunction. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of existing technologies that use scraping structures to clean filter screens, and to propose a hydrodynamic cleaning device and a pre-filter for filters, which reduces filter screen clogging and improves cleaning efficiency.

[0006] The present invention adopts the following technical solution:

[0007] A hydrodynamic cleaning device for a filter is installed between a bottle body and a filter element assembly, with a water flow channel formed between the inner wall of the bottle body and the outer periphery of the filter element assembly. The device is characterized by comprising a rotating frame and an impeller assembly. The rotating frame is axially rotatable and sleeved around the outer periphery of the filter element assembly. The rotating frame rotates under the impact of the incoming water flow and simultaneously drives the water flow within the water flow channel to rotate and flow. The impeller assembly is located near the drain end of the bottle body and has an impeller. When the drain end is opened for drainage, the water flow within the water flow channel drives the impeller to rotate coaxially and in the same direction as the rotating frame. Simultaneously, the impeller rotates and moves axially to engage with the rotating frame, accelerating its rotation. When the drain end is closed for drainage, the impeller stops rotating and moves axially back to its original position, disengaging from the rotating frame.

[0008] The rotating frame is equipped with a drive unit located at one end of the rotating frame near the water inlet and has several transmission plates. The transmission plates are distributed at intervals along the circumference of the rotating frame. The transmission plates are provided with transmission inclined surfaces, which extend axially and are inclined clockwise or counterclockwise.

[0009] It also includes a flow guide frame, which is fixedly sleeved on the outer periphery of the filter element assembly near the water inlet end and has several flow guide channels. The flow guide channels are distributed at intervals along the circumference of the flow guide frame. The flow guide channels are also provided with flow guide slopes, which extend axially and whose inclination direction is opposite to that of the drive slope. The water inlet flows through the flow guide slopes and then impacts the drive slopes.

[0010] The rotating frame also includes two sets of bodies, several connecting rods and a spiral body. The two sets of bodies are spaced apart along the axial direction, the several connecting rods are spaced apart along the circumference and connected between the two sets of bodies, and the spiral body is connected to the several connecting rods and is spiral in shape. The drive unit is located on the outer periphery of the set near the water inlet end of the water flow channel.

[0011] The impeller assembly is located near the drain end of the bottle and has an impeller cavity. The impeller cavity is connected to the water flow channel. The impeller is located inside the impeller cavity and has a first transmission part. The rotating frame has a second transmission part at one end opposite the impeller. When the drain end is opened for draining, the water flow in the water flow channel enters the impeller cavity, driving the impeller and the rotating frame to rotate coaxially and in the same direction. The impeller rotates while moving axially, so that the first transmission part and the second transmission part are engaged to accelerate the rotation of the rotating frame. When the drain end is closed for draining, the impeller stops rotating and moves axially back to its original position, so that the first transmission part disengages from the second transmission part.

[0012] The impeller cavity is provided with a rotating shaft and a drain hole. The rotating shaft is coaxial with the rotating shaft of the rotating frame, and the drain hole is connected to the drain end. The impeller is rotatably sleeved on the rotating shaft and is provided with several blades. The blades are distributed at intervals along the circumference of the impeller. The blades are also designed to extend obliquely along the axial direction and have an angle between them and the rotating shaft, with the angle being 5-30°.

[0013] The impeller assembly also includes an outer shell and an inner shell. The outer shell is fitted over the inner shell and forms an impeller cavity with it. At least one flow guide is provided on the outer periphery of the inner shell. The flow guide connects the impeller cavity and the water flow channel and is provided with an inclined surface.

[0014] The first transmission part includes a plurality of first transmission teeth, which are circumferentially spaced apart; the second transmission part includes a plurality of second transmission teeth, which are circumferentially spaced apart. When the first transmission part and the second transmission part are in transmission cooperation, the plurality of first transmission teeth and the plurality of second transmission teeth mesh.

[0015] A pre-filter with a cleaning function includes a bottle body, a filter element assembly, and a drain valve assembly. The bottle body is provided with an inlet end, an outlet end, and a drain end. The filter element assembly is located inside the bottle body. The drain end is connected to both the inlet end and the outlet end. The drain valve assembly is connected to the drain end to open or close the drain. The filter is characterized by further including a hydrodynamic cleaning device for the filter. When the outlet end is open and the drain end is closed, the rotating water flow in the water flow channel flows out from the outlet end after being filtered by the filter element assembly. When the drain end is open, the water flow in the water flow channel is discharged from the drain valve assembly at the drain end.

[0016] The bottle body includes a bottle body and a connector. The bottle body is axially continuous and has a drain end at one end. The connector is detachably fixed to the other end of the bottle body and has an inlet end and an outlet end. The filter element assembly is located inside the bottle body.

[0017] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In this invention, a rotating frame is axially rotatable and fitted around the outer periphery of the filter element assembly. The rotating frame can rotate under the impact of the incoming water flow, causing the water flow in the water channel to rotate and flow, so that dirt does not adhere to the inner wall of the filter bottle and the filter element assembly, reducing filter screen clogging. When the drain end is opened for draining, the impeller of the impeller assembly is coaxial with the rotating frame and rotates in the same direction. The impeller and the rotating frame are driven together and accelerate the rotation of the rotating frame, improving the cleaning intensity. When the drain end is closed for draining, the impeller disengages from the rotating frame, avoiding interference with the rotation of the rotating frame.

[0019] 2. In this invention, the drive unit is provided with a plurality of transmission plates, and the transmission plates are provided with transmission inclined surfaces; it also includes a flow guide frame, and the flow guide frame is provided with a plurality of flow guide channels respectively with flow guide inclined surfaces. The inclination direction of the flow guide inclined surfaces is opposite to the inclination direction of the transmission inclined surfaces. After the inlet water flows through the flow guide inclined surfaces, the water flow continuously impacts the transmission inclined surfaces at a fixed angle, ensuring that the rotating frame can rotate at high speed and stably.

[0020] 3. In this invention, the rotating frame also includes a sleeve, several connecting rods and a spiral body. Several connecting rods are connected between two sleeves, and the spiral body is connected to several connecting rods and is spiral in shape. This hollow structure does not affect the water flow in the water channel, and the spiral-shaped spiral body allows the water flow to be guided to form a spiral vortex when the rotating frame rotates, ensuring that dirt in the axial direction can rotate synchronously and not adhere to the inner wall of the filter bottle and the filter screen.

[0021] 4. In this invention, a rotating shaft is provided inside the impeller cavity. The rotating shaft is coaxial with the rotating shaft of the rotating frame to ensure that the rotation of the impeller is coaxial with the rotating frame. The impeller is also provided with blades that extend obliquely along the axial direction. The blades and the rotating shaft have an angle of 5-30°. The use of such blades with an oblique angle allows the impeller to rotate while also moving along the axial direction, so as to smoothly cooperate with the rotating shaft transmission. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the filter of the present invention;

[0023] Figure 2 for Figure 1 Exploded view;

[0024] Figure 3 For rotating frame three-dimensional Figure 1 ;

[0025] Figure 4 For rotating frame three-dimensional Figure 2 ;

[0026] Figure 5 for Figure 4 Enlarged view of point A;

[0027] Figure 6 This is a 3D view of the air deflector.

[0028] Figure 7 This is an exploded view of the impeller assembly;

[0029] Figure 8 A three-dimensional view of the impeller;

[0030] Figure 9 This is the front view of the impeller;

[0031] Figure 10 for Figure 8 Enlarged view of point B;

[0032] Figure 11 Diagram of the inner shell structure;

[0033] Figure 12 This is an exploded view of the filter element assembly;

[0034] Figure 13 Diagram showing the assembly of the rotating frame and impeller (with the first and second transmission parts separated);

[0035] Figure 14 Diagram showing the mating of the rotating frame and impeller assembly (transmission mating of the first and second transmission parts);

[0036] Figure 15 This is a cross-sectional view (filtering state) of the filter of the present invention;

[0037] Figure 16 This is a cross-sectional view of the filter of the present invention (drainage state);

[0038] in:

[0039] 10. Bottle body; 11. Bottle frame; 12. Connector; 13. Inlet; 14. Outlet; 15. Drain; 16. Water flow channel; 20. Filter element assembly; 21. Filter screen; 22. Support; 30. Rotating frame; 31. Drive unit; 32. Transmission plate; 33. Transmission inclined surface; 34. Sleeve; 35. Connecting rod; 36. Spiral; 37. Second transmission unit; 40. Guide frame; 41. Guide channel; 42. Guide inclined surface; 50. Impeller assembly; 51. Impeller cavity; 52. Impeller; 53. First transmission unit; 54. Rotating shaft; 55. Drain hole; 56. Blade; 57. Outer shell; 58. Inner shell; 59. Guide port; 60. Drain valve assembly; 61. Adapter; 62. Drain valve; 70. Pressure gauge assembly.

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0041] The present invention will be further described below through specific embodiments.

[0042] In this invention, the terms "first," "second," and "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] See Figures 1 to 16A hydrodynamic cleaning device for a filter is disclosed, which is installed between a bottle body 10 and a filter element assembly 20. A water flow channel 16 is formed between the inner wall of the bottle body 10 and the outer periphery of the filter element assembly 20, allowing incoming water to enter the filter element assembly 20 for filtration. The cleaning device includes a rotating frame 30 and an impeller assembly 50. The rotating frame 30 is axially rotatable and fitted around the outer periphery of the filter element assembly 20, and is equipped with a drive unit 31. The drive unit 31 drives the rotating frame 30 to rotate under the impact of the incoming water flow. The rotating frame 30 synchronously drives the water flow in the water flow channel 16 to rotate and flow, thus achieving cleaning. The high-speed rotating frame 30 causes the water in the water flow channel 16 to form a vortex, which can drive dirt to rotate synchronously, preventing dirt from adhering to the inner wall of the bottle body 10 and the filter element assembly 20.

[0045] Among them, see Figure 3 , Figure 4 The drive unit 31 is located at the end of the rotating frame 30 near the water inlet 13 and is provided with several transmission plates 32. The transmission plates 32 are distributed at intervals along the circumference of the rotating frame 30. Each transmission plate 32 is provided with a transmission ramp 33, which extends axially and is inclined clockwise or counterclockwise. The incoming water flow continuously impacts the transmission ramp 33, and the impact force can drive the rotating frame 30 to rotate continuously at high speed. The rotation direction of the rotating frame 30 is related to the inclination of the transmission ramp 33 and is set according to the actual situation.

[0046] Furthermore, to ensure that the incoming water flow impacts the drive unit 31 at a fixed angle, thereby making the rotation of the rotating frame 30 more stable, see [reference needed]. Figure 6 The invention also includes a flow guide frame 40, which is fixedly sleeved on the outer periphery of the filter element assembly 20 near the water inlet end 13 and has a plurality of flow guide channels 41. The plurality of flow guide channels 41 are distributed at intervals along the circumference of the flow guide frame 40. The flow guide channels 41 are also provided with flow guide slopes 42, which extend axially and whose inclination direction is opposite to that of the inclination direction of the transmission slope 33. For example, if the transmission slope 33 is inclined clockwise, then the flow guide slope 42 is inclined counterclockwise, and if the transmission slope 33 is inclined counterclockwise, then the flow guide slope 42 is inclined clockwise. After the inlet water flows through the flow guide slope 42, the water flow generates a rotational inertia in a single direction and then impacts the transmission slope 33.

[0047] To ensure that the rotating frame 30 can drive the water flow in the water channel 16 to rotate at high speed, the rotating frame 30 of the present invention further includes two sets of bodies 34, several connecting rods 35, and a spiral body 36. The two sets of bodies 34 are distributed axially at intervals, one set of bodies 34 is close to the water inlet end 13 of the water channel 16, and the other set of bodies 34 is close to the sewage outlet end 15 of the water channel 16. The driving part 31 is located on the outer periphery of the set of bodies 34 close to the water inlet end 13 of the water channel 16. The several connecting rods 35 are distributed circumferentially at intervals and connected between the two sets of bodies 34. The spiral body 36 is connected to the several connecting rods 35 and is spiral in shape. That is, the rotating frame 30 has a hollow structure that does not affect the water flow in the water channel 16. Furthermore, the spiral body 36 is provided so that when the rotating frame 30 rotates, it can guide the water flow to form a spiral-like vortex, ensuring that dirt in the axial direction can rotate synchronously and not adhere to the inner wall of the filter bottle and the filter screen 21.

[0048] In this invention, see Figures 7-11 The impeller assembly 50 is located near the drain end 15 of the bottle body 10 and includes an impeller cavity 51 and an impeller 52. The impeller cavity 51 is connected to the water flow channel 16, allowing water from the water flow channel 16 to flow into the impeller cavity 51. The impeller 52 is located within the impeller cavity 51 and includes a first transmission part 53. The impeller 52 is configured to be axially movable and circumferentially rotatable, and its rotation axis coincides with the rotation axis 54 of the rotating frame 30. The rotating frame 30 has a second transmission part 37 at one end opposite the impeller 52, and the impeller cavity 51 may have a hole for inserting the second transmission part 37.

[0049] This invention features an impeller assembly 50. When the drain end 15 is opened for sewage discharge, water from the water flow channel 16 enters the impeller cavity 51, impacting the impeller 52 and causing it to rotate coaxially and in the same direction as the rotating frame 30. The rotational speed of the impeller 52 is greater than that of the rotating frame 30. Simultaneously, the impeller 52 moves axially, engaging the first transmission part 53 with the second transmission part 37. This causes the impeller 52 to accelerate the rotation of the rotating frame 30, resulting in more intense cleaning of impurities and dirt. The water containing impurities and dirt flows rapidly through the drain end 15. When the drain end 15 is closed, the impeller 52 stops rotating and, under gravity, moves axially back to its original position, i.e., sinks. This disengages the first transmission part 53 from the second transmission part 37. There is no direct connection between the impeller 52 and the rotating frame 30, thus avoiding interference with the rotation of the rotating frame 30.

[0050] Furthermore, the impeller cavity 51 is provided with a rotating shaft 54 ​​and at least one drain hole 55. The rotating shaft 54 ​​is coaxial with the rotating shaft of the rotating frame 30, and the drain hole 55 is connected to the drain end 15, so the water in the impeller cavity 51 can flow from the drain hole 55 to the drain end 15 and then be discharged. The impeller 52 is rotatably sleeved on the rotating shaft 54 ​​and is provided with a number of blades 56. The blades 56 are distributed circumferentially around the impeller 52 and are also configured to extend obliquely along the axial direction, which can be clockwise or counterclockwise. The blades 56 and the rotating shaft 54 ​​have an angle α, the value of which is set according to the actual situation, for example, the angle is 5-30°. The number of blades 56 can be set according to actual needs, for example, 3-8 blades. The blades 56 of the impeller 52 adopt this oblique arrangement, so that when the blades 56 rotate, they can also move along the rotating shaft 54 ​​in the direction of the second transmission part 37 under the action of water flow.

[0051] In practical applications, the impeller assembly 50 also includes a housing 57 and an inner housing 58. The housing 57 can be fixed relative to the drain end 15 of the bottle 10, and the outer periphery of the housing 57 is sealed to the inner wall of the bottle 10 by a sealing ring. The housing 57 is fitted over the inner housing 58 and forms an impeller cavity 51 with it. A sealing ring is also provided between the housing 57 and the inner housing 58 for sealing. The housing 57 and the inner housing 58 can be connected by a detachable method, such as a threaded connection or a snap-fit ​​engagement. The outer periphery of the inner housing 58 is provided with at least one guide port 59, which connects the impeller cavity 51 and the water flow channel 16 and has an inclined surface. The guide port 59 and its inclined surface allow the water flow from the water flow channel 16 to enter the impeller cavity 51 at a set angle and impact the blades 56, ensuring the stable rotation of the blades 56.

[0052] See Figure 5 , Figure 10 The first transmission part 53 is formed at the end of the rotating shaft 54. The first transmission part 53 includes a plurality of first transmission teeth, which are circumferentially spaced apart. The second transmission part 37 is formed at the corresponding end of the sleeve 34 of the rotating frame 30. The second transmission part 37 includes a plurality of second transmission teeth, which are circumferentially spaced apart. When the first transmission part 53 and the second transmission part 37 are engaged, the plurality of first transmission teeth and the plurality of second transmission teeth mesh to achieve circumferential transmission. That is, when the first transmission part 53 rotates, it synchronously drives the second transmission part 37 to rotate coaxially.

[0053] The hydrodynamic cleaning device of the present invention can be applied to a filter having a bottle body 10 and a filter element assembly 20.

[0054] Based on this, see Figure 1 , Figure 2 and Figures 15-16The present invention also proposes a pre-filter with a cleaning function, comprising a bottle body 10, a filter element assembly 20, a drain valve assembly 60, and a hydrodynamic cleaning device for the filter described above. The bottle body 10 is provided with an inlet end 13, an outlet end 14, and a drain end 15. The filter element assembly 20 is located inside the bottle body 10 for filtering impurities and dirt. The drain end 15 is connected to both the inlet end 13 and the outlet end 14. The drain valve assembly 60 is connected to the drain end 15 to open or close the drain. The hydrodynamic cleaning device described above is installed between the bottle body 10 and the filter element assembly 20.

[0055] The bottle body 10 includes a bottle body 11 and a connector 12. The bottle body 11 is axially continuous and has a drain end 15 at one end. The connector 12 is detachably fixed to the other end of the bottle body 11 and has a water inlet end 13 and a water outlet end 14. The filter element assembly 20 is located inside the bottle body 11. A pressure gauge assembly 70 can also be installed on the connector 12 to detect the water pressure at the water outlet end 14.

[0056] The filter element assembly 20 adopts a conventional filtration structure, see [link / reference]. Figure 12 The system includes a filter screen 21 and a support 22. The filter screen 21 is fixed to the support 22, which is placed inside the rotating frame 30. A flow guide 40 is fixedly sleeved on the end of the support 22 near the water inlet 13, thereby fixing the support 22 relative to the bottle body 10. The flow guide 40 and the support 22 are detachably fixed, for example, by a threaded connection or a snap-fit ​​connection.

[0057] The drain valve assembly 60 includes an adapter 61 and a drain valve 62. The adapter 61 is fixed to the drain end 15 of the bottle body 10. The inlet end 13 of the drain valve 62 is connected to the connector, and the outlet end 14 can be connected to a drain pipe through another adapter 61. The drain valve 62 is controlled to open or close the drain.

[0058] The working principle of the device and filter of the present invention is as follows:

[0059] See Figure 15 When the filter outlet 14 is open and the drain 15 is closed, water flows through the inlet 13 into the guide frame 40. Guided by the guide slope 42 of the guide frame 40, it impacts the transmission slope 33 of the rotating frame 30, causing the rotating frame 30 to rotate. The rotation of the rotating frame 30 causes the water and dirt in the water flow channel 16 to rotate as well. After being filtered by the filter element assembly 20, the water flows to the outlet 14. In this state, the impeller 52 of the impeller assembly 50 sinks under gravity, its first transmission part 53 does not mesh with the second transmission part 37 of the rotating frame 30, and the impeller 52 does not rotate. The rotating frame 30 has low energy loss and high rotation speed, resulting in a low overall pressure drop of the filter.

[0060] See Figure 16When the drain end 15 is opened for sewage discharge, the outlet end 14 can be closed. The water flows through the inlet end 13 into the guide frame 40, and is guided by the guide slope 42 of the guide frame 40. It impacts the transmission slope 33 of the rotating frame 30, causing the rotating frame 30 to rotate. The rotation of the rotating frame 30 causes the water flow and dirt in the water flow channel 16 to rotate as well. The rotating water flow enters through the guide port 59 of the impeller cavity 51 and impacts the blades 56, causing the impeller 52 to rotate. The impeller 52 rotates and moves axially at the same time, so that the first transmission part 53 and the second transmission part 37 are in transmission cooperation. Then the impeller 52 drives the rotating frame 30 to rotate faster, cleaning impurities and dirt more thoroughly. The water flow with impurities and dirt rotates and flows rapidly in the impeller cavity 51, and then flows through the drain hole 55 to the drain valve group 60 of the drain end 15 before being discharged.

[0061] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A hydrodynamic cleaning device for a filter, installed between a bottle and a filter element assembly, wherein a water flow channel is formed between the inner wall of the bottle and the outer periphery of the filter element assembly; characterized in that: The filter includes a rotating frame and an impeller assembly. The rotating frame is rotatably fitted around the outer periphery of the filter element assembly. The rotating frame can rotate under the impact of the incoming water flow and synchronously drive the water flow in the water flow channel to rotate and flow. The impeller assembly is located near the drain end of the bottle and has an impeller with several blades. The blades are arranged to extend obliquely along the axial direction. When the drain end is opened for draining, the water flow in the water flow channel drives the impeller and the rotating frame to rotate coaxially and in the same direction. The impeller rotates and moves axially to engage with the rotating frame and accelerate the rotation of the rotating frame. When the drain end is closed for draining, the impeller stops rotating and moves axially back to its original position, disengaging from the rotating frame.

2. The hydrodynamic cleaning device for a filter as described in claim 1, characterized in that: The rotating frame is provided with a drive unit, which is located at one end of the rotating frame near the water inlet and is provided with a plurality of transmission plates. The plurality of transmission plates are distributed at intervals along the circumference of the rotating frame. The transmission plates are provided with transmission inclined surfaces, which extend axially and are inclined in a clockwise or counterclockwise direction.

3. The hydrodynamic cleaning device for a filter as described in claim 2, characterized in that: It also includes a flow guide frame, which is fixedly sleeved on the outer periphery of the filter element assembly near the water inlet end and has a plurality of flow guide channels. The plurality of flow guide channels are distributed at intervals along the circumference of the flow guide frame. The flow guide channels are also provided with flow guide slopes, which extend axially and whose inclination direction is opposite to that of the drive slope. The inlet water flows through the flow guide slopes and then impacts the drive slopes.

4. The hydrodynamic cleaning device for a filter as described in claim 2, characterized in that: The rotating frame also includes two sleeves, several connecting rods, and a spiral body. The two sleeves are spaced apart along the axial direction, the several connecting rods are spaced apart along the circumferential direction and connected between the two sleeves, and the spiral body is connected to the several connecting rods and is spiral in shape. The driving part is located on the outer periphery of the sleeve near the water inlet end of the water flow channel.

5. The hydrodynamic cleaning device for a filter as described in claim 1, characterized in that: The impeller assembly has an impeller cavity that communicates with the water flow channel. The impeller is located inside the impeller cavity and has a first transmission part. The rotating frame has a second transmission part at one end opposite to the impeller. When the drain end is opened for sewage discharge, the water flow in the water flow channel enters the impeller cavity, driving the impeller and the rotating frame to rotate coaxially and in the same direction. The impeller rotates while moving axially, causing the first transmission part and the second transmission part to engage in transmission and accelerate the rotation of the rotating frame. When the drain end is closed for sewage discharge, the impeller stops rotating and moves axially back to its original position, causing the first transmission part to disengage from the second transmission part.

6. The hydrodynamic cleaning device for a filter as described in claim 5, characterized in that: The impeller cavity is provided with a rotating shaft and a drain hole. The rotating shaft is coaxial with the rotating shaft of the rotating frame, and the drain hole is connected to the drain end. The impeller is rotatably sleeved on the rotating shaft, and a number of blades are distributed at intervals along the circumference of the impeller and have an angle with the rotating shaft.

7. The hydrodynamic cleaning device for a filter as described in claim 6, characterized in that: The angle between the blade and the rotating shaft is 5-30°.

8. The hydrodynamic cleaning device for a filter as described in claim 5, characterized in that: The impeller assembly further includes an outer shell and an inner shell. The outer shell is fitted over the inner shell and forms the impeller cavity therewith. At least one flow guide is provided on the outer periphery of the inner shell. The flow guide connects the impeller cavity and the water flow channel and is provided with an inclined surface.

9. A hydrodynamic cleaning device for a filter as described in claim 5, characterized in that: The first transmission part includes a plurality of first transmission teeth, which are circumferentially spaced apart; the second transmission part includes a plurality of second transmission teeth, which are circumferentially spaced apart. When the first transmission part and the second transmission part are in transmission cooperation, the plurality of first transmission teeth and the plurality of second transmission teeth mesh.

10. A pre-filter with a cleaning function, comprising a bottle body, a filter element assembly, and a drain valve assembly, wherein the bottle body is provided with an inlet end, an outlet end, and a drain end, the filter element assembly is located inside the bottle body, the drain end is connected to the inlet end and the outlet end respectively, and the drain valve assembly is connected to the drain end to open or close the drain, characterized in that: It also includes a hydrodynamic cleaning device for a filter according to any one of claims 1 to 9; when the water outlet is open and the drain outlet is closed, the rotating water flow in the water flow channel flows out from the water outlet after being filtered by the filter element assembly; when the drain outlet is open, the water flow in the water flow channel is discharged from the drain valve group of the drain outlet.

11. A pre-filter with cleaning function as described in claim 10, characterized in that: The bottle body includes a bottle body and a connector. The bottle body is axially continuous and has a drain end at one end. The connector is detachably fixed to the other end of the bottle body and has a water inlet end and a water outlet end. The filter element assembly is located inside the bottle body.

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