Split flow assembly for pre-filter and pre-filter

Abstract

The utility model relates to water purification equipment technical field discloses a shunt subassembly of prefilter and prefilter, the shunt subassembly of prefilter includes shunt casing and shunt ware, and shunt ware is arranged in shunt casing and can be axially moved between filter position and blowdown position relative to shunt casing, when shunt ware is located filter position, the inner chamber of shunt casing opens, and the inner chamber of shunt ware closes, and water flow passes through the inner chamber of shunt casing, when shunt ware is located blowdown position, the inner chamber of shunt casing closes, and the inner chamber of shunt ware opens, and water flow passes through the inner chamber of shunt ware. The shunt subassembly of prefilter provided by the utility model can conveniently realize the switching of filter waterway and blowdown waterway, and can automatically scrape and wash through the rotation of scraping and washing assembly driven by water flow during blowdown, so the operation is convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, specifically to a pre-filter diversion component and a pre-filter. Background Technology

[0002] A pre-filter is the first coarse filtration device for household water supply. It is usually installed after the water meter and can filter out large particulate impurities such as mud, algae, and colloids in tap water. This prevents the large amount of sediment and impurities generated in urban and residential water supply networks from causing harm to the human body, and also provides pre-protection for downstream equipment such as underfloor heating pipes, household faucets, and electrical appliances.

[0003] After prolonged use, dirt accumulates on the surface of the filter cartridge, making it difficult to rinse clean. This accumulated impurities gradually clog the filter cartridge, reducing the water flow rate, causing a pressure drop, and affecting the lifespan of the pre-filter. Traditional cleaning methods typically require disconnecting the pipeline, manually disassembling the pre-filter, and brushing the filter cartridge. This is inefficient, time-consuming, labor-intensive, and provides a poor user experience. Furthermore, the disassembly and reassembly process can easily damage various components.

[0004] Therefore, there is an urgent need to provide a pre-filter diversion component and a pre-filter to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a diversion component and a pre-filter for a pre-filter, which can facilitate the switching between the filtered water path and the sewage discharge path. Furthermore, during sewage discharge, the scraping component can be driven to rotate by the water flow for automatic scraping, making the operation convenient and quick, and greatly reducing the difficulty of cleaning the filter cartridge.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The pre-filter diversion assembly includes a diversion housing and a diverter, wherein the diverter is disposed within the diversion housing and is axially movable relative to the diversion housing between a filtration position and a sewage discharge position.

[0008] When the diverter is in the filtration position, the inner cavity of the diverter housing is open, the inner cavity of the diverter is closed, and the water flows through the inner cavity of the diverter housing.

[0009] When the diverter is located at the sewage discharge position, the inner cavity of the diverter housing is closed, and the inner cavity of the diverter is open, allowing water to flow through the inner cavity of the diverter.

[0010] As an alternative, when the diverter is located at the sewage discharge position, the water flow forms a vortex after passing through the inner cavity of the diverter, which can drive the scraping assembly located on the lower side of the diverter to rotate.

[0011] As an alternative, the top of the diverter is provided with multiple evenly distributed guide vanes, which can form the vortex after the water flows through the guide vanes.

[0012] As an optional solution, the bottom of the diverter housing is provided with a flow hole communicating with the inner cavity of the diverter housing, and the periphery of the diverter is provided with a sealing flange;

[0013] When the diverter is located at the sewage discharge position, the sealing flange blocks the flow hole, and the top opening of the diverter is open;

[0014] When the distributor is in the filtering position, the top opening of the distributor is blocked and the flow hole is opened.

[0015] As an optional solution, a limiting ring is provided on the inner side of the diverter housing, and the diverter passes through the inner hole of the limiting ring and is circumferentially limited and matched with the limiting ring.

[0016] As an alternative, the inner hole of the limiting ring is a non-circular hole, and the circumferential profile of the distributor is adapted to the shape of the inner hole of the limiting ring.

[0017] As an alternative, one of the inner wall of the limiting ring and the outer peripheral wall of the distributor is provided with a rib, and the other is provided with a groove, with the rib and the groove providing a limiting fit.

[0018] As an alternative, the outer periphery of the diversion housing has an upper shoulder and a lower shoulder spaced apart vertically. The lower shoulder is configured to abut against a filter cartridge located on the lower side of the diversion housing, and the upper shoulder is configured to abut against a valve head sleeved on the outside of the diversion housing.

[0019] As an optional solution, a first sealing ring is provided between the upper shoulder and the valve head, and a second sealing ring is provided between the lower shoulder and the filter cartridge.

[0020] A pre-filter includes a valve head, a bottle body connected to the lower port of the valve head, a filter cartridge disposed in the bottle body, a scraping assembly rotatably disposed in the filter cartridge, and a diversion assembly of the pre-filter, wherein the diversion housing is disposed between the top of the filter cartridge and the valve head.

[0021] When the distributor is in the filtration position, the water flows through the inner cavity of the distributor housing and into the inner cavity of the filter cartridge for filtration.

[0022] When the diverter is located at the sewage discharge position, water flows through the inner cavity of the diverter and drives the scraping assembly to rotate.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model provides a pre-filter diversion component and a pre-filter. In the filtration state, the diverter moves upward to the filtration position. At this time, the inner cavity of the diverter is not filled with water, but the inner cavity of the diverter housing is filled with water. The water flows through the inner cavity of the diverter housing and enters the filter cartridge for filtration. In the sewage discharge state, the diverter descends to the sewage discharge position. At this time, the inner cavity of the diverter housing is not filled with water, but the inner cavity of the diverter is filled with water. The water flows through the inner cavity of the diverter, and the resulting vortex impacts the scraping component, thereby driving the scraping component to rotate and scrape off the impurities attached to the inner wall of the filter cartridge, causing the accumulated impurities to fall off the inner wall of the filter cartridge. Therefore, by setting up the aforementioned diversion components, the working mode of the pre-filter can be switched, thereby further realizing the automatic switching between the filtered water path and the sewage discharge path. This allows the pre-filter to switch between filtration and sewage discharge states. In the sewage discharge state, the kinetic energy of the water flow directly drives the scraping component to rotate, thereby achieving automatic cleaning of the filter cartridge. This ensures that the filtration effect of the filter cartridge can continue to function. The entire cleaning process only requires manual opening of the sewage discharge port, making the operation convenient and quick, and significantly reducing the difficulty of cleaning the filter cartridge. Attached Figure Description

[0025] To more clearly and understandably illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the shunt component provided in an embodiment of the present utility model;

[0027] Figure 2 This is a cross-sectional view of the pre-filter provided in the embodiment of this utility model in the filtration state;

[0028] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 This is a cross-sectional view of the pre-filter provided in this embodiment of the present invention in the sewage discharge state;

[0030] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0031] Figure 6 This is a schematic diagram of the structure of the flow divider housing provided in an embodiment of the present invention;

[0032] Figure 7 This is an exploded view of the flow-diverting shell provided in an embodiment of this utility model;

[0033] Figure 8 This is an isometric sectional view of the bracket provided in this embodiment of the utility model;

[0034] Figure 9 This is a schematic diagram of the scraping assembly provided in an embodiment of the present invention;

[0035] Figure 10 yes Figure 2 A magnified view of a section at point C;

[0036] Figure 11 yes Figure 4 A magnified view of a section at point D;

[0037] Figure 12 This is a cross-sectional view of the support frame provided in an embodiment of the present utility model;

[0038] Figure 13 This is a schematic diagram of the support frame provided in an embodiment of the present utility model.

[0039] In the picture:

[0040] 10. Filter bottle; 11. Valve head; 111. Inlet channel; 112. Outlet channel; 113. First partition; 114. Second partition; 12. Bottle body; 121. Raw water chamber; 122. Clean water chamber; 123. Positioning groove; 124. Drain outlet; 125. Pressure chamber;

[0041] 20. Filter cartridge; 21. Filter screen; 22. Support; 221. Outer ring frame; 2211. Positioning protrusion; 2212. Sealing protrusion; 222. Inner ring frame; 223. Drain hole;

[0042] 30. Scraping assembly; 31. Rotating shaft; 32. Brush holder; 33. Brush; 331. Upper brush; 332. Lower brush; 34. Rotating blade; 35. Reinforcing rib; 36. First steel ball; 37. Second steel ball; 38. First stainless steel shaft; 39. Second stainless steel shaft;

[0043] 40. Diverter assembly; 41. Diverter housing; 411. Upper housing; 4111. Upper shoulder; 4112. Hook; 41121. Horizontal part; 41122. Vertical part; 412. Lower housing; 4121. Lower shoulder; 4122. Snap-fit; 413. Limiting ring; 414. Flow hole; 42. Diverter; 421. Sealing flange; 422. Guide vane; 423. Central shaft; 4231. First rotating hole; 43. First sealing ring; 44. Second sealing ring; 45. Third sealing ring;

[0044] 50. Support frame; 51. Outer ring; 511. Second drain hole; 52. Inner ring; 521. Second rotating hole; 522. First drain hole; 523. Third drain hole; 53. Fourth sealing ring; 54. Fifth sealing ring; 55. Sixth sealing ring;

[0045] 60. Return spring; 70. Compression spring; 80. Sealing base; 90. Drain valve. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0047] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] This embodiment provides a pre-filter diversion component and a pre-filter, specifically, as follows: Figure 2As shown, the pre-filter includes a filter bottle 10 and the aforementioned pre-filter diversion assembly. The filter bottle 10 includes a separate valve head 11 and a bottle body 12. The valve head 11 is typically made of copper, and the bottle body 12 is typically made of plastic, such as PPR, PC, or PPA. The bottle body 12 can be transparent or opaque. The valve head 11 is a T-shaped tee, including a left-side inlet channel 111, a right-side outlet channel 112, and a lower port with internal threads. The left and right ends of the valve head 11 are used to fix an inlet pipe for water entering the filter bottle 10 and a drain pipe for water exiting. The upper end of the bottle body 12 is threaded into the lower port of the valve head 11. The bottle body 12 has a filter chamber inside, and a drain port 124 is located at the bottom of the bottle body 12. The drain port 124 can be selectively opened or closed.

[0051] Furthermore, such as Figure 1 and Figure 2 As shown, the pre-filter also includes a filter cartridge 20 and a scraping assembly 30. The filter cartridge 20 is disposed within the filter chamber and divides the filter chamber into a raw water chamber 121 located inside the filter cartridge 20 and a clean water chamber 122 located outside the filter cartridge 20. The scraping assembly 30 is rotatably disposed within the filter cartridge 20. The diversion assembly 40 includes a diversion housing 41 and a diverter 42. The diversion housing 41 is disposed between the top of the filter cartridge 20 and the valve head 11. The diverter 42 is a hollow shell structure with both ends open. The diverter 42 passes through the diversion housing. The diverter 42 is axially movable relative to the diverter housing 41 between the filtration position and the drain position. The top end of the scraping assembly 30 passes through the inner cavity of the diverter 42. When the diverter 42 is in the filtration position, the inner cavity of the diverter housing 41 is open and the inner cavity of the diverter 42 is closed. Water flows through the inner cavity of the diverter housing 41 into the filter cylinder 20 for filtration. When the diverter 42 is in the drain position, water flows through the inner cavity of the diverter 42 and can drive the scraping assembly 30 located on the lower side of the diverter 42 to rotate, so as to scrape the inner wall of the filter cylinder 20.

[0052] In other words, such as Figure 2 and Figure 3 As shown, in the filtration state, the drain outlet 124 is closed, causing the distributor 42 to move upward to the filtration position. At this time, the inner cavity of the distributor 42 is not filled with water, while the inner cavity of the distributor housing 41 is filled with water. The inlet channel 111 is connected to the raw water chamber 121 through the inner cavity of the distributor housing 41. Raw water enters from the inlet channel 111, flows through the inner cavity of the distributor housing 41, and then enters the raw water chamber 121 inside the filter cartridge 20. After being filtered by the filter cartridge 20, it enters the clean water chamber 122 and finally flows out from the outlet channel 112. Figure 4 and Figure 5As shown, in the sewage discharge state, the sewage outlet 124 is opened, causing the diverter 42 to descend to the sewage discharge position. At this time, the inner cavity of the diverter housing 41 is not filled with water, while the inner cavity of the diverter 42 is filled with water. The water inlet channel 111 is connected to the original water cavity 121 through the inner cavity of the diverter 42. After the water flows in from the water inlet channel 111, it flows through the inner cavity of the diverter 42, and the resulting vortex impacts the scraping assembly 30, thereby driving the scraping assembly 30 to rotate and scrape off the impurities attached to the inner wall of the filter cylinder 20, causing the accumulated impurities to fall off the inner wall of the filter cylinder 20 and be discharged from the sewage outlet 124 with the water flow.

[0053] Therefore, by setting the aforementioned diversion component 40, the working mode of the pre-filter can be switched. That is, by closing or opening the drain port 124, the position of the diverter 42 can be switched, thereby further realizing the automatic switching between the filtered water path and the drain sewage path. This allows the pre-filter to switch between the filtering state and the sewage discharge state. In the sewage discharge state, the kinetic energy generated by the water flow through the diverter 42 directly drives the scraping component 30 to rotate, thereby realizing the automatic cleaning of the filter cartridge 20. This ensures that the filtering effect of the filter cartridge 20 can continue to play its role. The entire cleaning process only requires manual opening of the drain port 124, which is convenient and quick to operate, greatly reducing the difficulty of cleaning the filter cartridge 20.

[0054] Specifically, such as Figure 1 As shown, the bottom of the diverter housing 41 is provided with a flow hole 414 that communicates with the inner cavity of the diverter housing 41, and the periphery of the diverter 42 is provided with a sealing flange 421. When the diverter 42 is in the sewage discharge position, the sealing flange 421 blocks the flow hole 414, and the top opening of the diverter 42 is open. When the diverter 42 is in the filter position, the top opening of the diverter 42 abuts against the top inner wall of the valve head 11 and is blocked, and the flow hole 414 is open.

[0055] like Figure 3 As shown, in the filtration state, the diverter 42 moves upward to the filtration position, and the top of the diverter 42 abuts against the inner wall of the top of the valve head 11, thereby sealing the top opening of the diverter 42. Therefore, the inner cavity of the diverter 42 is not flowing with water at this time. At this time, the sealing flange 421 moves upward to open the flow hole 414, so the inner cavity of the diverter housing 41 is flowing with water, and the water inlet channel 111 is connected to the original water cavity 121 through the inner cavity of the diverter housing 41. Figure 5As shown, in the sewage discharge state, the diverter 42 moves downward to the sewage discharge position. At this time, the sealing flange 421 moves down to block the flow hole 414. Therefore, the inner cavity of the diverter housing 41 is not filled with water. Meanwhile, the top of the diverter 42 disengages from the inner wall of the valve head 11, thereby opening the top opening of the diverter 42. Thus, the inner cavity of the diverter 42 is filled with water, and the inlet channel 111 connects with the original water chamber 121 through the inner cavity of the diverter 42. Therefore, through the above arrangement, the switching between the filtered water path and the sewage discharge path can be cleverly achieved.

[0056] In an optional embodiment, such as Figure 1 and Figure 6 As shown, the inner side of the diversion housing 41 is connected to two vertically arranged limiting rings 413. The limiting rings 413 are spaced apart from the inner wall of the diversion housing 41. The inner sides of the two limiting rings 413 are used to install the diverter 42. The openings formed between the outer sides of the two limiting rings 413 and the inner wall of the diversion housing 41 are the inlet and outlet of the water flow, respectively. The cavity between the inner wall of the diversion housing 41 and the outer wall of the diverter 42 is the cavity through which water flows in the filtration state. The aforementioned flow hole 414 is formed by the outer wall of the lower limiting ring 413 and the inner wall of the diversion housing 41. The diverter 42 passes through the inner hole of the limiting ring 413 and is circumferentially limited by the limiting ring 413, thereby preventing the diverter 42 from rotating under the impact of water flow. Specifically, in order to limit the rotation of the diverter 42, in an optional embodiment, such as Figure 6 As shown, the inner hole of the limiting ring 413 can be a non-circular hole, such as a regular square or regular pentagon, as long as the circumferential contour of the diverter 42 is adapted to the inner hole of the limiting ring 413. In another optional embodiment, a rib can be provided on one of the inner wall of the limiting ring 413 and the outer peripheral wall of the diverter 42, and a groove can be provided on the other. The rib and the groove are matched for limiting, that is, the limiting ring 413 and the diverter 42 can use the cooperation of the rib and the groove to prevent rotation.

[0057] In an optional embodiment, such as Figure 1 As shown, multiple guide vanes 422 are evenly distributed inside the top of the diverter 42. After the water flows through the guide vanes 422, it will form a vortex with rotational impact force. After impacting the scraping assembly 30, it will drive the entire scraping assembly 30 to rotate, thereby scraping the impurities on the inner surface of the filter cylinder 20.

[0058] In existing pre-filters, water first flows from the inlet channel 111 to the outside of the filter cartridge 20, then flows from the outside of the filter cartridge 20 to the inside for filtration, and finally flows from the inside of the filter cartridge 20 to the outlet channel 112. Therefore, the direction of water flow is from the outside of the filter cartridge 20 to the inside of the filter cartridge 20. Large particles of impurities are dispersed and remain on the outside of the filter cartridge 20, which are not easy to collect and are not easy to rinse clean, thus increasing the difficulty of removing impurities.

[0059] In this embodiment, such as Figure 2 and Figure 3 As shown, the diversion shell 41 is a hollow shell structure with both ends open. In the filtration state, the inlet water channel 111 is connected to the raw water chamber 121 through the inner cavity of the diversion shell 41, and the purified water chamber 122 is connected to the outlet water channel 112 through the outer space of the diversion shell 41.

[0060] In the filtration state, the water flow direction in the pre-filter is as follows: raw water first enters from the inlet channel 111, flows through the inner cavity of the diversion housing 41 into the raw water chamber 121 inside the filter cartridge 20, enters the clean water chamber 122 after being filtered by the filter cartridge 20, and then flows along the inner wall of the bottle 12 to the outer space of the diversion housing 41, and finally flows out from the outlet channel 112. Therefore, the inner cavity of the diversion shell 41 is the path through which raw water flows from the inlet channel 111 to the raw water chamber 121 during filtration, while the outer space of the diversion shell 41 is the path through which filtered purified water flows out of the purified water chamber 122 of the pre-filter. The diversion shell 41 isolates unfiltered water from filtered water, i.e., raw water and purified water. The inner side of the diversion shell 41 contains unfiltered water, and the outer side contains filtered water. The diversion shell 41 determines the direction of water flow from the inside of the filter cylinder 20 to the outside of the filter cylinder 20, which is conducive to collecting the filtered impurities inside the filter cylinder 20. When it is time to discharge sewage, the impurities can be quickly discharged from the bottom of the filter cylinder 20, making sewage discharge more convenient.

[0061] Specifically, such as Figure 2 As shown, the valve head 11 has a baffle plate inside. Specifically, the baffle plate is divided into a first baffle plate 113 and a second baffle plate 114. The first baffle plate 113 is horizontally arranged and located at the outlet of the inlet channel 111, and the second baffle plate 114 is vertically arranged and located at the inlet of the outlet channel 112. Combined with... Figure 2 and Figure 5 The outer periphery of the diversion housing 41 has an upper shoulder 4111 and a lower shoulder 4121. The lower shoulder 4121 abuts against the upper end face of the filter cartridge 20, and the upper shoulder 4111 abuts against the lower end faces of the first partition 113 and the second partition 114. The first partition 113 is used to isolate the outer space of the diversion housing 41 from the water inlet channel 111, and the second partition 114 is used to isolate the water inlet channel 111 from the water outlet channel 112. By adopting the above configuration, the diversion housing 41 can be installed in a limited position, providing a flow channel for water.

[0062] In an optional embodiment, such as Figure 3As shown, a first sealing ring 43 is provided between the upper shoulder 4111 and the first partition 113 and the second partition 114 to achieve a sealing performance at the abutment position of the upper shoulder 4111 and the first partition 113 and the second partition 114. A second sealing ring 44 is provided between the lower shoulder 4121 and the filter cylinder 20 to achieve a sealing performance at the abutment position of the lower shoulder 4121 and the filter cylinder 20, thereby providing a sealed flow channel for water flow. The first sealing ring 43 and the second sealing ring 44 can be selected as O-rings.

[0063] Optionally, such as Figure 3 As shown, the diversion housing 41 includes a separate upper housing 411 and a lower housing 412 with identical structures. The upper housing 411 and the lower housing 412 are interlocked and detachably connected. The outer periphery of the upper housing 411 is provided with an upper shoulder 4111, and the outer periphery of the lower housing 412 is provided with a lower shoulder 4121. The inner sides of the upper housing 411 and the lower housing 412 are respectively provided with the aforementioned limiting rings 413. The diversion housing 41 is formed by the interlocking of the structurally identical upper housing 411 and lower housing 412, decomposing the complex diversion housing 41 into the structurally simple upper housing 411 and lower housing 412. Furthermore, the upper housing 411 and the lower housing 412 can be manufactured using the same mold, greatly reducing the manufacturing difficulty and processing cost of each individual part, increasing flexibility. Moreover, if a part in the upper housing 411 or the lower housing 412 is damaged, the separate design allows only the damaged part to be replaced, rather than scrapping the entire diversion housing 41, which greatly reduces maintenance costs.

[0064] In an optional embodiment, such as Figure 3 As shown, a third sealing ring 45 is provided between the mating surfaces of the upper housing 411 and the lower housing 412. The third sealing ring 45 enables a sealing performance between the upper housing 411 and the lower housing 412, thereby providing a sealed flow channel for water. The third sealing ring 45 can be an O-ring.

[0065] In an optional embodiment, the upper housing 411 and the lower housing 412 are screwed together via a snap-fit ​​structure. Specifically, as shown... Figure 7As shown, the snap-fit ​​structure includes a matching buckle 4122 and a hook 4112. A U-shaped buckle 4122 is provided on the outer periphery of the lower housing 412, with its opening facing the axis of the lower housing 412. A hook 4112 is provided on the outer periphery of the upper housing 411. The hook 4112 is L-shaped and includes a horizontal portion 41121 and a vertical portion 41122 connected vertically. The horizontal portion 41121 engages with the opening of the buckle 4122. After the upper housing 411 and lower housing 412 are snapped together, rotating the upper housing 411 causes the horizontal portion 41121 to insert circumferentially into the opening of the buckle 4122, while the vertical portion 41122 abuts against the side of the hook 4112, forming a limiting position. Through the engagement of the buckle 4122 and the hook 4112, a circumferential and axial limiting connection between the upper housing 411 and lower housing 412 is achieved, and the connection is quick and convenient.

[0066] In another optional embodiment, a hook 4112 can be provided on the outer periphery of the lower housing 412, and a buckle 4122 can be provided on the outer periphery of the upper housing 411, achieving the same effect. In another optional embodiment, both a hook 4112 and a buckle 4122 can be provided on the outer periphery of the lower housing 412, and both a buckle 4122 and a hook 4112 corresponding to and cooperating with the lower housing 412 can be provided on the outer periphery of the upper housing 411.

[0067] Optionally, the number of the aforementioned buckles 4122 and hooks 4112 can be set to two, three or more evenly spaced along the circumference, which can be flexibly set according to actual needs, and no specific limitation is made here.

[0068] In another alternative embodiment, the upper housing 411 and the lower housing 412 may also be connected by other forms of snap-fit ​​structures, which are not specifically limited here.

[0069] Optionally, such as Figure 8 As shown, the filter cylinder 20 includes a filter screen 21 and a support 22. The filter screen 21 is a cylindrical structure with openings at both ends. By setting the cylindrical filter screen 21, the effective filtration area can be increased, the filtration effect on the water flow can be improved, and the flow rate of water through the filter screen 21 can be guaranteed. The support 22 is fitted and sleeved on the outside of the filter screen 21 to support the filter screen 21 and prevent the filter screen 21 from deforming under water pressure and losing its filtration effect. The lower shoulder 4121 of the diverter housing 41 abuts against the top of the support 22.

[0070] Optionally, combined Figure 2 and Figure 8 At least two positioning protrusions 2211 are provided on the upper periphery of the bracket 22. The positioning protrusions 2211 are engaged with the positioning grooves 123 on the inner side of the top of the bottle body 12, so that the filter cartridge 20 can be positioned inside the bottle body 12 to prevent the filter cartridge 20 from deflecting.

[0071] In an optional embodiment, such as Figure 9 As shown, the scraping assembly 30 includes a rotating shaft 31, a brush holder 32, a brush 33, and rotating blades 34. The top periphery of the rotating shaft 31 is provided with a plurality of rotating blades 34 evenly spaced along its circumference. The rotating blades 34 pass through the diverter 42 and are located below the guide vane 422. Below the rotating blades 34, the periphery of the rotating shaft 31 is provided with a plurality of brush holders 32 evenly spaced along its circumference. The brush holder 32 is composed of a plurality of rods connected together, and each brush holder 32 is provided with a brush 33 on its outer periphery. In the sewage discharge state, the water flows from the upper end of the diverter 42 and forms a vortex with rotational impact after passing through the guide plate 422. The vortex impacts the rotating blade 34, causing the rotating blade 34 to drive the rotating shaft 31 to rotate. The rotating shaft 31 drives the brush holder 32 and the brush 33 to make a circular motion. The brush 33 can not only wash away the impurities attached to the inner wall of the filter screen 21, but also the bristles of the brush 33 can extend into the filter hole of the filter cylinder 20 to remove the impurities stuck in the filter hole, thus improving the washing effect.

[0072] In this embodiment, the number of rotating blades 34 can be set to six, and the number of brush holders 32 can be set to four. In other optional embodiments, the number of rotating blades 34 and brush holders 32 can also be set to other numbers, which can be adapted according to actual needs, and no specific limitation is made here.

[0073] In an optional embodiment, such as Figure 9 As shown, reinforcing ribs 35 connect the upper ends of each brush holder 32, and reinforcing ribs 35 also connect the lower ends of each brush holder 32. This arrangement allows the reinforcing ribs 35 to fix each brush holder 32 together as a whole, improving the structural strength of each brush holder 32 and making the entire scraping assembly 30 more robust and durable.

[0074] In an optional embodiment, such as Figure 9 As shown, the brush 33 is divided into an upper brush 331 and a lower brush 332. The upper brush 331 and the lower brush 332 are mounted on different brush holders 32. The upper brush 331 and the lower brush 332 are of equal length and are staggered. The upper brush 331 can brush the upper half of the filter screen 21, and the lower brush 332 can brush the lower half of the filter screen 21. This arrangement can reduce costs and ensure the rotational stability of the entire scraping assembly 30. Furthermore, the staggered installation of the upper brush 331 and the lower brush 332 allows impurities in the upper and lower parts of the filter screen 21 to be discharged intermittently, reducing the pressure of wastewater discharge.

[0075] Taking the four brush holders 32 in this embodiment as an example, in one optional embodiment, the upper brush 331 and the lower brush 332 can be respectively arranged on two adjacent brush holders 32. In another optional embodiment, the upper brush 331 and the lower brush 332 can also be respectively arranged on two opposite brush holders 32, without specific limitations.

[0076] In an optional embodiment, such as Figure 2 As shown, to open or close the drain port 124, the pre-filter also includes a sealing base 80 and a drain valve 90. The sealing base 80 is sealed within the drain port 124, and a drain channel communicating with the bottle body 12 is provided within the sealing base 80. The drain valve 90 is threadedly connected to the sealing base 80 and is used to open or close the drain channel, thereby opening or closing the drain port 124. The operation is convenient and quick. In this embodiment, the drain valve 90 can be a ball valve, the specific structure and working principle of which are existing technologies and will not be described in detail here. In one optional embodiment, the opening and closing of the drain valve 90 can be manually controlled by the operator, which is convenient and cost-effective. In another optional embodiment, the opening and closing of the drain valve 90 can also be controlled by a motor or an electromagnetic actuator. In another optional embodiment, to open or close the drain port 124, a plug can also be threadedly connected within the sealing base 80.

[0077] In an optional embodiment, such as Figure 2 As shown, the pre-filter also includes a support frame 50, which is sealed to the bottom of the filter cartridge 20. The top of the scraping assembly 30 abuts against the diverter 42, and the bottom of the scraping assembly 30 abuts against the support frame 50. The support frame 50 can move up and down with the diverter 42 to switch between the filtration position and the sewage discharge position. When the support frame 50 is in the sewage discharge position, the raw water chamber 121 can be connected to the sewage discharge port 124 through the support frame 50 for sewage discharge. First, the support frame 50 serves to support and limit the scraping assembly 30. The upper end of the rotating shaft 31 of the scraping assembly 30 is supported by the diverter 42, and the lower end of the rotating shaft 31 is supported by the support frame 50. The rotating shaft 31 can rotate relative to the diverter 42 and the support frame 50, but the diverter 42 and the support frame 50 themselves do not rotate. The diverter 42, the rotating shaft 31, and the support frame 50 move up and down synchronously. The second function of the support frame 50 is to separate the raw water chamber 121, the clean water chamber 122, and the drain outlet 124. When the support frame 50 descends to the drain position with the diverter 42, the raw water chamber 121 can be connected to the drain outlet 124 through the support frame 50 for draining.

[0078] In an optional embodiment, such as Figure 3 As shown, the top end of the rotating shaft 31 of the scraping assembly 30 abuts against the diverter 42 via the first steel ball 36, as... Figure 10As shown, the bottom end of the rotating shaft 31 of the scraping assembly 30 abuts against the support frame 50 via the second steel ball 37. Therefore, a point-to-surface contact is formed between the top end of the rotating shaft 31 and the first steel ball 36, and a point-to-surface contact is formed between the bottom end of the rotating shaft 31 and the second steel ball 37. The contact area is extremely small, mainly bearing local loads, thus reducing the friction force borne by the rotating shaft 31 during rotation, thereby making the rotation smoother and increasing the effective work done by the rotation.

[0079] In an optional embodiment, such as Figure 3 As shown, a first stainless steel shaft 38 is inserted through the top end of the rotating shaft 31, and the first stainless steel shaft 38 abuts against the first steel ball 36, as... Figure 10 As shown, a second stainless steel shaft 39 is inserted through the bottom end of the rotating shaft 31, and the second stainless steel shaft 39 contacts the second steel ball 37. Therefore, both ends of the rotating shaft 31 are in direct contact with the steel ball through the stainless steel shaft. The stainless steel shaft can withstand the local load in the spherical-plane contact connection. This design increases the service life of the rotating shaft 31 and reduces the cost of using stainless steel materials for the rotating shaft 31.

[0080] Specifically, such as Figure 1 As shown, a central shaft 423 is connected to the center of multiple guide vanes 422. A first rotating hole 4231 is opened in the central shaft 423. Part of the first steel ball 36 is housed in the first rotating hole 4231 for limiting installation, so as to prevent the first steel ball 36 from deviating during the rotation of the rotating shaft 31; similarly, as Figure 12 As shown, a second rotation hole 521 is provided at one end of the support base near the rotating shaft 31. Part of the second steel ball 37 is housed in the second rotation hole 521 for limiting installation, so as to prevent the second steel ball 37 from running off-center during the rotation of the rotating shaft 31.

[0081] Furthermore, such as Figure 2 As shown, the pre-filter also includes a reset spring 60 and a pressure spring 70. The reset spring 60 abuts between the diverter 42 and the diverter housing 41, specifically between the sealing flange 421 of the diverter 42 and the upper limiting ring 413 inside the diverter housing 41. The pressure spring 70 abuts between the bottom of the bottle body 12 and the support frame 50, specifically between the sealing base 80 and the support frame 50. The support frame 50 is sealed against the inner wall of the bottle body 12, and the bottom of the support frame 50 and the bottle body 12 form a pressure chamber 125, which is connected to the drain port 124. Figure 1 As shown, when the drain outlet 124 is closed, the pressure chamber 125 is under high pressure and supports the support frame 50 upwards. The scraping assembly 30, under the action of the pressure spring 70, moves upwards with the support frame 50 and pushes the diverter 42 upwards, causing the diverter 42 to move to the filtration position and compress the reset spring 60; Figure 4As shown, when the drain outlet 124 is opened, the pressure in the pressure chamber 125 decreases, the support frame 50 moves down and compresses the pressure spring 70. At this time, the original water chamber 121 is connected to the drain outlet 124 through the support frame 50. The scraping assembly 30 moves down with the support frame 50, and the diverter 42 moves down with the scraping assembly 30 under the action of the reset spring 60, so that the diverter 42 moves to the drain position.

[0082] Specifically, such as Figure 2 As shown, in the filtration state, the drain port 124 is closed and the pressure chamber 125 is sealed, so the pressure chamber 125 is under high pressure, which can support the support frame 50 upward. The pressure spring 70 is in the reset state and supports the support frame 50 at the same time. The scraping assembly 30 moves upward with the support frame 50 under the action of the pressure spring 70 and pushes the diverter 42 upward, so that the diverter 42 is stabilized in the filtration position and the reset spring 60 is compressed. That is, the diverter 42 abuts against the inner wall of the top of the valve head 11. The inner cavity of the diverter 42 is not filled with water. The water inlet channel 111 is connected to the raw water chamber 121 through the inner cavity of the diverter housing 41. The raw water enters from the water inlet channel 111, flows through the inner cavity of the diverter housing 41 and enters the raw water chamber 121 inside the filter screen 21. After being filtered by the filter screen 21, it enters the clean water chamber 122 and finally flows out from the water outlet channel 112.

[0083] like Figure 4 As shown, in the drain state, the drain port 124 is open, and the pressure in the pressure chamber 125 is released to atmospheric pressure. Therefore, the pressure in the pressure chamber 125 decreases, and the pressure below the support frame 50 drops instantaneously, thus creating a pressure difference between the upper and lower sides of the support frame 50 inside the bottle body 12. Under the action of the pressure difference, the support frame 50 moves downward, and the scraping assembly 30 moves downward with the support frame 50 under the force of attraction, compressing the pressure spring 70. At this time, the reset spring 60 resets, and the diverter 42 moves downward with the scraping assembly 30 under the action of the reset spring 60, causing the diverter 42 to move from the filtration position to the drain position. In the drain position, the sealing flange 421 of the diverter 42 and The diverter housing 41 fits snugly to block the flow hole 414, and the support frame 50 abuts against the sealing base 80. At this time, the inner cavity of the diverter housing 41 is not filled with water, and the inner cavity of the diverter housing 41 is filled with water and can press the diverter 42. The inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter 42. The original water chamber 121 is connected to the drain port 124 through the support frame 50. After the water flows in from the inlet channel 111, it flows through the inner cavity of the diverter 42. The resulting vortex impacts the rotating blades 34 of the scraping assembly 30, thereby driving the scraping assembly 30 to rotate and scrape off the impurities attached to the inner wall of the filter screen 21. The impurities are then discharged through the support frame 50 and the drain port 124 with the water flow.

[0084] After the sewage discharge is completed, when the sewage outlet 124 is closed again, the pressure in the pressure chamber 125 will gradually increase, driving the support frame 50 to gradually move upward. The pressure spring 70 will reset, and under the action of the pressure spring 70, the scraping assembly 30 and the diverter 42 will also move upward and switch back to the filtration position.

[0085] As can be seen from this, the pre-filter provided in this application switches the drain port 124 between closed and open states via the drain valve 90, thereby opening and closing the pressure chamber 125. The pressure change within the pressure chamber 125 causes changes in the states of the pressure spring 70 and the return spring 60, thus switching between the filtration and drain states. In other words, switching between the filtration and drain functions of the pre-filter only requires operating the drain valve 90 to switch the states of the drain port 124 and the pressure chamber 125 with a single button. The switching operation is simple, quick, time-saving, and labor-saving, improving the user experience.

[0086] In an optional embodiment, such as for wastewater discharge via support frame 50, Figure 10 As shown, the support frame 50 includes an outer ring portion 51 and an inner ring portion 52. The outer ring portion 51 is connected to the outer periphery of the inner ring portion 52 and is sealed against the inner wall of the bottle body 12. The inner ring portion 52 is sealed through the bottom of the support 22 of the filter cartridge 20 and cooperates with the bottom of the rotating shaft 31 of the scraping assembly 30. The inner ring portion 52 is hollow and its top end is closed, with the closed end contacting and cooperating with the second steel ball 37. The bottom end of the inner ring portion 52 is open and used for sewage discharge. One end of the pressure spring 70 extends into the cavity of the inner ring portion 52 and abuts against the bottom of the cavity. The inner ring portion 52 includes a first part that can be sealed through the bottom of the support 22 and a second part located outside the support 22. The outer ring portion 51 is the dividing line between the first part and the second part.

[0087] Specifically, in combination Figure 10 , Figure 12 and Figure 13 As shown, a first drain hole 522 is provided on the side wall of the first part of the inner ring 52. The first drain hole 522 is connected to the inner cavity of the inner ring 52. The bottom of the support 22 of the filter cylinder 20 is provided with a drain hole 223 that is connected to the raw water chamber 121. The drain hole 223 is gradually inclined downward from the outside to the inside along the radial direction of the filter cylinder 20. When the support frame 50 is in the filtration position, the first drain hole 522 and the drain hole 223 are offset and cut off. When the support frame 50 is in the drain position, the first drain hole 522 and the drain hole 223 coincide. The drain hole 223 is connected to the drain outlet 124 through the first drain hole 522 and the inner cavity of the inner ring 52.

[0088] like Figure 10As shown, in the filtration state, the support frame 50 moves upward relative to the bracket 22 to the filtration position. At this time, the first drain hole 522 and the drain hole 223 are staggered and closed, and the inner ring 52 is disengaged from the sealing base 80. In this state, only filtration is performed, and sewage discharge is not possible. Figure 11 As shown, in the sewage discharge state, the support frame 50 moves down to the sewage discharge position relative to the bracket 22. At this time, the first sewage discharge hole 522 and the sewage drain hole 223 completely overlap, and the inner ring part 52 abuts against the sealing base 80. At this time, the sewage drain hole 223 is connected to the sewage outlet 124 through the first sewage discharge hole 522 and the inner cavity of the inner ring part 52, thus forming a complete sewage discharge passage. The sewage and impurities in the original water chamber 121 flow through the sewage drain hole 223 and the first sewage discharge hole 522 to the inner cavity of the inner ring part 52, and then flow out from the sewage outlet 124. This is conducive to the sewage during the internal washing of the filter screen 21 being quickly discharged through this sewage discharge passage.

[0089] In this embodiment, six evenly arranged first drain holes 522 are provided on the periphery of the inner ring portion 52, which can effectively and quickly discharge the wastewater washed down from the inside of the filter screen 21. In other optional embodiments, the number of first drain holes 522 can also be set to any number from three to eight. The size of the first drain holes 522 can be adjusted adaptively according to the change in number, and no specific limitation is made here.

[0090] In an optional embodiment, the first drain hole 522 can be designed with a structure that is wider on the outside and narrower on the inside, that is, the end near the outer side of the inner ring 52 is wider and the end near the inner side of the inner ring 52 is narrower. By utilizing the Venturi effect, sewage can be discharged faster and is less likely to deposit in the first drain hole 522.

[0091] In the existing technology, when the pre-filters on the market are performing sewage discharge, the sewage flows out of the drain valve 90 through a single channel. After the sewage on one side of the filter screen 21 is discharged, the scale on the other side needs to pass through the filter screen 21 again before it can be discharged. At this time, the scale will accumulate on the other side of the filter screen 21, resulting in incomplete sewage discharge. The sewage discharge function contradicts the filtration function, and the sewage discharge speed is slow.

[0092] To solve the above problems, such as Figure 10 , Figure 12 and Figure 13As shown, in this embodiment, a second drain hole 511 is provided on the outer ring portion 51, a sealing protrusion ring 2212 is provided at the bottom of the support 22 of the filter cylinder 20, and a third drain hole 523 is provided on the side wall of the second part of the inner ring portion 52. The third drain hole 523 is opened at the open end of the inner ring portion 52 and is used to connect the second drain hole 511 and the inner cavity of the inner ring portion 52. When the support frame 50 is in the filtration position, the sealing protrusion ring 2212 blocks the second drain hole 511. When the support frame 50 is in the drain position, the second drain hole 511 is opened, and the clean water chamber 122 is connected to the drain outlet 124 through the second drain hole 511, the third drain hole 523 and the inner cavity of the inner ring portion 52.

[0093] When washing the inner surface of the filter screen 21, some wastewater will inevitably pass through the filter screen 21 and flow into the water purification chamber 122. The design of the second drain hole 511 and the third drain hole 523 is to discharge the wastewater and small particulate impurities in the water purification chamber 122, preventing wastewater and impurities from remaining. Specifically, as... Figure 10 As shown, in the filtration state, the support frame 50 moves upward relative to the bracket 22 to the filtration position. At this time, the sealing ring 2212 blocks the second drain hole 511. In this state, only filtration is performed, and draining is not possible. Figure 11 As shown, in the sewage discharge state, the support frame 50 moves down relative to the bracket 22 to the sewage discharge position, and the sealing convex ring 2212 opens the second sewage discharge hole 511. At this time, the clean water chamber 122 is connected to the sewage discharge port 124 through the second sewage discharge hole 511, the pressure chamber 125, the third sewage discharge hole 523, and the inner cavity of the inner ring part 52, thus forming a complete sewage discharge passage. The sewage and impurities in the clean water chamber 122 flow to the pressure chamber 125 through the second sewage discharge hole 511, and then flow into the inner cavity of the inner ring part 52 through the third sewage discharge hole 523, and finally discharge from the sewage discharge port 124. This is beneficial for the sewage outside the filter screen 21 to be quickly discharged through this sewage discharge passage.

[0094] Therefore, in this embodiment, by opening a first drain hole 522, a second drain hole 511, and a third drain hole 523 on the support frame 50, two sets of drain passages are formed. The first drain hole 522 can discharge the wastewater inside the filter screen 21 after brushing, while the second drain hole 511 and the third drain hole 523 can discharge the wastewater outside the filter screen 21. After the drain port 124 is opened, the two sets of drain passages discharge wastewater to both the inside and outside of the filter screen 21 at the same time, ensuring the rapid discharge of wastewater from both sides of the filter screen 21 during brushing.

[0095] In this embodiment, the outer ring portion 51 is bowl-shaped, and the second drain hole 511 is located at the bottom of the outer ring portion 51. When the outer ring portion 51 is filled with sewage, the pressure at the bottom of the bowl-shaped structure is increased by the upper part being wider and the lower part being narrower, which can accelerate the water discharge speed of the second drain hole 511, thus making it less prone to scale buildup.

[0096] In this embodiment, as Figure 13 As shown, two second drain holes 511 and two third drain holes 523 are symmetrically arranged to ensure that the sewage in the clean water chamber 122 can be discharged in a timely and rapid manner. In other optional embodiments, the number of second drain holes 511 and third drain holes 523 can be set according to actual needs, and no specific limitation is made here.

[0097] In an optional embodiment, such as Figure 12 As shown, the second drain hole 511 can be designed with a structure that is wider at the top and narrower at the bottom. By utilizing the Venturi effect, sewage can be discharged more quickly and is less likely to deposit in the second drain hole 511.

[0098] In an optional embodiment, such as Figure 8 and Figure 10 As shown, the bracket 22 includes an outer ring bracket 221 and an inner ring bracket 222. The outer ring bracket 221 is fitted and sleeved on the outside of the filter screen 21. The inner ring bracket 222 is connected to the bottom inner side of the outer ring bracket 221. The inner ring portion 52 is sealed and inserted into the inner ring bracket 222. The inner bottom surface of the outer ring bracket 221 is gradually inclined downward from the outside to the inside along its radial direction and together with the inner ring bracket 222 defines the aforementioned drain hole 223. A sealing protrusion ring 2212 is formed at the bottom of the outer ring bracket 221. Figure 2 As shown, in the filtration state, the support frame 50 moves upward relative to the filter cylinder 20 to the filtration position. At this time, the drain hole 223 is blocked by the inner ring part 52, and the first drain hole 522 is blocked by the inner ring frame 222. Therefore, the first drain hole 522 and the drain hole 223 are in a staggered and closed state.

[0099] Optionally, such as Figure 10 and Figure 12 As shown, the inner ring 52 and the bracket 22 are sealed by two fourth sealing rings 53. The two fourth sealing rings 53 are embedded in the sealing groove of the inner ring 52 and are located on the upper and lower sides of the first drain hole 522, respectively. Figure 10 As shown, when the support frame 50 is in the filtration position, the first drain hole 522 and the drain hole 223 are misaligned and blocked by the inner ring frame 222. The two fourth sealing rings 53 abut against the inner wall of the inner ring frame 222 to achieve a seal, preventing sewage leakage during filtration. Figure 11 As shown, when the support frame 50 is in the sewage discharge position, the first sewage discharge hole 522 coincides with the sewage discharge hole 223, one of the fourth sealing rings 53 abuts against the inner wall of the inner ring frame 222, and the other fourth sealing ring 53 abuts against the inner wall of the outer ring frame 221, thereby achieving a sealing setting in the sewage discharge state.

[0100] Optionally, such as Figure 10 and Figure 12As shown, a fifth sealing ring 54 is provided between the outer periphery of the outer ring portion 51 and the inner wall of the bottle body 12. The fifth sealing ring 54 is embedded in the sealing groove on the outer periphery of the outer ring portion 51, thereby achieving a seal between the outer ring portion 51 and the inner wall of the bottle body 12.

[0101] Optionally, such as Figure 10 and Figure 12 As shown, a sixth sealing ring 55 is embedded on the inner bottom side of the outer ring 51. When the support frame 50 is in the filter position, the sealing convex ring 2212 presses against the sixth sealing ring 55, thereby blocking the second drain hole 511. Optionally, the fourth sealing ring 53, the fifth sealing ring 54, and the sixth sealing ring 55 can all be O-rings.

[0102] The working principle of the pre-filter provided in this embodiment is as follows:

[0103] Combination Figure 2 , Figure 3 and Figure 10 In the filtration state, the drain port 124 is closed by the drain valve 90, and the pressure chamber 125 is sealed. Therefore, the pressure chamber 125 is under high pressure, which can support the support frame 50 upwards. The pressure spring 70 is in the reset state and simultaneously supports the support frame 50. Under the action of the pressure spring 70, the scraping assembly 30 moves upwards with the support frame 50 and pushes the diverter 42 upwards, so that the diverter 42 is stabilized in the filtration position and the reset spring 60 is compressed. At this time, the diverter 42 abuts against the inner wall of the top of the valve head 11, and the top opening of the diverter 42 is blocked. Therefore, the inner cavity of the diverter 42 is not flowing with water. At this time, the sealing flange 421 moves upwards and opens the flow hole 414. Therefore, the inner cavity of the diverter housing 41 is flowing with water, and the water inlet channel 1... 11. The water supply is connected to the raw water chamber 121 through the inner cavity of the diversion housing 41 and the flow hole 414. At the same time, the support frame 50 is also located in the filtration position. The inner ring 52 is disengaged from the sealing base 80. The first drain hole 522 and the drain hole 223 are staggered and closed. At the same time, the sealing convex ring 2212 blocks the second drain hole 511. All drain passages are closed. In this state, only filtration is performed and no draining is possible. Raw water enters from the inlet channel 111, flows through the inner cavity of the diversion housing 41 and enters the raw water chamber 121 inside the filter screen 21. After being filtered by the filter screen 21, it enters the clean water chamber 122, and then flows along the inner wall of the bottle 12 to the outer space of the diversion housing 41. Finally, it flows out from the outlet channel 112. Figure 2 The direction of the arrow in the diagram indicates the direction of water flow.

[0104] Combination Figure 4 , Figure 5 and Figure 11In the drain state, the drain port 124 is closed by the drain valve 90, and the pressure in the pressure chamber 125 is released to atmospheric pressure. Therefore, the pressure in the pressure chamber 125 decreases, and the pressure below the support frame 50 drops instantaneously, thus creating a pressure difference between the upper and lower sides of the support frame 50 inside the filter bottle 10. Under the action of the pressure difference, the support frame 50 moves downward, and the scraping assembly 30 moves downward with the support frame 50 under the force of attraction, compressing the pressure spring 70. At this time, the return spring 60 returns to its original position, and the diverter 42 is activated by the return spring 60. As the scraping assembly 30 moves downward, the diverter 42 moves from the filtration position to the drain position. In the drain position, the top of the diverter 42 disengages from the inner wall of the valve head 11, thereby opening the top opening of the diverter 42. At the same time, the sealing flange 421 of the diverter 42 fits against the diverter housing 41 to block the flow hole 414. At this time, the inner cavity of the diverter housing 41 is not filled with water, and the inner cavity of the diverter housing 41 is filled with water and can press the diverter 42 tightly. The water inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter 42. Meanwhile, the support frame 50 is also located at the sewage discharge position. At this time, the first sewage discharge hole 522 and the sewage drain hole 223 are completely overlapped, and the inner ring 52 abuts against the sealing base 80. The raw water chamber 121 is connected to the sewage outlet 124 through the sewage drain hole 223, the first sewage discharge hole 522, and the inner cavity of the inner ring 52. At the same time, the sealing convex ring 2212 opens the second sewage discharge hole 511, and the clean water chamber 122 is connected to the sewage outlet 124 through the second sewage discharge hole 511, the third sewage discharge hole 523, and the inner cavity of the inner ring 52. After the water flows in from the inlet channel 111, it flows through the inner cavity of the diverter 42. The resulting vortex impacts the rotating blades 34 of the scraping assembly 30, thereby driving the scraping assembly 30 to rotate and scrape off the impurities attached to the inner wall of the filter screen 21. The sewage and impurities in the raw water chamber 121 flow to the inner cavity of the inner ring 52 through the sewage drain hole 223 and the first sewage drain hole 522. Figure 4 In the direction of the dotted arrow, the sewage and impurities in the clean water chamber 122 flow through the second drain hole 511 to the pressure chamber 125, and then flow into the inner cavity of the inner ring 52 through the third drain hole 523. Finally, they are discharged through the drain port 124 and the drain valve 90.

[0105] After the sewage discharge is completed, the sewage outlet 124 is closed by the sewage discharge valve 90. The pressure in the pressure chamber 125 will gradually increase and drive the support frame 50 to move upward. The pressure spring 70 will reset. Under the action of the pressure spring 70, the scraping assembly 30 and the diverter 42 will also move upward and switch back to the filtration position.

[0106] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pre-filter diversion assembly, characterized in that, It includes a diversion housing (41) and a diverter (42), the diverter (42) being disposed inside the diversion housing (41) and being axially movable relative to the diversion housing (41) between a filtration position and a drain position; When the diverter (42) is in the filtering position, the inner cavity of the diverter housing (41) is open, the inner cavity of the diverter (42) is closed, and the water flows through the inner cavity of the diverter housing (41); When the diverter (42) is located at the sewage discharge position, the inner cavity of the diverter housing (41) is closed, the inner cavity of the diverter (42) is opened, and the water flows through the inner cavity of the diverter (42).

2. The pre-filter diversion assembly according to claim 1, characterized in that, When the diverter (42) is located at the sewage discharge position, the water flow forms a vortex after passing through the inner cavity of the diverter (42) and can drive the scraping assembly (30) located on the lower side of the diverter (42) to rotate.

3. The pre-filter diversion assembly according to claim 2, characterized in that, The top of the diverter (42) is provided with a plurality of evenly distributed guide vanes (422), and the water flow can form the vortex after passing through the guide vanes (422).

4. The pre-filter diversion assembly according to claim 1, characterized in that, The bottom of the diverter housing (41) is provided with a flow hole (414) that communicates with the inner cavity of the diverter housing (41), and the periphery of the diverter (42) is provided with a sealing flange (421). When the diverter (42) is located at the sewage discharge position, the sealing flange (421) blocks the flow hole (414), and the top opening of the diverter (42) is opened; When the diverter (42) is in the filtering position, the top opening of the diverter (42) is blocked and the flow hole (414) is opened.

5. The pre-filter diversion assembly according to claim 1, characterized in that, The inner side of the diverter housing (41) is provided with a limiting ring (413), and the diverter (42) passes through the inner hole of the limiting ring (413) and is circumferentially limited and matched with the limiting ring (413).

6. The pre-filter diversion assembly according to claim 5, characterized in that, The inner hole of the limiting ring (413) is a non-circular hole, and the circumferential profile of the diverter (42) is adapted to the shape of the inner hole of the limiting ring (413).

7. The pre-filter diversion assembly according to claim 5, characterized in that, One of the inner wall of the limiting ring (413) and the outer peripheral wall of the diverter (42) is provided with a rib, and the other is provided with a groove, and the rib and the groove are matched for limiting.

8. The pre-filter diversion assembly according to claim 1, characterized in that, The outer periphery of the diversion housing (41) has an upper shoulder (4111) and a lower shoulder (4121) spaced apart vertically. The lower shoulder (4121) is configured to abut against the filter cartridge (20) located on the lower side of the diversion housing (41), and the upper shoulder (4111) is configured to abut against the valve head (11) sleeved on the outside of the diversion housing (41).

9. The pre-filter diversion assembly according to claim 8, characterized in that, A first sealing ring (43) is provided between the upper shoulder (4111) and the valve head (11), and a second sealing ring (44) is provided between the lower shoulder (4121) and the filter cylinder (20).

10. A pre-filter, characterized in that, The filter includes a valve head (11), a bottle body (12) connected to the lower port of the valve head (11), a filter cartridge (20) disposed in the bottle body (12), a scraping assembly (30) rotatably disposed in the filter cartridge (20), and a diversion assembly of the pre-filter as described in any one of claims 1-9, wherein the diversion housing (41) is disposed between the top of the filter cartridge (20) and the valve head (11); When the diverter (42) is in the filtration position, the water flows through the inner cavity of the diverter housing (41) and enters the inner cavity of the filter cylinder (20) for filtration; When the diverter (42) is located at the sewage discharge position, water flows through the inner cavity of the diverter (42) and drives the scraping assembly (30) to rotate.

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