CN214913848U

CN214913848U - Double-turbine cleaning structure of pre-filter

Info

Publication number: CN214913848U
Application number: CN202120148610.1U
Authority: CN
Inventors: 游浩; 王凯
Original assignee: Haining Meikang Environmental Protection Technology Co ltd
Current assignee: Haining Meikang Environmental Protection Technology Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-11-30
Anticipated expiration: 2031-01-19

Abstract

The utility model provides a two turbines of leading filter wash structure, it has solved the relatively poor scheduling problem of filter self-cleaning effect, it is including setting up the filter core barrel that just circumference has the filter screen in the filter housing, filter core barrel week is equipped with the filtration support body to the outside cover, and form former water cavity between the filter screen circumference outside and the filter housing circumference inboard, the filtration support body is for filter core barrel circumferential direction and axial positioning, it has the last turbine assembly who is used for being linked together water inlet and former water cavity to filter the support body upper end, the lower extreme has the lower turbine assembly who is used for being linked together former water cavity and drain, and go up turbine assembly and/or lower turbine assembly and filter the linkage of support body, have the slant water conservancy diversion mechanism that is located between turbine assembly and the lower turbine assembly and towards the filter screen circumference outside in filtration support body circumference. The utility model has the advantages of the filter screen clearance is effectual, stable in structure.

Description

Double-turbine cleaning structure of pre-filter

Technical Field

The utility model belongs to the technical field of the filter washs the structure, concretely relates to two turbines of leading filter wash structure.

Background

The pre-filter is the first coarse filter for water used in the whole house, and can filter large particles such as silt, rust, ova, red worms and the like in tap water. After long-time use, coarse particle impurities, silt, rust and the like are easily attached to a filter element of the pre-filter, so that the water passing amount is reduced, and the filter is blocked in serious cases. The common cleaning mode is disassembly cleaning, and the inner filter element is directly taken out to manually scrub the surface of the filter element. But the cleaning mode is inconvenient to disassemble and wastes a large amount of time and labor. Therefore, more and more filters adopt self-cleaning structures, the common back-washing system and the rotary scraping strip directly wash the surface of the filter screen, and although the automatic cleaning of the filters is realized, the conventional automatic washing mechanism has insufficient washing force on the filter screen, so that the cleaning effect is poor.

In order to solve the defects of the prior art, people have long searched for and put forward various solutions. For example, the chinese patent publication discloses a self-cleaning pre-filter [201811115562.5], which comprises an upper cylinder and a lower cylinder cooperating with each other, wherein a sealed chamber is formed between the upper cylinder and the lower cylinder, a water inlet communicating with the chamber is opened at the upper part of the upper cylinder, a filtering device is arranged in the chamber, the chamber is divided into a clean water chamber and a sewage chamber, the clean water chamber is connected with a clean water inlet, the sewage chamber is connected with a sewage outlet, and a cleaning device is further arranged on the filtering device, and the cleaning device can rotate around the filtering device and clean the filtering device.

The problem of the automatic clearance of filter has been solved to a certain extent to above-mentioned scheme, but this scheme still has a lot of not enough, and for example the dynamics of washing is little, and cleaning performance is relatively poor scheduling problem.

Disclosure of Invention

The utility model aims at the above-mentioned problem, a reasonable in design is provided, leading filter's that cleaning performance is good twin turbine washs structure.

In order to achieve the above purpose, the utility model adopts the following technical proposal: this leading filter's twin turbine washs structure, the setting is in the filter casing, the filter casing upper end has the water inlet, the lower extreme has the drain, including setting up the filter core barrel that just circumference has the filter screen in the filter casing, filter core barrel week is equipped with the filtration support body to the outside cover, and form former water cavity between filter screen circumference outside and the filter casing circumference inboard, filter support body for filter core barrel circumferential direction and axial positioning, it has the last turbine assembly who is used for being linked together water inlet and former water cavity to filter support body upper end, the lower extreme has the lower turbine assembly who is used for being linked together former water cavity and drain, and go up turbine assembly and/or turbine assembly down and filter the linkage of support body, have the slant water conservancy diversion mechanism that is located between turbine assembly and the lower turbine assembly and towards the filter screen circumference outside in filtration support body circumference. Go up turbine subassembly and turbine subassembly down and drive the relative filter core barrel the central axis rotation of slant water conservancy diversion mechanism on the filter support body under the rivers effect, will compress rivers and extrude filter core barrel surface, cause pressure to wash the filter core barrel, later discharge sewage from the drain, effectively solved the drawback of scraping the strip and scrubbing the filter screen and bring the tiny impurity brush into the filter screen. And meanwhile, the double-turbine pressurizing device is arranged, so that the filter frame body has higher rotating speed, the larger flushing force is improved, and a better cleaning effect is achieved.

In foretell leading filter's twin-turbine washs structure, slant water conservancy diversion mechanism includes a plurality of settings at the water conservancy diversion muscle of filtering support body week outside, and the water conservancy diversion muscle distributes in filter screen circumference periphery, all has the inclined plane formula water conservancy diversion subassembly towards the filter screen on the water conservancy diversion muscle. The plurality of flow guide ribs rotate and are matched with the inclined plane type flow guide assembly to provide centrifugal force for the flowing water body, so that the flow guide ribs can carry out vortex type stirring relative to the central axis of the filter.

In foretell leading filter's two turbine cleaning structure, the equal vertical setting of water conservancy diversion muscle and integrative being formed into in the filter frame body week outside, and each water conservancy diversion muscle evenly distributed sets up, and inclined plane formula water conservancy diversion subassembly is the slope water conservancy diversion inclined plane that forms in water conservancy diversion muscle one side, and the slope water conservancy diversion inclined plane evenly distributed of each water conservancy diversion muscle just all sets up towards the filter screen slope in the filter screen circumference outside. The inclined diversion inclined plane is obliquely arranged relative to the radial direction of the filter frame body and rotates along with the rotation of the upper turbine assembly and the lower turbine assembly, and the inclined diversion inclined plane is not in direct contact with the filter element cylinder body and cannot damage the surface of the filter element cylinder body during rotation.

In the double-turbine cleaning structure of the pre-filter, the upper end of the filter element cylinder is provided with a flow guide disc body, the circumferential outer side of the flow guide disc body and the circumferential inner side of the opening at the upper end of the filtering cup body of the filter shell are mutually abutted and sealed, and the flow guide disc body is provided with an inclined flow guide assembly corresponding to the upper turbine assembly. The water flow input from the water inlet is guided to the upper turbine assembly by the diversion disc body, so that the rotation driving force is provided for the upper turbine assembly, and an external driving mechanism is not needed.

In foretell leading filter's twin-turbine washs structure, slope water conservancy diversion subassembly includes that a plurality of circumference evenly set up the slope water conservancy diversion hole on the water conservancy diversion disk body, and each slope water conservancy diversion hole homodromous slope sets up and runs through the water conservancy diversion disk body, and slope water conservancy diversion hole upper end all is linked together with the water inlet, and the lower extreme is towards turbine subassembly. The inclined diversion assembly concentrates the water pressure on the upper turbine assembly, and the water pressure utilization rate is improved.

In foretell leading two turbines of filter wash structure, go up the turbine subassembly including the cover locate filter core barrel upper end circumference outside and be located water conservancy diversion disk body lower extreme and filter the last turbine seat between the support body upper end, go up turbine seat and water conservancy diversion disk body circumferential direction setting and go up turbine seat and filter support body mutual positioning, it is the tube-shape and upper end circumference outside to go up the turbine seat and has the last turbine ring body that sets up with last turbine seat is concentric, it is a plurality of last turbine blades that are arc and evenly distributed and syntropy slope setting to be equipped with between last turbine ring body circumference inside and last turbine seat circumference outside, it is used for the last water conservancy diversion passageway of slope water conservancy diversion hole and former water cavity intercommunication to form between two adjacent last turbine blades. The upper turbine blade of the upper turbine assembly is opposite to the inclined diversion hole on the diversion disc body, and the rotation driving force is provided for the water body when the water body flows, so that the high-speed stable operation of the water body is ensured.

In the two turbine cleaning structures of foretell leading filter, go up the turbine seat lower extreme and peg graft in filtering frame body upper end circumference inboard, and go up the turbine seat circumference outside and have a plurality of downwardly extending setting go up the location arch, filter frame body upper end has a plurality of last constant head tanks with the protruding one-to-one in last location, and goes up the location arch and peg graft respectively in last constant head tank. The upper positioning bulge corresponds to the upper positioning groove, limits the axial positions of the upper turbine seat and the filtering frame body, and has good connection stability.

In foretell leading two turbines of filter washs the structure, lower turbine subassembly is located the lower turbine seat of filtering the support body lower extreme including the cover, lower turbine seat and filtering the support body mutual positioning, lower turbine seat is the tube-shape and circumference outside has the lower turbine ring body that sets up with lower turbine seat is concentric, be equipped with a plurality ofly between the circumference inside side of lower turbine ring body and the circumference outside of lower turbine seat and be arc and evenly distributed and with the lower turbine blade that last turbine blade syntropy slope set up, form between two adjacent lower turbine blades and be used for the lower water conservancy diversion passageway with former water cavity and drain intercommunication. Lower turbine assembly realizes and the secondary pressure boost when the water flows out from the sewage mouth, further improves the slew rate of filter holder body.

In the double-turbine cleaning structure of the front filter, the lower turbine seat is provided with a lower turbine annular groove on the inner circumferential side, the outer circumferential side of the lower end of the filter frame body is provided with a positioning convex ring which is connected with the lower turbine annular groove in a clamped mode, the inner circumferential side of the lower turbine seat is provided with a plurality of lower positioning bulges which are vertically arranged, the lower end of the filter frame body is provided with a plurality of lower positioning grooves which correspond to the lower positioning bulges in a one-to-one mode, and the lower positioning bulges are respectively inserted into the lower positioning grooves. The lower turbine ring groove is clamped with the positioning convex ring, the lower positioning bulge is inserted into the lower positioning groove, and the axial and circumferential positions of the filtering frame body and the lower turbine seat are kept fixed.

In the double-turbine cleaning structure of the front filter, the circumferential inner side of the lower end of the lower turbine seat is provided with the frame body base, the lower end of the filtering frame body is abutted against the frame body base, the movable valve rod extending into the filter element cylinder body penetrates through the frame body base, and the valve rod limiting parts on the lower end of the frame body base and the movable valve rod are axially positioned. The valve rod limiting part is matched with the movable valve rod and used for limiting the axial positions of the filter element cylinder and the filter frame body, the filter frame body is guaranteed to rotate at the axial fixed position relative to the filter element cylinder, and the filter frame body is prevented from falling off.

Compared with the prior art, the utility model has the advantages of: the upper turbine assembly and the lower turbine assembly drive the filter frame body to rotate under the action of water flow, the inclined flow guide mechanism on the side surface of the filter frame body compresses water flow to the filter element cylinder body to wash the surface of the filter element cylinder body, and the double-turbine structure provides larger torque for the inclined flow guide mechanism and has better washing effect; filter support body, go up turbine subassembly and turbine subassembly fixed connection down and retrain its relative filter core barrel's axial position by the spacing portion of valve rod, have better structural stability.

Drawings

FIG. 1 is a sectional view of the structure of the present invention;

fig. 2 is a schematic structural view of the filter housing of the present invention;

FIG. 3 is a schematic assembly view of the present invention;

in the figure, the filter comprises a filter housing 1, a water inlet 11, a sewage discharge outlet 12, a raw water cavity 13, a filter cup body 14, a filter element cylinder 2, a filter screen 21, a deflector body 22, a filter frame body 3, an upper turbine assembly 4, an upper turbine seat 41, an upper turbine ring body 42, an upper turbine blade 43, an upper diversion channel 44, an upper positioning bulge 45, an upper positioning groove 46, a lower turbine assembly 5, a lower turbine seat 51, a lower turbine ring body 52, a lower turbine blade 53, a lower diversion channel 54, a lower turbine annular groove 55, a positioning convex ring 56, a lower positioning bulge 57, a lower positioning groove 58, an inclined diversion mechanism 6, a diversion rib 61, an inclined diversion assembly 62, an inclined diversion slope 63, an inclined diversion assembly 7, an inclined diversion hole 71, a frame body base 8, a movable valve rod 81 and a valve rod limiting part 82.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-3, the double-turbine cleaning structure of the pre-filter is arranged in a filter housing 1, a water inlet 11 is arranged at the upper end of the filter housing 1, a sewage outlet 12 is arranged at the lower end of the filter housing, the filter housing comprises a filter core barrel 2 which is arranged in the filter housing 1 and is circumferentially provided with a filter screen 21, a filter frame body 3 is sleeved on the circumferential outer side of the filter core barrel 2, a raw water cavity 13 is formed between the circumferential outer side of the filter screen 21 and the circumferential inner side of the filter housing 1, the filter frame body 3 rotates circumferentially and is axially positioned relative to the filter core barrel 2, an upper turbine assembly 4 for communicating the water inlet 11 with the raw water cavity 13 is arranged at the upper end of the filter frame body 3, a lower turbine assembly 5 for communicating the raw water cavity 13 with the sewage outlet 12 is arranged at the lower end of the filter frame body, and the upper turbine assembly 4 and/or the lower turbine assembly 5 are linked with the filter frame body 3, and an oblique flow guide mechanism 6 which is arranged between the upper turbine assembly 4 and the lower turbine assembly 5 and faces the circumferential outer side of the filter screen 21 is arranged in the circumferential direction of the filter frame body 3. During the washing, the water gets into from water inlet 11, provides the torque for it when going up turbine assembly 4 to the relative filter core barrel 2 of filtration support body 3 that turbine assembly 4 connected rotates in the drive, and the water provides a torque once more through turbine assembly 5 down, further improves the rotational speed of filtering support body 3. The inclined flow guide mechanism 6 on the side surface of the filter frame body 3 is not contacted with the filter screen 21 of the filter element cylinder body 2 in the rotating process, and generates vortex-type extrusion water flow to the filter screen 21 when rotating, so that fine impurities on the surface of the filter screen 21 are flushed out and discharged from the sewage outlet 12.

Specifically, slant water conservancy diversion mechanism 6 includes a plurality of water conservancy diversion muscle 61 that set up in the 3 circumference outsides of filter frame body, and water conservancy diversion muscle 61 distributes in filter screen 21 circumference periphery, all has the inclined plane formula water conservancy diversion subassembly 62 towards filter screen 21 on the water conservancy diversion muscle 61. The flow guiding ribs 61 of the oblique flow guiding mechanism 6 and the filter frame body 3 are of an integrated structure, and the inclined plane type flow guiding assemblies 62 on the flow guiding ribs 61 guide water flow to change from linear motion to spiral motion.

Deeply, the equal vertical setting of water conservancy diversion muscle 61 and the integrative 3 circumference outsides in filtering the support body, and each water conservancy diversion muscle 61 evenly distributed sets up, and inclined plane formula water conservancy diversion subassembly 62 is for forming in the slope water conservancy diversion inclined plane 63 of water conservancy diversion muscle 61 one side, and the slope water conservancy diversion inclined plane 63 evenly distributed of each water conservancy diversion muscle 61 just all inclines towards filter screen 21 and sets up in the filter screen 21 circumference outside. The inner side and the outer side of the flow guiding rib 61 are provided with inclined flow guiding inclined planes 63, and the inclined flow guiding inclined planes 63 on the inner side form pressure difference when rotating, so that the water flow is guided to rotate.

Furthermore, the upper end of the filter element cylinder 2 is provided with a flow guide disc body 22, the circumferential outer side of the flow guide disc body 22 and the circumferential inner side of the upper opening of the filtering cup body 14 of the filter shell 1 are mutually abutted and sealed, and the flow guide disc body 22 is provided with an inclined flow guide assembly 7 corresponding to the upper turbine assembly 4. The diversion tray body 22 can be opened and closed up and down to realize the direct communication between the water inlet 11 and the raw water cavity 13, thereby controlling the work of the double-turbine cleaning structure. After the diversion disc body 22 is sealed with the upper end opening of the filtering cup body 14, the input water flow is concentrated to the inclined diversion assembly 7, so that the rotation driving force of the upper turbine assembly 4 is increased.

Furthermore, the inclined diversion assembly 7 comprises a plurality of inclined diversion holes 71 which are circumferentially and uniformly arranged on the diversion disc body 22, each inclined diversion hole 71 is obliquely arranged in the same direction and penetrates through the diversion disc body 22, the upper ends of the inclined diversion holes 71 are communicated with the water inlet 11, and the lower ends of the inclined diversion holes face the upper turbine assembly 4. The inclined diversion holes 71 of the inclined diversion assembly 7 are right opposite to the upper turbine blades 43 of the upper turbine assembly 4, water flow is guided to enter the raw water cavity 13 from the water inlet 11, and the inclined diversion holes 71 are obliquely arranged and have higher water pressure utilization rate compared with the vertical arrangement.

Besides, the upper turbine assembly 4 includes an upper turbine seat 41 which is sleeved on the circumferential outer side of the upper end of the filter element cylinder 2 and is located between the lower end of the deflector body 22 and the upper end of the filter frame body 3, the upper turbine seat 41 and the deflector body 22 are arranged in a circumferential rotating manner, the upper turbine seat 41 and the filter frame body 3 are mutually positioned, the upper turbine seat 41 is cylindrical, the circumferential outer side of the upper end of the upper turbine seat is provided with an upper turbine ring body 42 which is concentrically arranged with the upper turbine seat 41, a plurality of upper turbine blades 43 which are arc-shaped and uniformly distributed and obliquely arranged in the same direction are arranged between the circumferential inner side of the upper turbine ring body 42 and the circumferential outer side of the upper turbine seat 41, and an upper flow guide channel 44 for communicating the oblique flow guide hole 71 and the raw water cavity 13 is formed between two adjacent upper turbine blades 43. The upper turbine seat 41 of the upper turbine assembly 4 rotates relative to the deflector body 22, and the upper turbine ring body 42 and the upper turbine seat 41 are arranged on the inner side and the outer side below the inclined deflector hole 71, so that the rotation of the upper turbine assembly 4 relative to the filter element cylinder body 2 is not influenced.

Simultaneously, go up the turbine seat 41 lower extreme and peg graft in 3 upper ends circumference inboards of filter frame body, and go up the turbine seat 41 circumference outside and have a plurality of downwardly extending set up go up the location arch 45, filter frame body 3 upper end have a plurality of with last location arch 45 one-to-one go up constant head tank 46, and go up the location arch 45 and peg graft respectively in last constant head tank 46. The upper positioning protrusion 45 is matched with the upper positioning groove 46 to fixedly connect the upper turbine seat 41 with the filter frame body 3.

Visibly, the lower turbine assembly 5 comprises a lower turbine seat 51 sleeved at the lower end of the filter frame body 3, the lower turbine seat 51 and the filter frame body 3 are mutually positioned, the lower turbine seat 51 is cylindrical, a lower turbine ring body 52 concentrically arranged with the lower turbine seat 51 is arranged on the circumferential outer side, a plurality of lower turbine blades 53 which are arc-shaped and evenly distributed and are obliquely arranged in the same direction as the upper turbine blades 43 are arranged between the circumferential inner side of the lower turbine ring body 52 and the circumferential outer side of the lower turbine seat 51, and a lower flow guide channel 54 for communicating the raw water cavity 13 with the sewage discharge port 12 is formed between every two adjacent lower turbine blades 53. The lower turbine blades 53 of the lower turbine base 51 are impacted by water flow when water enters the sewage draining outlet 12 from the raw water cavity 13, and are matched with the upper turbine assembly 4 to respectively provide equidirectional torque for the upper end and the lower end of the filter frame body 3.

Obviously, the circumferential inner side of the lower turbine seat 51 is provided with a lower turbine annular groove 55, the circumferential outer side of the lower end of the filter frame body 3 is provided with a positioning convex ring 56 which is clamped in the lower turbine annular groove 55, the circumferential inner side of the lower turbine seat 51 is also provided with a plurality of vertically arranged lower positioning protrusions 57, the lower end of the filter frame body 3 is provided with a plurality of lower positioning grooves 58 which are in one-to-one correspondence with the lower positioning protrusions 57, and the lower positioning protrusions 57 are respectively inserted into the lower positioning grooves 58. The lower turbine annular groove 55 is clamped into the positioning convex ring 56 to limit the axial positions of the lower turbine seat 51 and the filter frame body 3, and the lower positioning bulge 57 is clamped with the lower positioning groove 58 to limit the circumferential angle of the lower turbine seat 51 and the filter frame body 3.

Preferably, lower turbine wheel seat 51 lower extreme circumference inboard has support body base 8, and filters support body 3 lower extreme and support and lean on support body base 8, and wears to be equipped with the movable valve rod 81 that extends to in the filter core barrel 2 in the support body base 8, and the spacing 82 axial positioning of valve rod on support body base 8 lower extreme and the movable valve rod 81. Lower turbine seat 51 is provided with the restraint mechanism of the relative filter core barrel 2 axial position of restriction filter support body 3, when guaranteeing to filter support body 3 normal pivoted, avoids filtering support body 3 relative filter core barrel 2 landing down.

In summary, the principle of the present embodiment is: go up turbine assembly 4 and turbine assembly 5 down and for the cover filter frame body 3 on filter core barrel 2 provides the torque, filter frame body 3 when rotating the slant guiding mechanism 6 of its side relative with filter screen 21 on the filter core barrel 2, produce extrusion rivers towards filter screen 21 to take away the impurity of adhering to on filter screen 21 surface.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the filter housing 1, the water inlet 11, the sewage discharge outlet 12, the raw water chamber 13, the filter cup body 14, the filter cartridge body 2, the filter screen 21, the deflector body 22, the filter frame body 3, the upper turbine assembly 4, the upper turbine base 41, the upper turbine ring body 42, the upper turbine blades 43, the upper deflector channel 44, the upper positioning protrusion 45, the upper positioning groove 46, the lower turbine assembly 5, the lower turbine base 51, the lower turbine ring body 52, the lower turbine blades 53, the lower deflector channel 54, the lower turbine annular groove 55, the positioning convex ring 56, the lower positioning protrusion 57, the lower positioning groove 58, the oblique deflector mechanism 6, the deflector rib 61, the inclined-plane deflector assembly 62, the inclined deflector slope 63, the inclined deflector assembly 7, the inclined deflector hole 71, the frame body base 8, the movable valve stem 81, the valve stem stopper 82, and the like are used more often, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a two turbine cleaning structure of leading filter, sets up in filter housing (1), filter housing (1) upper end water inlet (11) have, the lower extreme has drain (12), including setting up filter core barrel (2) that just circumference has filter screen (21) in filter housing (1), filter core barrel (2) circumference outside cover be equipped with and filter frame body (3), just filter screen (21) circumference outside and filter housing (1) circumference between form former water cavity (13), its characterized in that, filter frame body (3) for filter core barrel (2) circumferential direction and axial positioning, filter frame body (3) upper end have and be used for the last turbine subassembly (4) that are linked together water inlet (11) and former water cavity (13), the lower extreme has and is used for turbine subassembly (5) down that are linked together former water cavity (13) and drain (12), and the upper turbine assembly (4) and/or the lower turbine assembly (5) are/is linked with the filtering frame body (3), and an inclined flow guide mechanism (6) which is positioned between the upper turbine assembly (4) and the lower turbine assembly (5) and faces the circumferential outer side of the filter screen (21) is arranged in the circumferential direction of the filtering frame body (3).

2. The twin-turbine washing structure of the pre-filter according to claim 1, wherein the inclined flow guide mechanism (6) comprises a plurality of flow guide ribs (61) arranged on the circumferential outer side of the filter frame body (3), the flow guide ribs (61) are distributed on the circumferential periphery of the filter screen (21), and the flow guide ribs (61) are provided with inclined flow guide components (62) facing the filter screen (21).

3. The twin-turbine washing structure of the pre-filter according to claim 2, wherein the flow guiding ribs (61) are vertically arranged and integrally formed on the circumferential outer side of the filter frame body (3), the flow guiding ribs (61) are uniformly distributed, the inclined flow guiding assembly (62) is an inclined flow guiding inclined plane (63) formed on one side of the flow guiding ribs (61), and the inclined flow guiding inclined plane (63) of each flow guiding rib (61) is uniformly distributed on the circumferential outer side of the filter screen (21) and is obliquely arranged towards the filter screen (21).

4. The twin-turbine washing structure of the pre-filter as set forth in claim 1, 2 or 3, wherein the filter cartridge body (2) has a deflector body (22) at an upper end thereof, a circumferential outer side of the deflector body (22) and an open circumferential inner side of an upper end of the filter bowl (14) of the filter housing (1) abut against and are sealed with each other, and an inclined deflector assembly (7) corresponding to the upper turbine assembly (4) is provided on the deflector body (22).

5. The twin-turbine washing structure of the pre-filter as set forth in claim 4, wherein the inclined guide assembly (7) comprises a plurality of inclined guide holes (71) uniformly arranged on the guide disc body (22) in the circumferential direction, each inclined guide hole (71) is obliquely arranged in the same direction and penetrates through the guide disc body (22), the upper ends of the inclined guide holes (71) are communicated with the water inlet (11), and the lower ends of the inclined guide holes face the upper turbine assembly (4).

6. The twin-turbine washing structure of the pre-filter according to claim 5, wherein the upper turbine assembly (4) comprises an upper turbine seat (41) which is sleeved on the circumferential outer side of the upper end of the filter element cylinder (2) and is positioned between the lower end of the guide disc body (22) and the upper end of the filter frame body (3), the upper turbine seat (41) and the guide disc body (22) are arranged in a circumferential rotating manner, the upper turbine seat (41) and the filter frame body (3) are mutually positioned, the upper turbine seat (41) is cylindrical, the circumferential outer side of the upper end of the upper turbine seat is provided with an upper turbine ring body (42) which is concentrically arranged with the upper turbine seat (41), a plurality of upper turbine blades (43) which are arc-shaped and uniformly distributed and obliquely arranged in the same direction are arranged between the circumferential inner side of the upper turbine ring body (42) and the circumferential outer side of the upper turbine seat (41), and an upper guide channel (44) for communicating the inclined guide hole (71) with the raw water chamber (13) is formed between two adjacent upper turbine blades (43).

7. The twin-turbine washing structure of the prefilter of claim 6 wherein the lower end of the upper turbine holder (41) is inserted inside the circumferential direction of the upper end of the filter frame body (3), and the circumferential outside of the upper turbine holder (41) is provided with a plurality of upper positioning protrusions (45) extending downward, the upper end of the filter frame body (3) is provided with a plurality of upper positioning grooves (46) corresponding to the upper positioning protrusions (45) one by one, and the upper positioning protrusions (45) are respectively inserted into the upper positioning grooves (46).

8. The twin-turbine washing structure of the pre-filter according to claim 6, wherein the lower turbine assembly (5) comprises a lower turbine seat (51) sleeved at the lower end of the filter frame body (3), the lower turbine seat (51) and the filter frame body (3) are mutually positioned, the lower turbine seat (51) is cylindrical, a lower turbine ring body (52) concentrically arranged with the lower turbine seat (51) is arranged on the circumferential outer side of the lower turbine seat (51), a plurality of lower turbine blades (53) which are arc-shaped and uniformly distributed and are obliquely arranged in the same direction as the upper turbine blades (43) are arranged between the circumferential inner side of the lower turbine ring body (52) and the circumferential outer side of the lower turbine seat (51), and a lower flow guide channel (54) for communicating the raw water cavity (13) with the sewage discharge port (12) is formed between two adjacent lower turbine blades (53).

9. The twin-turbine washing structure of the pre-filter according to claim 8, wherein the lower turbine seat (51) is provided with a lower turbine annular groove (55) on the circumferential inner side, the filtering frame body (3) is provided with a positioning convex ring (56) on the circumferential outer side of the lower end which is clamped in the lower turbine annular groove (55), a plurality of vertically arranged lower positioning protrusions (57) are further arranged on the circumferential inner side of the lower turbine seat (51), the lower end of the filtering frame body (3) is provided with a plurality of lower positioning grooves (58) which are in one-to-one correspondence with the lower positioning protrusions (57), and the lower positioning protrusions (57) are respectively inserted into the lower positioning grooves (58).

10. The twin-turbine washing structure of the pre-filter according to claim 8, wherein the lower turbine seat (51) has a frame base (8) on the inner side in the circumferential direction of the lower end thereof, the lower end of the filter frame (3) abuts against the frame base (8), a movable valve rod (81) extending into the filter cartridge body (2) is arranged in the frame base (8) in a penetrating manner, and the lower end of the frame base (8) and a valve rod limiting part (82) on the movable valve rod (81) are axially positioned.