A pre-filter

Abstract

The present invention discloses a pre-filter, comprising an exoskeleton, a bottle body and a filter screen arranged inside the exoskeleton, wherein the exoskeleton is provided with a plurality of scraping strips for scraping off impurities on the inner wall of the bottle body and the filter screen, and further comprising a rotation drive assembly connected to the exoskeleton, through which the exoskeleton is driven to rotate so that the scraping strips scrape off impurities on the inner wall of the bottle body and the filter screen. The above-mentioned pre-filter can not only avoid the problem that the structure of product parts is easily damaged due to improper manual scraping operation, thereby affecting the normal use of the pre-filter, but also improve the efficiency of cleaning, reduce the intensity of manual labor, and reduce production costs.

Description

Technical Field

[0001] The invention relates to the technical field of filtering equipment, in particular to a pre-filter. Background Art

[0002] At present, the pre-filter is the first coarse filtration equipment for the whole house water. It can filter the mud, rust, large particles, etc. in the tap water, so as to prevent the large amount of precipitated impurities generated in the urban and community water supply network from causing harm to the human body, and play an active pre-protective role for concealed pipes, faucets, water heating, water heaters, boilers, central air conditioners, washing machines, dishwashers, coffee machines and other water appliances (water purifiers, pure water machines, water dispensers), etc. However, the impurities on the scrapable pre-filter filter bottle often need to be manually scraped and washed for sewage discharge, which is inconvenient to operate manually, and improper operation is easy to damage the structure of the product parts, thus affecting the normal use of the pre-filter.

[0003] Therefore, how to avoid the inconvenience of manual scraping and sewage discharge operation is a technical problem that technicians in this field currently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a pre-filter which can solve the problem of inconvenient manual scraping and sewage discharge operation and improve the scraping efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides a pre-filter, including an exoskeleton, a bottle body and a filter screen arranged on the inner side of the exoskeleton, the exoskeleton is provided with a plurality of scraping bars for scraping off impurities on the inner wall of the bottle body and the filter screen, and also includes a rotating drive component connected to the exoskeleton, and the exoskeleton is driven to rotate by the rotating drive component so that the scraping bars scrape off impurities on the inner wall of the bottle body and the filter screen.

[0006] Optionally, the rotary drive assembly includes an impeller and a plurality of blades distributed along the circumference of the impeller, the impeller is connected to the exoskeleton via a rotating shaft, and the impeller drives the rotating shaft and the exoskeleton to rotate by the water flow hitting the blades.

[0007] Optionally, a sewage and water outlet component and a sealing plate for supporting the rotating shaft are provided below the outer frame, and the impeller and all the blades are arranged inside the sewage and water outlet component.

[0008] Optionally, the sewage outlet is provided with an outlet hole and a guide channel for guiding the water flow. Guided by the guide channel, the water flows out along the outlet hole to hit the blade in a direction.

[0009] Optionally, the rotating shaft is provided with an extension portion extending radially outwardly for carrying the impeller, and the sealing plate is provided with an annular support portion for contacting and abutting against a bottom surface of the extension portion.

[0010] Optionally, it also includes a fixing frame threadedly connected to the sewage outlet, and the fixing frame and the sewage outlet are screwed together through threads to fix the sealing plate located between the sewage outlet and the fixing frame.

[0011] Optionally, an inner frame for mounting the filter is provided on the inner side of the outer frame, a booster is provided on the inner side of the inner frame, and the booster is provided with a plurality of booster holes for adjusting the outlet water pressure to enhance the flushing effect.

[0012] Optionally, all of the boosting holes are oblique water outlet holes, and when water is discharged, the water flow impacts the inner wall of the oblique water outlet hole to drive the boosting component to rotate.

[0013] Optionally, the number of the scraping bars is two, and the outer frame is provided with two scraping bar grooves for installing the two scraping bars respectively and two scraping bar covers for preventing the two scraping bars from falling out when scraping the filter screen.

[0014] Optionally, the scraper bar is an integrally formed silicone scraper bar or an integrally formed brush.

[0015] Compared with the above background technology, the pre-filter provided in the embodiment of the present invention includes an exoskeleton, a bottle body, a filter screen and a rotary drive assembly. The filter screen is arranged on the inner side of the exoskeleton. The exoskeleton is provided with a plurality of scraping strips. The scraping strips are used to scrape off impurities on the inner wall of the bottle body and the filter screen. The rotary drive assembly is connected to the exoskeleton. The rotary drive assembly is used to drive the exoskeleton to rotate. The exoskeleton and the scraping strips are driven to rotate by the rotary drive assembly so that the scraping strips scrape off impurities on the inner wall of the bottle body and the filter screen. It can be seen that the above pre-filter achieves the purpose of scraping off impurities on the outer surface of the filter screen and the inner wall of the bottle body by setting a rotary drive assembly and driving the exoskeleton and the scraping strips to rotate by the rotary drive assembly, thereby solving the problem of inconvenience in manual scraping and washing in the prior art. Compared with manual scraping, the above setting method can not only avoid the problem that the structure of the product parts is easily damaged due to improper manual scraping operation, thereby affecting the normal use of the pre-filter, but also improve the efficiency of cleaning, reduce the labor intensity and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a pre-filter provided in an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Structural schematic diagram of the intermediate water channel conversion component;

[0019] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the middle plug;

[0020] Figure 4 for Figure 1 Schematic diagram of the structure of the middle water distributor;

[0021] Figure 5 for Figure 1 Schematic diagram of the structure of the middle bottle body;

[0022] Figure 6 for Figure 1 Schematic diagram of the assembly structure of the middle water distributor and the bottle body;

[0023] Figure 7 for Figure 1 Schematic diagram of the assembly structure of the inner frame, the booster and the cover;

[0024] Figure 8 for Figure 1 Schematic diagram of the assembly structure of the middle and outer frame, scraper bar and scraper bar cover;

[0025] Fig. 9 for Figure 1 Schematic diagram of the structure of the meso-exo-skeleton;

[0026] Fig.10 for Figure 1 A schematic diagram of the structure of the meso-exoskeleton from another angle;

[0027] Fig.11 for Figure 1 The structural diagram of the middle booster;

[0028] Fig.12 for Figure 1 A schematic structural diagram of the middle booster from another angle;

[0029] Fig.13 for Figure 1 A schematic diagram of the structure of the middle cover;

[0030] Fig.14 for Figure 1 Structural diagram of the sewage outlet parts;

[0031] Fig.15 for Figure 1 Schematic diagram of the assembly structure of the inner and outer skeletons, connecting rods, rotating shafts, impellers and sewage outlet parts;

[0032] Fig.16 for Figure 1 Schematic diagram of the structure of the transfer shaft

[0033] Fig.17 for Figure 1 Schematic diagram of the structure of the middle impeller;

[0034] Fig.18 for Figure 1 Schematic diagram of the assembly structure of the water channel conversion part, plug, connecting rod and piston;

[0035] Fig.19 for Figure 1 Schematic diagram of the assembly structure of the sewage outlet, sealing plate, fixing frame and sealing member;

[0036] Fig. 20 for Figure 1 A schematic diagram of the structure of the middle fixing frame;

[0037] Fig.21 A schematic diagram of water flow in a filtering state of the pre-filter provided by an embodiment of the present invention;

[0038] Fig. 22 A schematic diagram of water flow of a pre-filter in a backwash state provided by an embodiment of the present invention.

[0039] in:

[0040] 1-valve head, 2-backwash frame, 3-water channel conversion part, 301-external thread, 4-water distributor, 401-limiting rib, 402-card slot, 403-inclined guide surface, 5-inner frame, 501-protrusion, 502-convex rib, 6-external frame, 601-center hole, 602-scraper groove, 603-scraper, 604-scraper cover, 7-bottle body, 701-limiting groove, 8-boosting part, 801-boosting hole, 802-notch, 9-seal Cover, 901- buckle, 10- plug, 1001- internal thread, 11- nut, 12- sewage outlet, 1201- outlet hole, 1202- guide channel, 13- sealing plate, 14- backwash spring, 15- connecting rod, 16- rotating shaft, 17- impeller, 1701- blade, 18- piston, 1801- stress surface, 1802- lower end surface, 19- seal, 20- drain ball valve, 21- fixing bracket, 2101- bayonet. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The core of the present invention is to provide a pre-filter, which can solve the problem of inconvenient manual scraping and sewage discharge operation and improve the scraping efficiency.

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] It should be noted that the directional words such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0045] like Figure 1 As shown, the pre-filter provided in the embodiment of the present invention includes a drain ball valve 20, a bottle body 7 and a scraping filter element structure arranged in the bottle body 7. A seal 19 is installed at the lower end of the bottle body 7, and a drain ball valve 20 is installed at the lower end of the seal 19 for draining sewage.

[0046] The scraping and washing filter element structure includes an exoskeleton 6, a filter screen and a rotating drive component. The exoskeleton 6 is arranged on the inner side of the bottle body 7, and the filter screen is arranged on the inner side of the exoskeleton 6. The exoskeleton 6 is provided with a plurality of scraping strips 603. The scraping strips 603 are used to scrape off impurities on the inner wall of the bottle body 7 and the filter screen. The rotating drive component is connected to the exoskeleton 6. The rotating drive component is used to drive the exoskeleton 6 to rotate. The exoskeleton 6 and the scraping strips 603 are driven to rotate by the rotating drive component so that the scraping strips 603 scrape off impurities on the inner wall of the bottle body 7 and the filter screen.

[0047] According to actual needs, the number of the scraper strips 603 is preferably set to two. Correspondingly, the exoskeleton 6 is provided with two scraper strip grooves 602 and two scraper strip covers 604. The two scraper strip grooves 602 are arranged in one-to-one correspondence with the two scraper strips 603. The scraper strip grooves 602 are used to install the scraper strips 603. The scraper strip covers 604 are buckled onto the exoskeleton 6. The scraper strip covers 604 are used to prevent the scraper strips 603 from falling out when scraping the filter.

[0048] Of course, the scraper bar 603 is an integrally formed silicone scraper bar or an integrally formed brush. Obviously, the silicone scraper bar or the brush is elastic and is a soft scraper bar. During the scraping and washing process, the scraper bar 603 contacts and resists the inner wall of the bottle body 7 and the surface of the filter screen, and the elastic deformation of the scraper bar 603 is utilized to maximize the effect of removing impurities.

[0049] It can be seen that the above-mentioned pre-filter is provided with a rotary drive component, and the rotary drive component drives the outer frame 6 and the scraper bar 603 to rotate, so as to scrape away impurities on the outer surface of the filter screen and the inner wall of the bottle body 7, thereby solving the problem of inconvenient operation of manual scraping and washing in the prior art. Compared with manual scraping, the above-mentioned setting method can not only avoid the problem that the structure of product parts is easily damaged due to improper manual scraping operation, thereby affecting the normal use of the pre-filter, but also improve the efficiency of cleaning, reduce manual labor intensity, and reduce production costs.

[0050] Furthermore, the above-mentioned rotation drive component can be specifically configured to include an impeller 17 and a plurality of blades 1701 evenly distributed along the circumference of the impeller 17. The impeller 17 is connected to the exoskeleton 6 via a rotating shaft 16. The water flow hits the blades 1701 so that the impeller 17 drives the rotating shaft 16 and the exoskeleton 6 to rotate.

[0051] The exoskeleton 6 is interference fit with the rotating shaft 16. The exoskeleton 6 is provided with a center hole 601 at the bottom, and the center hole 601 is used to cooperate with the rotating shaft 16. The inner wall of the center hole 601 has two straight edges, which are used to correspond to the two straight outer walls of the rotating shaft 16. In this way, when the rotating shaft 16 rotates, the exoskeleton 6 can be driven to rotate together. In addition, a nut 11 is also connected to the top of the rotating shaft 16 to achieve axial limit.

[0052] Furthermore, a sewage outlet 12, a sealing plate 13 and a fixing frame 21 are provided below the outer frame 6, wherein the fixing frame 21 is threadedly connected to the sewage outlet 12, and the fixing frame 21 is screwed together with the sewage outlet 12 to fix the sealing plate 13 located between the sewage outlet 12 and the fixing frame 21; the sealing plate 13 is used to support the rotating shaft 16, and the impeller 17 and all blades 1701 are arranged inside the sewage outlet 12, the impeller 17 is sleeved on the rotating shaft 16, the rotating shaft 16 is provided with an extension portion extending radially outward and used to support the impeller 17, and the sealing plate 13 is provided with an annular support portion. When assembled, the top surface of the annular support portion contacts and abuts against the bottom surface of the extension portion to achieve a supporting effect, thereby achieving axial limiting.

[0053] Specifically, the sewage outlet 12 is provided with a water outlet hole 1201 and a guide channel 1202. Two water outlet holes 1201 can be provided. The guide channel 1202 is used to guide the water flow. The water flow is guided by the guide channel 1202 and is guided out along the water outlet hole 1201 to achieve the purpose of directional hitting the blades 1701. It should be noted that due to the inertia of the guide channel 1202, the water flow can still rotate clockwise after flowing out of the water outlet hole 1201, so that the water flow can hit the uniformly distributed blades 1701 on the impeller 17 in a predetermined direction. When the water flow hits the blades 1701, it will drive the impeller 17 to rotate.

[0054] On the basis of the above, an inner frame 5 is arranged on the inner side of the outer frame 6, and a filter screen is installed on the inner frame 5. The filter screen can be a stainless steel filter screen. The inner frame 5 can prevent the stainless steel filter screen from being deformed or flattened under the action of water pressure; at the same time, a water path conversion component 3 is designed inside the inner frame 5, which can be used to switch the water path when discharging sewage to achieve the effect of backwashing; a booster component 8 is also arranged on the inner side of the inner frame 5, and the booster component 8 is arranged between the water path conversion component 3 and the inner frame 5, and the booster component 8 is provided with a plurality of booster holes 801 for adjusting the outlet water pressure to enhance the flushing effect.

[0055] Preferably, there are three boosting holes 801 on the left and right sides of the boosting member 8, and their function is to reduce the area of ​​the water outlet when the water flow rate is equal, so as to increase the water pressure of the water outlet, thereby achieving a better flushing effect.

[0056] In order to further improve the flushing effect, all the boosting holes 801 are oblique water outlet holes. When water is discharged, the water flow impacts the inner wall of the oblique water outlet hole to drive the boosting component 8 to rotate 360°, so as to ensure that the filter screen can be flushed 360° without leaving any dead corners.

[0057] In addition, the booster 8 is also connected to the cover 9. Specifically, two symmetrical notches 802 are provided at the front and rear of the booster 8. The two notches 802 are used to buckle with two symmetrical buckles 901 on the cover 9, so that the booster 8 is connected to the cover 9. Correspondingly, in order to prevent the booster 8 and the cover 9 from moving up and down, the inner frame 5 has two protrusions 501, which press the cover 9. Since the cover 9 and the booster 8 are snap-fitted, the booster 8 is indirectly pressed while pressing the cover 9, so that the booster 8 and the cover 9 can be prevented from moving up and down when switching between the filtering and the clean water backwashing states.

[0058] More specifically, an O-ring is provided at the upper end of the water channel conversion member 3, which can prevent water from flowing into the water purification area from the gap between the water channel conversion member 3 and the inner frame 5 during filtration, thereby affecting the filtration effect; a plug 10 is threadedly connected to the lower end of the water channel conversion member 3, and the plug 10 is connected to the piston 18 through a connecting rod 15. The bottom of the water channel conversion member 3 is provided with an external thread 301, which is screwed with an internal thread 1001 on the plug 10 to achieve the connection between the water channel conversion member 3 and the plug 10. By moving the water channel conversion member 3 up and down, the two states of water channel filtration and water purification backwashing can be switched.

[0059] In addition, a silicone ring is installed at the groove of the piston 18, and the silicone ring is used to seal the gap between the fixing frame 21 and the piston 18, so that water can be prevented from flowing through the gap between the fixing frame 21 and the piston 18 during backwashing of purified water. In addition, two bayonet holes 2101 are provided on the fixing frame 21, and the two bayonet holes 2101 are buckled on the sealing member 19. The up and down movement of the piston 18 will drive the silicone ring installed thereon to move up and down together. There is a certain friction between the silicone ring and the inner wall of the fixing frame 21. The fixing frame 21 is buckled on the sealing member 19, and the fixing frame 21 will not be driven to move up and down due to the friction between the silicone ring and the fixing frame 21.

[0060] In this way, when water pressure acts on the force-bearing surface 1801 at the top of the piston 18, the piston 18 moves downward under the action of the water pressure. Since the plug 10 is connected to the piston 18 by the connecting rod 15, the plug 10 can drive the water channel conversion component 3 threadedly connected thereto to move downward together, so that the water channel conversion component 3 converts the filtering state into the clean water backwashing state.

[0061] It should be noted that a backwash skeleton 2 is provided on the outside of the water channel conversion component 3. When the water channel conversion component 3 moves downward, water can enter the inside of the water channel conversion component 3 along the water holes of the backwash skeleton 2 to achieve a flushing effect. At the same time, a backwash filter net for filtering impurities is also provided on the outside of the backwash skeleton 2.

[0062] In order to achieve the effect of automatic switching, a backwash spring 14 is arranged inside the piston 18. In the backwash state, the backwash spring 14 is in a compressed state. At this time, the backwash spring 14 can provide the piston 18 with an elastic force to move in a direction away from the drain ball valve 20; when the drain ball valve 20 is closed, the water pressure acting on the force surface 1801 on the piston 18 disappears, and the piston 18 moves upward under the action of the backwash spring 14, and drives the plug 10 and the water channel conversion component 3 threadedly connected thereto to move upward together. The water channel conversion component 3 blocks the water through hole of the backwash skeleton 2, thereby converting the clean water backwash state into the filtration state through the water channel conversion component 3.

[0063] The pre-filter is also provided with a water divider 4 connected to the inner frame 5, and a plurality of inclined guide surfaces 403 are evenly distributed on the water divider 4, and the water flow will rotate clockwise after passing through the water divider 4. The rotation of the water flow will generate centrifugal force, so that impurities will not be adsorbed on the bottle body 7, the outer frame 6 and the filter net.

[0064] In order to facilitate the assembly of the water divider 4 with the bottle body 7 and the inner frame 5, the outer wall of the water divider 4 is evenly distributed with four limiting ribs 401, and the four limiting ribs 401 are installed one by one with the four limiting grooves 701 on the bottle body 7; at the same time, the inner wall of the water divider 4 is also provided with a plurality of slots 402, and the slots 402 correspond to the convex ribs 502 on the inner frame 5. It should be noted that when the water flow hits the inclined guide surface 403 on the water divider 4, the water divider 4 will not be rotated together with the water flow. Of course, this article does not specifically limit the number of limiting ribs 401 and slots 402 on the water divider 4.

[0065] The following specifically introduces the normal filtration principle and the switching process between filtration and backwashing:

[0066] 1. Normal filtering status

[0067] Water flow diagram Fig.21 During normal filtration, the drain ball valve 20 is closed, and the water pressure in various places inside the bottle body 7 is basically the same. At this time, the elastic force of the backwash spring 14 acts on the plane of the piston 18, thereby holding the piston 18. Since the piston 18 and the plug 10 are connected by a connecting rod 15, the internal thread 1001 on the plug 10 is screwed with the external thread 301 on the water channel conversion part 3. In other words, the elastic force of the stainless steel spring indirectly acts on the water channel conversion part 3, so that the water flow in the valve head 1 cannot enter the interior of the water channel conversion part 3 through the water hole of the backwash skeleton 2, so that a filtering state can be formed.

[0068] Specifically, the source water enters the water inlet end of the valve head 1, passes through the water divider 4, and is filtered by the filter screen, and finally enters the interior of the water path conversion component 3. It should be noted that after passing through the water divider 4, the water flow will rotate clockwise to generate a water vortex, and the rotation of the water flow will generate centrifugal force, so that impurities will not be adsorbed on the bottle body 7, the outer frame 6 and the filter screen.

[0069] 2. Clean water backwash status

[0070] Water flow diagram Fig. 22As described. The drain ball valve 20 is rotated counterclockwise to open the drain ball valve 20. At this time, due to the negative pressure, the water pressure of the water flow inside the bottle body 7 acts on the protruding plane on the piston 18, and the piston 18 moves downward under the water pressure. Since the piston 18 is connected to the plug 10 by the connecting rod 15, the internal thread 1001 of the plug 10 is screwed with the external thread 301 on the water channel conversion part 3. Therefore, when the piston 18 moves downward under the action of water pressure, it will drive the water channel conversion part 3 to move downward together. The downward movement of the water channel conversion part 3 will change the direction of the water flow and convert the filtering state into a clean water backwashing state (during backwashing, a backwashing filter is also installed on the outside of the backwashing frame 2. During backwashing, water enters the inside of the water channel conversion part 3 from the backwashing filter, and then flows from the inside to the outside, achieving a clean water backwashing effect).

[0071] During backwashing with clean water, water flows out from the inner side of the water channel conversion component 3 to the outer side of the filter screen. When passing through the booster component 8, the booster component 8 will rotate 360° to discharge water outward and increase the flushing pressure of the water flow, making the flushing cleaner. When passing through the sewage outlet component 12, the water will be guided by the guide channel 1202 on the sewage outlet component 12 and then discharged from the water outlet 1201. The water flowing out of the water outlet 1201 will flow out clockwise due to the diversion inertia of the guide channel 1202. The water hits the blades 1701 on the impeller 17, driving the impeller 17 to rotate. When the impeller 17 rotates, it will drive the exoskeleton 6 to rotate, and the scraper 603 installed on the exoskeleton 6 will scrape the impurities on the inner wall of the bottle body 7 and the filter screen.

[0072] The water flowing out of the water outlet hole 1201 on the sewage outlet 12 flows out through the water outlet hole 1201 on the sealing plate 13. Since there is a horizontal distance between the two water outlet holes 1201 on the sewage outlet 12, the water flowing out of the water outlet holes 1201 will hit the blades 1701 of the impeller 17, ensuring the rotation speed of the impeller 17, that is, ensuring the rotation speed of the scraper 603 on the outer frame 6 to scrape and wash the filter screen. Of course, the diameters of the water outlets of the sewage outlet 12 and the sealing plate 13 are set relatively small, which will have a siphon effect when discharging sewage and facilitate the discharge of large particles of impurities.

[0073] 3. Restore filtering status

[0074] After the backwashing is completed, the ball valve is turned clockwise to close, and the backwashing spring 14 rebounds. The elastic force acts on the lower end surface 1802 of the piston 18, driving the piston 18 to move upward. When the piston 18 moves upward, it will drive the water channel conversion component 3 to move upward together. The upward movement of the water channel conversion component 3 will change the direction of the water flow, and the clean water backwashing state will be converted into a filtering state.

[0075] It can be seen that by using the above-mentioned pre-filter, a water vortex can be generated in the water separator 4 during filtering, generating centrifugal force, so that impurities will not be adsorbed on the bottle body 7, the exoskeleton 6 and the filter screen; during flushing, the water pressure is increased by the booster 8, so that a 360° rotation is achieved to flush the filter screen from the inside out; on this basis, through the rotation of the exoskeleton 6, the scraper 603 on the exoskeleton 6 continuously scrapes the outer surface of the filter screen and the inner wall of the bottle body 7 to achieve a scraping operation; at the same time, the pre-filter also has a siphon effect through the setting of the sewage outlet 12 and the sealing plate 13, which facilitates the discharge of large particles of impurities.

[0076] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0077] The above is a detailed introduction to the pre-filter provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the scheme and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pre-filter, characterized in that: The invention comprises an outer frame (6), a bottle body (7) and a filter screen arranged on the inner side of the outer frame (6), wherein the outer frame (6) is provided with a plurality of scraping strips (603) for scraping off impurities on the inner wall of the bottle body (7) and the filter screen, and further comprises a rotation drive component connected to the outer frame (6), wherein the outer frame (6) is driven to rotate by the rotation drive component so that the scraping strips (603) scrape off impurities on the inner wall of the bottle body (7) and the filter screen; The rotary drive assembly comprises an impeller (17) and a plurality of blades (1701) distributed along the circumference of the impeller (17); the impeller (17) is connected to the outer frame (6) via a rotating shaft (16); the impeller (17) drives the rotating shaft (16) and the outer frame (6) to rotate by the impeller (17) when water strikes the blades (1701); A sewage discharge and water outlet component (12) and a sealing plate (13) for supporting the rotating shaft (16) are provided below the outer frame (6), and the impeller (17) and all the blades (1701) are arranged inside the sewage discharge and water outlet component (12); The sewage discharge and water outlet member (12) is provided with a water outlet hole (1201) and a diversion channel (1202) for guiding water flow, two of each of the water outlet hole (1201) and the diversion channel (1202) are provided, and the diversion channel (1202) is provided with a diversion slope whose height decreases in a clockwise direction. Under the guidance of the diversion slope, the water flow is guided along the water outlet hole (1201) due to inertia, and after flowing out of the water outlet hole (1201), the water can also rotate clockwise to hit the blade (1701) in a directional manner; There is a horizontal distance between the two water outlet holes (1201) on the sewage outlet member (12), so that the water flowing out of the water outlet holes (1201) will hit the blades (1701), thereby ensuring the rotation speed of the scraper (603) on the outer frame (6) to scrape the filter screen; By reducing the diameter of the water outlet hole (1201) of the sewage discharge member (12) and the sealing plate (13), a siphon effect is generated during sewage discharge to discharge large particles of impurities.

2. The pre-filter according to claim 1, characterized in that: The rotating shaft (16) is provided with an extension portion extending radially outwardly for carrying the impeller (17), and the sealing plate (13) is provided with an annular support portion for contacting and abutting against the bottom surface of the extension portion.

3. The pre-filter according to claim 1, characterized in that: It also comprises a fixing frame (21) threadedly connected to the sewage discharge water outlet (12); the fixing frame (21) and the sewage discharge water outlet (12) are screwed together via threads to fix the sealing plate (13) located between the sewage discharge water outlet (12) and the fixing frame (21).

4. The pre-filter according to any one of claims 1 to 3, characterized in that: An inner frame (5) for mounting the filter screen is provided on the inner side of the outer frame (6), a booster (8) is provided on the inner side of the inner frame (5), and the booster (8) is provided with a plurality of booster holes (801) for adjusting the outlet water pressure to enhance the flushing effect.

5. The pre-filter according to claim 4, characterized in that: All of the pressurizing holes (801) are oblique water outlet holes. When water is discharged, the water flow impacts the inner wall of the oblique water outlet hole to drive the pressurizing component (8) to rotate.

6. The pre-filter according to claim 4, characterized in that: The number of the scraping bars (603) is two, and the outer frame (6) is provided with two scraping bar grooves (602) for installing the two scraping bars (603) respectively, and two scraping bar covers (604) for preventing the two scraping bars (603) from falling out when scraping the filter screen.

7. The pre-filter according to claim 6, characterized in that: The scraper bar (603) is an integrally formed silicone scraper bar or an integrally formed brush.

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