Pre-filter and water system

Abstract

This invention discloses a pre-filter and a water system, relating to the field of pre-filter technology. The pre-filter includes a housing, a filter assembly, and an outer frame. The housing has a water filtration chamber, an inlet, an outlet, and a drain outlet communicating with the water filtration chamber. The filter assembly is disposed in the water filtration chamber and includes multiple filter modules distributed along a first direction. Each filter module has a water passage chamber, a first water passage, and a second water passage, which communicate with the water filtration chamber. The second water passage has a filter element. The outer frame is rotatably fitted onto the outside of the filter assembly and has a siphon channel, siphon holes communicating with the siphon channel, and a first discharge outlet. The siphon holes are positioned corresponding to the filter elements, and the first discharge outlet communicates with the drain outlet. The outer frame is equipped with an inner cleaning brush, which has a cleaning part for cleaning the outer surface of the filter elements. The technical solution provided by this invention enables rinsing of the filter assembly to ensure its filtration effect.

Description

Technical Field

[0001] This invention relates to the field of pre-filter technology, and particularly to a pre-filter and a water system. Background Technology

[0002] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term neglect and aging, tap water pipes often contain large particles harmful to human health, such as sediment, rust, and red worms, seriously affecting residents' drinking water health. Therefore, pre-filters are installed. These pre-filters contain filter components and other structures to filter large particles from tap water before it reaches the faucet. However, while the pre-filter is filtering the water, impurities accumulate inside the filter chamber, especially on the surface of the filter components. Over time, this can clog the filter components, reducing their filtration efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide a pre-filter and water system that enables flushing of the filter components to ensure their filtration efficiency and extend the service life of the pre-filter.

[0004] To achieve the above objectives, the present invention proposes a pre-filter comprising:

[0005] The housing has a water filter chamber, and an inlet, an outlet and a drain outlet that communicate with the water filter chamber. The inlet is connected to the water supply end and the outlet is connected to the water user end.

[0006] A filter assembly, disposed in the water filtration chamber, includes a plurality of filter modules distributed along a first direction. Each filter module has a water passage chamber, a first water inlet, and a second water inlet. The first water inlet and the second water inlet communicate with the water filtration chamber, and the second water inlet is provided with a filter element.

[0007] The outer frame is rotatably fitted onto the outside of the filter assembly and is provided with a siphon channel, a siphon hole and a first discharge port respectively connected to the siphon channel, the siphon hole being provided corresponding to the filter element, and the first discharge port being connected to the sewage outlet;

[0008] An inner cleaning brush is installed on the inner side of the outer frame. The inner cleaning brush has a cleaning part, which is used to clean the outer surface of the filter element.

[0009] In one embodiment, the filter element is arranged in a ring shape and its axis extends along a first direction. The filter element has an inner ring edge and an outer ring edge, and the outer ring edge is located on one axial side of the inner ring edge. The cleaning part is arranged side by side with the filter element in the first direction.

[0010] In one embodiment, the siphon holes are arranged side by side with the filter element in the first direction, and the siphon channels and the inner cleaning brush are distributed at circumferential intervals along the outer skeleton.

[0011] In one embodiment, the siphon channel includes at least two sidewall channels extending along the first direction and located outside the filter assembly, the sidewall channels having the siphon holes, and at least two internal cleaning brushes, the internal cleaning brushes and the sidewall channels being alternately distributed circumferentially.

[0012] In one embodiment, the same filter module has two opposing filter elements in the first direction, and the two filter elements are arranged in a tapering manner in opposite directions, while the cleaning part is gradually expanded in a direction away from the filter assembly.

[0013] In one embodiment, at least one of the internal cleaning brushes is provided with cleaning portions on opposite sides in the first direction, and the two cleaning portions respectively clean the two adjacent filter elements of the two adjacent filter modules.

[0014] In one embodiment, the inner cleaning brush further includes a base portion, which protrudes from the inner peripheral side of the outer frame (50), and the cleaning portion is connected to the outer peripheral side of the base portion; each base portion is provided with two cleaning portions whose extension directions are opposite to each other in the first direction, and the side of the cleaning portion away from the base portion is interference-fitted with the outer surface of the filter element.

[0015] In one embodiment, the siphon channel includes a sidewall channel extending along the first direction and located on the periphery of the filter assembly. The sidewall channel is provided with a plurality of siphon holes spaced apart along the first direction, and each filter element is provided with at least one siphon hole.

[0016] In one embodiment, the siphon channel further includes a bottom channel connecting the plurality of sidewall channels, the bottom channel having the first discharge port and located on the side of the filter assembly near the drain port.

[0017] In one embodiment, the outer frame includes a cylindrical frame and a bottom cover. The cylindrical frame includes a chassis and a side frame disposed on the chassis. The side wall flow channel is disposed corresponding to the side frame. The siphon hole is disposed on the inner side of the cylindrical frame. The bottom cover and the chassis cover together to form the bottom flow channel. The chassis is provided with the first discharge port. The inner cleaning brush is disposed on the side frame.

[0018] In one embodiment, the pre-filter further includes an impeller assembly disposed in the filtration chamber. The impeller assembly includes a mounting base and an impeller body rotatably disposed in the impeller chamber of the mounting base. The outer frame is kinetically connected to the impeller body. The mounting base is provided with a first inlet communicating with the siphon channel and a drain outlet communicating with the sewage outlet.

[0019] In one embodiment, the bottom of the outer frame is provided with a water-blocking ring, the mounting base is provided with a water-blocking ring, the water-blocking ring and the water-blocking ring cooperate to form a water-blocking channel, and the siphon channel and the first water inlet are connected through the water-blocking channel.

[0020] In one embodiment, the mounting base has a plurality of second water inlets with the same circumferential opening spaced apart on its periphery. The impeller body includes an impeller shaft and a plurality of blades inclinedly disposed on the impeller shaft. Water flow from both the first water inlet and the second water inlet can cause the blades to drive the impeller shaft to rotate.

[0021] In one embodiment, the impeller body includes an impeller shaft. Inside the impeller cavity, a limiting groove is recessed in the cavity wall of the mounting base away from the outer frame. One end of the impeller shaft away from the outer frame is rotatably inserted into the limiting groove.

[0022] In one embodiment, the mounting base is further provided with ball bearings, which are disposed at the bottom of the limiting groove and roll against the impeller shaft.

[0023] In one embodiment, the pre-filter further includes a water distributor for generating swirling flow, and the outer frame is also provided with a water flow drive component, which can drive the outer frame to rotate under the drive of water flow.

[0024] The present invention also proposes a water system including the aforementioned pre-filter.

[0025] The technical solution of this invention involves providing an inner cleaning brush on the inner side of the outer frame. As the outer frame rotates with the water flow, the cleaning part of the inner cleaning brush rotates simultaneously to clean the filter element, causing impurities on the filter element to fall off. These impurities are then drawn into the siphon channel through the siphon holes and discharged into the drain port through the first discharge port. This method effectively flushes the filter assembly, ensuring its filtration efficiency and extending the service life of the pre-filter. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the pre-filter provided by the present invention;

[0028] Figure 2 for Figure 1 Sectional view at point AA;

[0029] Figure 3 for Figure 2 Sectional view at point BB;

[0030] Figure 4 for Figure 3 A magnified view of a section at point C;

[0031] Figure 5 for Figure 3 A schematic diagram showing the positional relationship between the outer frame, filter components, and water distributor in the diagram.

[0032] Figure 6 for Figure 2 A schematic diagram showing the installation relationship between the outer frame and the inner cleaning brush (water flow drive component not shown);

[0033] Figure 7 for Figure 2 A schematic diagram of the exoskeleton structure in the diagram;

[0034] Figure 8 for Figure 7 Exploded view of some parts of the exoskeleton shown;

[0035] Figure 9 for Figure 2 Main view of the inner cleaning brush;

[0036] Figure 10 for Figure 2 A schematic diagram showing the positional relationship between the filter components and the water distributor in the diagram;

[0037] Figure 11 for Figure 10 Front view of the structure shown;

[0038] Figure 12 for Figure 11 Sectional view at point DD;

[0039] Figure 13 for Figure 4 A schematic diagram of the impeller assembly in the diagram.

[0040] Explanation of icon numbers:

[0041] 100. Shell;

[0042] 10. Filter bottle; 101. Filter chamber; 102. Drain outlet;

[0043] 20. Valve head; 201. Inlet; 202. Outlet;

[0044] 30. Filter assembly; 301. First connecting structure; 302. Second connecting structure; 300. Filter module; 320. Filter element; 330. First water inlet; 340. Water passage chamber; 350. Second water inlet;

[0045] 40. Impeller assembly; 401. Impeller cavity; 402. First inlet; 403. Second inlet; 404. Drain outlet; 410. Mounting base; 411. Limiting groove; 424. Water baffle ring; 430. Ball bearing; 440. Impeller body; 441. Impeller shaft; 442. Blade; 446. Flat part;

[0046] 50. Outer frame; 501. Siphon channel; 501a. Side wall channel; 501b. Bottom channel; 502. Water flow drive component; 503. First discharge port; 504. Second discharge port; 510. Cylindrical frame; 511. Chassis; 512. Side frame; 515. Water baffle ring; 518. Snap-fit ​​groove; 520. Bottom cover; 531. Siphon hole; 540. Water baffle plate; 541. Drive surface;

[0047] 60. Water distributor; 601. Guide vane;

[0048] 70. Internal cleaning brush; 710. Cleaning section; 720. Base section;

[0049] 80. Drainage assembly; 820. Drainage valve.

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0053] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0054] Currently, pre-filters are the first coarse filtration device in whole-house water purification systems. They are a type of physical filtration device, mainly used to intercept large particles larger than 40 microns. For example, they can filter out sediment, rust, and large particles in tap water, protecting the safety of downstream water use and preventing the large amount of sediment and impurities generated in urban and residential water supply networks from causing harm to the human body.

[0055] In related technologies, the housing of a pre-filter typically includes a valve head and a filter bottle. The valve head has an inlet and an outlet, and the valve head and filter bottle together form a filtration chamber, within which a filter element is installed. During the use of the pre-filter, impurities adhering to the surface of the filter element need to be periodically rinsed in situ, and then discharged through a drain valve. Therefore, a cylindrical outer frame is formed between the filter element and the chamber wall of the filtration chamber. This outer frame guides the water flow, ensuring filtration efficiency during the filtration process, and also enhancing the rinsing effect on the filtration chamber, especially the filter element, during the rinsing process.

[0056] However, on the one hand, the existing pre-filters have a cylindrical filter structure with a small filtration area, which results in low filtration efficiency.

[0057] On the other hand, during the rinsing process, although the outer frame increases the flow and convergence of water, the impact of the water flow on the internal components of the filter chamber, especially the filter assembly, is low. This means that impurities attached to the filter assembly cannot be thoroughly cleaned, and over time, this can easily cause blockage of the filter assembly, thereby reducing the filtration effect.

[0058] Before introducing the technical solution of this invention, the water filtration process of the pre-filter will be described first. Some pre-filters on the market typically have a flushing function, that is, they can be periodically cleaned to remove previously intercepted large particles, thereby extending the service life of the pre-filter. During the use of the pre-filter, such as... Figures 1 to 3 As shown, tap water first enters the filter chamber 101 of the housing 100 through the inlet 201, where it is filtered by the filter assembly 30. Then, under pressure, the filtered tap water flows out through the outlet 202 to the user (water-using equipment). After a period of use, a certain amount of impurities inevitably accumulate in the filter assembly 30 and the filter chamber 101. At this time, the outlet 202 can be closed, and the drain port 102 of the housing 100 can be opened to allow the tap water entering through the inlet 201 to flush the filter assembly 30, the outer frame 50, and the filter chamber 101, thereby improving the filtration capacity of the filter assembly 30.

[0059] This invention proposes a pre-filter.

[0060] Please see Figures 1 to 4 , Figure 8 , Figure 11 and Figure 12 In one embodiment of the present invention, the pre-filter includes:

[0061] The housing 100 has a water filter chamber 101, and a water inlet 201, a water outlet 202 and a sewage outlet 102 that are connected to the water filter chamber 101. The water inlet 201 is connected to the water supply end, and the water outlet 202 is connected to the water user end.

[0062] A filter assembly 30 is disposed in the water filtration chamber 101. The filter assembly 30 includes a plurality of filter modules 300 distributed along a first direction. Each filter module 300 has a water passage chamber 340, a first water inlet 330, and a second water inlet 350. The first water inlet 330 and the second water inlet 350 communicate with the water filtration chamber 101. The second water inlet 350 is provided with a filter element 320.

[0063] The outer frame 50 is located on the outside of the filter assembly 30 and is provided with a siphon channel 501, a siphon hole 531 that is connected to the siphon channel 501 and a first discharge port 503 respectively. The siphon hole 531 is provided corresponding to the filter element 320, and the first discharge port 503 is connected to the sewage outlet 102.

[0064] The technical solution of this invention, by setting a siphon channel 501 and a siphon hole 531 on the outer frame 50, allows impurities and particulate matter intercepted by the filter assembly 30 to be drawn into the siphon hole 531 and the siphon channel 501 by the siphon effect after being impacted by the water flow, and then discharged more efficiently. That is, during the rinsing stage, impurities and particulate matter intercepted by the filter assembly 30 can be more effectively and quickly guided to the drain outlet 102 and ultimately discharged through the drain outlet 102, thereby improving the rinsing effect on the water filter chamber 101, especially the filter assembly 30.

[0065] It is understood that the pre-filter of the present invention can be applied to scenarios including but not limited to water systems. For example, whole-house water purification systems are usually equipped with pre-filters, which are used to filter large particles from tap water. This not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves residents' health.

[0066] It should be noted that the water supply end can be a tap water pipe, a water tower, or well water, and the water consumption end can be a faucet, a shower head, or a drinking water outlet; this application does not impose specific limitations on these aspects. The form and structure of the filter element 320 are not limited; for example, it can be a stainless steel filter screen or a PP cotton filter screen.

[0067] In addition, the term "multiple" in this scheme can be understood as greater than or equal to two.

[0068] Please see Figures 1 to 3 Optionally, the housing 100 includes a valve head 20, a filter bottle 10, and a drain assembly 80. An inlet 201 and an outlet 202 are formed on the valve head 20. The drain assembly 80 is installed on the side of the filter bottle 10 away from the valve head 20, and the drain assembly 80 has a drain channel. The drain outlet 102 is located on the side of the drain channel away from the valve head 20. This results in a simple and easy-to-implement structure. The drain assembly 80 may include a drain valve 820, through which the drain channel can be interrupted or connected.

[0069] Please see Figure 4 Optionally, the siphon hole 531 is arranged side-by-side with the filter element 320 in the first direction. This allows the siphon hole 531 to be positioned as close as possible to the filter element 320, thereby promptly removing impurities that have detached from the filter element 320 during the rinsing phase. Of course, in other embodiments, the siphon hole 531 may be offset from the filter element 320 in the first direction.

[0070] Please see Figure 4 and Figure 12Optionally, the filter element 320 is at least partially inclined. By inclining the filter element 320 at least partially, compared to a cylindrical structure extending axially, the filtration area of ​​the filter element 320 is increased. With the same axial height, the filtration area of ​​the filter element 320 can be increased. Due to the increased filtration area, the filter element 320 can withstand a larger flow load, thus improving filtration efficiency. Furthermore, because the filtration area of ​​the filter element 320 is sufficiently large, even if a localized area of ​​the filter element 320 becomes clogged, the remaining areas can continue to withstand a large flow load, helping to extend the service life of the filter module 300, reduce replacement frequency, and thereby lower maintenance costs.

[0071] Secondly, the filter assembly 30 of this solution includes multiple filter modules 300. Since the filtration area of ​​each filter module 300 is fixed, this solution can increase the total filtration area of ​​the filter assembly 30 by setting multiple filter modules 300, thereby improving the filtration efficiency. Moreover, when the filter element 320 of a single filter module 300 is tilted, setting multiple filter modules 300 can further utilize the space and form a larger filtration area.

[0072] Please see Figure 4 and Figure 12 Optionally, the filter element 320 is arranged in a ring shape, with its axis extending along a first direction. The filter element 320 has an inner ring edge and an outer ring edge, with the outer ring edge located on one axial side of the inner ring edge. The siphon hole 531 is arranged side-by-side with the outer ring edge in the first direction. It can be understood that the outer ring edge is closer to the inner side of the outer frame 50 than the inner ring edge, and the filter element 320 has a structure that extends obliquely from the inner ring edge towards the outer ring edge, allowing impurities that fall off the filter element 320 to flow along the outer surface of the filter element 320 to the outer ring edge and be sucked in by the siphon hole 531 adjacent to the outer ring edge. This improves the siphon effect and its efficiency. Of course, in other embodiments, the siphon hole 531 may also be arranged side-by-side with the inner ring edge in the first direction, or the siphon hole 531 may be located between the inner and outer ring edges in the first direction.

[0073] Please see Figure 12Optionally, the same filter module 300 has two opposing filter elements 320 in a first direction, and the two filter elements 320 are arranged in a tapering manner in opposite directions. A siphon hole 531 is provided corresponding to at least one of the two filter elements 320. Thus, the two filter elements 320 of the same filter module 300 are arranged in a tapering manner in opposite directions, forming an outward-facing funnel-shaped space between adjacent filter elements 320 of adjacent filter modules 300. This funnel-shaped space facilitates the flow of impurities detached from the filter elements 320 to the siphon hole 531. Optionally, in this embodiment, both filter elements 320 on the same filter module 300 are provided with a corresponding siphon hole 531, so that impurities detached from each filter element 320 can be specifically absorbed by its corresponding siphon hole 531, thereby improving the siphon effect and efficiency. Of course, in other embodiments, the two filter elements 320 on the same filter module 300 may only have one corresponding siphon hole 531.

[0074] Please see Figure 12 Optionally, the filter module 300 is provided with a first connection structure 301 and a second connection structure 302 on both sides distributed along the first direction. The first connection structure 301 of one filter module 300 is used to detachably connect with the second connection structure 302 of another filter module 300 so that the two filter modules 300 are fixed together.

[0075] The technical solution of the present invention provides a first connecting structure 301 and a second connecting structure 302 on both sides of the filter module 300 along the first direction, and the first connecting structure 301 and the second connecting structure 302 can cooperate and fasten each other. In this way, the number of filter modules 300 can be flexibly adjusted according to the model of the pre-filter (e.g., but not limited to the size of the filter bottle 10), thereby achieving the effect of adjusting the size of the filter assembly 30. This solves the problem of sharing filter assemblies 30 for different models of pre-filters. Since the filtration area on each filter module 300 is fixed, adjusting the number of filter modules 300 can also achieve the effect of adjusting the total filtration area of ​​the filter assembly 30, thereby setting a suitable filtration area and improving the filtration effect.

[0076] Secondly, since each filter module 300 has a first connection structure 301 and a second connection structure 302 on both sides, the user can pick up any two filter modules 300 and connect and fix them. This avoids the user having to find a compatible filter module 300 to install, thereby improving the installation efficiency of the filter assembly 30.

[0077] Furthermore, the first connection structure 301 of one filter module 300 is detachably connected to the second connection structure 302 of another filter module 300. This detachable connection allows for easy separation of components without damaging the connector itself or adjacent parts. This feature enables the filter assembly 30 to be operated quickly and efficiently when maintenance or replacement of the filter module 300 is required, reducing maintenance difficulty and cost. Because the detachable connection is easy to operate, it significantly saves time when maintaining the filter assembly 30 and replacing the filter module 300. Moreover, the detachable connection allows for the rapid replacement of faulty filter modules 300, thereby reducing water system downtime and improving maintenance efficiency. Secondly, compared to non-detachable connections, detachable connections reduce the likelihood of entire components being scrapped due to the inability to disassemble, reducing resource waste. Furthermore, the detachable connection allows for periodic or irregular inspection and maintenance of the filter assembly 30 to ensure its stability and safety, which helps to promptly identify and resolve potential safety hazards.

[0078] Please see Figure 12 In one embodiment, a first connecting structure 301 of a filter module 300 is used to snap onto a second connecting structure 302 of another filter module 300. It is understood that the snap-on assembly method eliminates the need for additional locking components such as screws and nuts, thereby reducing the manufacturing and assembly costs of the filter assembly 30. Furthermore, due to the flexible snap-on design, it can be customized according to the actual needs of the filter module 300, reducing material waste and improving material utilization. Secondly, the snap-on design allows for rapid assembly and disassembly without complex tools and equipment. This greatly improves production and assembly efficiency, and also facilitates the maintenance and replacement of the filter module 300. Moreover, the snap-on operation is simple and easy to master. Whether it's a worker on the production line or an ordinary consumer, they can easily complete the assembly and disassembly work.

[0079] Of course, in other embodiments, the first connecting structure 301 of a filter module 300 can be detachably connected to the second connecting structure 302 of another filter module 300 by screws or rivets, or the first connecting structure 301 and the second connecting structure 302 can be directly welded or bonded together.

[0080] Please see Figure 4 , Figure 6 and Figure 8Optionally, the siphon channel 501 includes a sidewall channel 501a extending along a first direction and located on the outer side of the filter assembly 30. The sidewall channel 501a is provided with a plurality of siphon holes 531 spaced apart along the first direction, and each filter element 320 is provided with at least one siphon hole 531. Thus, during the rinsing stage, particles detached from each filter element 320 can be guided and discharged by at least one siphon hole 531, further improving the rinsing effect. Of course, in other embodiments, one siphon hole 531 can also be provided for multiple filter elements 320. For example, one siphon hole 531 can be located between two adjacent filter elements 320 to correspondingly handle the siphoning effect of two filter elements 320.

[0081] Please see Figure 8 To further improve rinsing efficiency and effectiveness, optionally, at least two sidewall channels 501a are provided, with the at least two sidewall channels 501a spaced apart on opposite sides of the filter assembly 30. In this way, the multiple siphon holes 531 on the multiple sidewall channels 501a work simultaneously, providing a more efficient siphon effect on the filter element 320. Optionally, in this embodiment, two sidewall channels 501a are provided. Of course, in other embodiments, three or more sidewall channels 501a may be provided, or only one sidewall channel 501a may be provided.

[0082] Please see Figure 8 Furthermore, the siphon channel 501 also includes a bottom channel 501b connecting multiple sidewall channels 501a. The bottom channel 501b has a first discharge port 503 and is located on the side of the filter assembly 30 near the drain port 102. In this way, the water flow in the multiple sidewall channels 501a is collected together by the bottom channel 501b and then discharged through the first discharge port 503, which can improve the siphon effect and simplify the structure of the outer frame 50. Of course, in other embodiments, the bottom channel 501b may not be provided, and the first discharge port 503 may be directly formed at the lower end of the sidewall channels 501a.

[0083] Please refer to the figure. Figure 6 and Figure 8Furthermore, the outer frame 50 includes a cylindrical frame 510 and a bottom cover 520. The cylindrical frame 510 includes a chassis 511 and a side frame 512 disposed on the chassis 511. The side wall flow channel 501a is disposed corresponding to the side frame 512, and the siphon hole 531 is disposed on the inner side of the cylindrical frame 510. The bottom cover 520 is closed with the chassis 511 to form a bottom flow channel 501b, and the chassis 511 is provided with a first discharge port 503. By designing the bottom flow channel 501b between the chassis 511 and the bottom cover 520, compared with setting a through bottom flow channel 501b inside the chassis 511, the structure is simpler and easier to manufacture. On the other hand, it is easier to clean, reducing the possibility of dirt accumulating inside and clogging the filter element 320, thus avoiding siphon failure. Moreover, compared with the existing solution, it is easier to increase the size of the siphon flow channel 501 and improve the cleaning effect.

[0084] Please see Figure 4 The siphon channel 501 is L-shaped, the side wall channel 501a is the vertical part of the L-shape, and the bottom channel 501b is the horizontal part of the L-shape. The side wall channel 501a is set in the side frame 512, which means that the side wall channel 501a is set in the side frame 512, and does not limit the formation method of the side wall channel 501a.

[0085] Please see Figure 8 Furthermore, to enhance drainage efficiency, the chassis 511 is also provided with a second discharge port 504, which connects the inside of the cylinder frame 510 to the outside of the cylinder frame 510. The addition of the second discharge port 504 provides an additional drainage channel for water accumulation inside the cylinder frame 510, helping to accelerate water flow and improve drainage efficiency. During filter operation, especially under high flow or high pressure conditions, this design significantly reduces the risk of water accumulation inside the cylinder frame 510, ensuring smooth filter operation. By timely draining water from the inside of the cylinder frame 510, the residence time of water between the filter assembly 30 and the cylinder frame 510 can be reduced, which helps improve the overall filtration effect of the pre-filter.

[0086] Based on the water accumulation and drainage requirements inside the siphon frame 510, multiple second discharge ports 504 can be installed on the chassis 511. These second discharge ports 504 can be evenly distributed or strategically arranged according to the water accumulation area to maximize drainage efficiency. Specifically, multiple second discharge ports 504 are provided, located between two adjacent siphon channels 501 and closer to the outer side of the chassis 511 relative to the first discharge port 503. The second discharge ports 504 are arranged symmetrically with the first discharge port 503 to maintain the balance and aesthetics of the overall structure. This arrangement also helps to distribute drainage pressure and improve drainage efficiency.

[0087] Please see Figure 8Optionally, in this embodiment, the outer frame 50 is designed with three siphon channels 501, each evenly distributed at 120° intervals. The wall surface of the siphon component is designed with seven siphon holes 531, each elliptical in shape. The number and layout of the siphon holes 531 are related to the number and structure of the filter assembly 30 modules and can be flexibly arranged.

[0088] The base 511 and side frame 512 can be integrally formed, or the side frame 512 can be fixed to the base 511 by screws or other means. The base 511 of the cylindrical frame 510 is circular, and the side frame 512 surrounds the base 511 and is designed around the outer edge of the filter assembly 30. The side frame 512 is usually presented as a ring or part of a cylinder, but is not completely closed to allow water flow. The shape of the side frame 512 matches the shape of the filter assembly 30 to ensure that it can fit tightly and support the filter assembly 30, while maintaining effective circulation of water around the filter assembly 30.

[0089] Please see Figure 4 , Figure 5 and Figure 8 Optionally, the bottom cover 520 and the chassis 511 are joined to form a bottom flow channel 501b. In one embodiment, the bottom flow channel 501b is provided on the bottom cover 520. For ease of disassembly, the bottom cover 520 and the chassis 511 are detachably connected, for example, by screw fastening or snap-fitting. The detachable bottom cover 520 design makes cleaning and maintenance simple and convenient, allowing users to perform these tasks themselves without needing professional service, thereby reducing maintenance costs.

[0090] In one embodiment, the outer frame 50 is rotatably sleeved on the outside of the filter assembly 30. The outer frame 50 or the filter assembly 30 is equipped with an electrically driven / manually driven cleaning mechanism. The cleaning mechanism cleans the impurities attached to the surface of the filter element 320 and then discharges them through the drain valve 820. Through the multiple siphon holes 531 of the side wall flow channel 501a, the impurities, particles, etc. intercepted by the filter assembly 30 can be more effectively guided to the bottom flow channel 501b and finally discharged through the drain port 102.

[0091] Please see Figure 2 , Figure 6 and Figure 9In a further embodiment, the cleaning mechanism includes an inner cleaning brush 70 located inside the outer frame 50. The inner cleaning brush 70 has a cleaning section 710 for cleaning the outer surface of the filter element 320. As the outer frame 50 rotates with the water flow, the cleaning section 710 rotates along with it to clean the filter element 320, causing impurities on the filter element 320 to fall off. These impurities are then drawn into the siphon channel 501 through the siphon hole 531 and discharged into the drain port 102 through the first discharge port 503. Thus, this application can improve the rinsing effect of the pre-filter on the filter assembly 30 during the rinsing stage.

[0092] In an embodiment where the outer frame 50 includes a side frame 512, optionally, an inner cleaning brush 70 is disposed on the side frame 512.

[0093] Please see Figure 2 , Figure 9 and Figure 12 Optionally, the filter element 320 is arranged in a ring shape, with its axis extending along a first direction. The filter element 320 has an inner ring edge and an outer ring edge, with the outer ring edge located on one axial side of the inner ring edge. The cleaning part 710 is arranged side-by-side with the filter element 320 in the first direction. This allows for a more compact structure and avoids the problem of excessively long suspended portions of the inner cleaning brush 70, thereby improving the structural stability and reliability of the inner cleaning brush 70. Of course, in other embodiments, the cleaning part 710 may be offset from the filter element 320 in the first direction.

[0094] Please see Figure 2 , Figure 3 and Figure 6 Optionally, the siphon holes 531 are arranged side-by-side with the filter element 320 in the first direction, and the siphon channels 501 and the inner cleaning brush 70 are distributed at intervals along the circumference of the outer frame 50. Specifically, during the process of the outer frame 50 driving the inner cleaning brush 70 to rotate and brush the outer surface of the filter element 320, the inner cleaning brush 70 and the siphon channels 501 are equivalent to having an upstream and downstream relationship along the circumference, so that after the impurities on the filter element 320 are brushed off by the inner cleaning brush 70, they can be sucked away by the siphon holes 531 on the siphon channels 501 that rotate immediately afterward, thereby improving the rinsing effect and efficiency. Of course, in other embodiments, the inner cleaning brush 70 and the siphon channels 501 may also be located at the same position along the circumference of the outer frame 50.

[0095] Please see Figure 6Optionally, the siphon channel 501 includes at least two sidewall channels 501a extending along a first direction and located on the outer side of the filter assembly 30. The sidewall channels 501a are provided with siphon holes 531. At least two inner cleaning brushes 70 are provided, and the inner cleaning brushes 70 and sidewall channels 501a are alternately distributed circumferentially. This improves the efficiency and effect of brushing and siphoning during the rinsing stage. Of course, in other embodiments, only one siphon channel 501 and one inner cleaning brush 70 may be provided.

[0096] Please see Figure 2 , Figure 9 and Figure 12 Optionally, the same filter module 300 has two opposing filter elements 320 in the first direction, and the two filter elements 320 are arranged in a tapering manner in opposite directions, while the cleaning section 710 is gradually expanded in the direction away from the filter assembly 30. Thus, the two filter elements 320 of the same filter module 300 are tapering in opposite directions, forming an outward-facing funnel-shaped space between adjacent filter elements 320 of adjacent filter modules 300. This funnel-shaped space facilitates the flow of impurities detached from the filter elements 320 to the siphon hole 531. Furthermore, the two opposing sides of the cleaning section 710 in the first direction can more thoroughly clean the outer surface of the filter elements 320. Of course, in other embodiments, the two filter elements 320 may also be arranged in a gradually expanding manner in opposite directions.

[0097] It should be noted that, Figure 9 The isometric view and front view of the internal cleaning brush 70 are also shown, with the isometric view located at... Figure 9 The left-hand area, while the main view is located in Figure 9 The right side region. As can be seen from the front view of the inner cleaning brush 70, the height dimension of the cleaning part 710 in the first direction gradually increases in the direction away from the filter assembly 30, so as to be able to fit and abut against the two filter elements 320 located in the flared space.

[0098] Optionally, at least one internal cleaning brush 70 has cleaning sections 710 on both opposite sides in the first direction, and the two cleaning sections 710 respectively clean two adjacent filter elements 320 of two adjacent filter modules 300. That is, the internal cleaning brush 70 is correspondingly provided at the connection between two adjacent filter modules 300, and can simultaneously clean the two filter elements 320 of these two adjacent filter modules 300 that are facing each other. In this way, the cleaning efficiency and effect can be improved. Of course, in other embodiments, one internal cleaning brush 70 may only have one cleaning section 710.

[0099] Please see Figure 9Optionally, the inner cleaning brush 70 also includes a base portion 720, which protrudes from the inner periphery of the outer frame 50, and a cleaning portion 710 is connected to the outer periphery of the base portion 720. Each base portion 720 has two cleaning portions 710 extending in opposite directions in a first direction. The side of the cleaning portion 710 away from the base portion 720 is press-fitted with the outer surface of the filter element 320. This allows the cleaning portion 710 to exert a certain frictional force on the filter element 320, thereby improving the cleaning effect, without affecting the relative movement between the cleaning portion 710 and the filter element 320.

[0100] Please see Figure 9 In this embodiment, the internal cleaning brush 70 has two types of structures. For the internal cleaning brush 70 located at the connection point of the two filter modules 300, two cleaning portions 710 extending axially opposite to each other on the outer frame 50 are provided on a base portion 720. For the internal cleaning brush 70 located at the end of the filter assembly 30, only one cleaning portion 710 needs to be provided on the base portion 720. The structure of this internal cleaning brush 70 can be a combination of the aforementioned internal cleaning brush 70 structures. Without loss of generality, in the former type of internal cleaning brush 70, the base portion 720 can be cylindrical, with the two cleaning portions 710 distributed on both sides of the axis of the cylindrical body. In the latter type of internal cleaning brush 70, the base portion 720 is configured as a semi-cylindrical shape, with the cleaning portions 710 connected to the circumferential surface of the cylindrical body.

[0101] In one embodiment, the exoskeleton 50 is rotatable relative to the filter assembly 30, for example, see [link to relevant documentation]. Figure 3 , Figure 5 , Figure 7 and Figure 10 The pre-filter also includes a water distributor 60 for generating swirling flow, and the outer frame 50 is also provided with a water flow drive 502, which can drive the outer frame 50 to rotate under the drive of water flow. In this way, the raw water entering through the filter bottle 10 drives the outer frame 50 to rotate relative to the filter assembly 30, so that the water inside the filter bottle 10 generates swirling flow, which can not only improve the effect of water flow rinsing the filter assembly 320, but also make the sewage discharge from the drain port 102 more quickly.

[0102] Of course, in other embodiments, the outer frame 50 may rotate relative to the filter assembly 30 by means of an electrically driven or manually driven rotation structure.

[0103] Please see Figure 7 and Figure 10Optionally, the water distributor 60 is positioned closer to the water inlet 201 than the water flow drive component 502. The water distributor 60 has multiple guide vanes 601 that are relatively axially inclined distributed circumferentially. The outer frame 50 is provided with multiple water flow drive components 502, which are spaced apart circumferentially along the outer frame 50. Multiple baffles 540 are spaced apart circumferentially along the side frame 512 of the water flow drive components 502. Each baffle 540 has a drive surface 541 extending in a first direction.

[0104] It is understood that the water distributor 60 is located between the water flow drive 502 and the water inlet 201. Water flowing from the water inlet 201 must first pass through the water distributor 60 before flowing to the water flow drive 502. The water distributor 60 has multiple guide vanes 601 distributed circumferentially around the filter assembly 30. The guide vanes 601 extend obliquely relative to the axial direction of the filter assembly 30, and a relatively axially oblique flow channel is formed between two adjacent guide vanes 601. Multiple such flow channels are present circumferentially on the filter assembly 30. Furthermore, the oblique orientation of the guide vanes 601 is opposite or obliquely opposite to the drive surface 541. Thus, under the guiding action of the guide vanes 601, the water flowing through the aforementioned flow channels can impact the drive surface 541 perpendicularly or nearly perpendicularly, ensuring not only the magnitude of the driving force for rotating the outer frame 50, but also ensuring the stable rotation of the outer frame 50. Moreover, while ensuring that the drive surface 541 can drive the outer frame 50 to rotate in the circumferential direction of the side frame 512, the inclination of the drive surface 541 can also be flexibly adjusted to adapt to various water flow environments.

[0105] It should be noted that on the side of the water distributor 60 near the inlet 201, the water flow can fully cover the water distributor 60, so that the direction of the water flow can be adjusted by any guide vane 601, and the water distributor 60 is fixedly connected to the housing 100. Correspondingly, there is a gap between the water distributor 60 and the water flow drive component 502 to ensure that the water flow guided by the guide vane 601 can impact the corresponding drive surface 541. The water flow drive component 502 and the side frame 512 can rotate relative to the housing 100 within the filter chamber 101. Specifically, the water distributor 60 causes the water flow to flow in a circumferential vortex along the axial direction of the filter assembly 30, and the drive surface 541 extends along the axial direction (i.e., the first direction) of the filter assembly 30, thereby generating a maximum circumferential driving force on the outer frame 50, improving the rotation speed of the outer frame 50 and the cleaning effect of the inner cleaning brush 70 on the filter assembly 30.

[0106] Please see Figure 4 and Figure 13Furthermore, the pre-filter also includes an impeller assembly 40 disposed in the filter chamber 101. The impeller assembly 40 includes a mounting base 410 and an impeller body 440 rotatably disposed in the impeller chamber 401 of the mounting base 410. The mounting base 410 is provided with a first inlet 402 communicating with the siphon channel 501 and a drain outlet 404 communicating with the sewage outlet 102.

[0107] During the flushing phase of the pre-filter, when the drain valve 820 is opened, water flows in through the first inlet 402 of the impeller assembly 40. The impeller body 440 rotates under the impact of the water flow. This rotational motion generates a vortex effect, causing the water to be more strongly agitated inside the filter bottle 10, thereby more effectively removing impurities and dirt adhering to the surface of the filter media. Compared to still water flow, the dynamic cleaning of the impeller assembly 40 can significantly improve the efficiency and effect of flushing. In addition, the rotational motion of the impeller body 440 can agitate the impurities and dirt inside the filter bottle 10, suspending them in the water. As the water flows out of the filter bottle 10 through the drain valve 820 and the drain port 102, it prevents impurities from redepositing on the filter media, ensuring the thoroughness of the flushing process. Furthermore, by enhancing the flushing effect, the impeller assembly 40 can effectively prevent the filter media from clogging, maintain unobstructed water flow, and maintain the filtration efficiency of the pre-filter. This is crucial for maintaining stable water pressure and clean water quality in domestic or commercial systems.

[0108] In addition, the impeller assembly 40 is arranged upstream of the drain outlet 102. The impeller assembly 40 generates centrifugal force by rotating, which can make the water flowing out of the drain outlet 102 swirl, thereby improving the drainage effect and flushing efficiency and reducing water waste. The design of the impeller assembly 40 helps to achieve a more environmentally friendly and energy-saving filtration system.

[0109] The impeller assembly 40 of this invention can be used independently in traditional pre-filters. Traditional pre-filters mostly employ a simple drain valve 820 design, where water is flushed across the surface of the filter assembly 30 to remove some impurities by opening the drain valve 820. However, this method often has low drainage efficiency and struggles to thoroughly remove stubborn dirt from inside the filter assembly 30, especially for small particles and adhesive impurities. By incorporating the impeller assembly 40 into the drainage system, the impeller body 440 is driven to rotate by water flow, which not only enhances the flushing force and agitation effect of the water flow, improving drainage efficiency and cleanliness, but also allows for a relatively simple and low-cost design of the impeller assembly 40, requiring no additional energy consumption, thus helping to reduce overall operating costs and water waste.

[0110] Furthermore, the outer frame 50 is connected to the impeller body 440 in a transmission connection, enabling the impeller body 440 to rotate in the same direction as the outer frame 50 during the rinsing stage and provide additional rotational driving force to the outer frame 50. That is, the water distributor 60 and the water flow drive component 502 cooperate to provide rotational driving force to the outer frame 50, and the impeller body 440 itself rotates due to the impact of the water flow and links with the outer frame 50, which can also provide rotational driving force to the outer frame 50. Moreover, these two rotational driving forces are set in the same direction.

[0111] Optionally, the outer frame 50 is combined with the inner cleaning brush 70. The rotation of the outer frame 50 and the impeller body 440 drives the inner cleaning brush 70 to automatically clean the surface of the filter element 320, effectively removing impurities attached to the filter element 320 and reducing the frequency and difficulty of manual cleaning.

[0112] There are various structural forms for achieving the transmission connection between the outer frame 50 and the impeller body 440. For example, please refer to... Figure 4 and Figure 13 In one embodiment, the outer frame 50 is recessed with a snap-fit ​​groove 518 on the side facing the mounting base 410, the impeller body 440 includes an impeller shaft 441, the impeller shaft 441 is provided with at least one flat part 446 in the circumferential direction, the impeller shaft 441 is inserted into the snap-fit ​​groove 518, and the flat part 446 is adapted to abut against the side groove wall of the snap-fit ​​groove 518.

[0113] It is understandable that the snap-fit ​​groove 518 and the end of the impeller shaft 441 are fitted together or with an interference fit. In the circumferential direction of the snap-fit ​​groove 518, a flat portion 446 is provided between the snap-fit ​​groove 518 and the impeller shaft 441. During the rotation of the impeller body 440, the flat portion 446 can prevent the two from sliding against each other, thereby pulling the outer frame 50 to rotate. In addition, the impeller shaft 441 and the snap-fit ​​groove 518 have axially inserted portions, improving the efficiency of power transmission.

[0114] Of course, in other embodiments, the outer frame 50 may have a plurality of first protrusions distributed circumferentially on the side facing the mounting base 410, and the impeller shaft 441 may have a plurality of second protrusions at the end near the outer frame 50. The plurality of second protrusions are distributed circumferentially along the impeller shaft 441, and a first protrusion is engaged between two adjacent second protrusions.

[0115] Please see Figure 8 It is worth mentioning that the three siphon channels 501 at the bottom of the outer frame 50 have a first discharge port 503 set at an angle near the center. The first discharge port 503 set at an angle can allow water to enter the impeller cavity 401 at an angle, thereby improving the rotation efficiency of the impeller body 440.

[0116] Please see Figure 13Optionally, the mounting base 410 has multiple second inlets 403 spaced apart on its periphery with the same circumferential opening. The impeller body 440 includes an impeller shaft 441 and multiple blades 442 inclinedly disposed on the impeller shaft 441. Water flow from the first inlet 402 and the second inlet 403 can cause the blades 442 to drive the impeller shaft 441 to rotate. In this way, by increasing the water flow path and flow rate into the impeller cavity 401 through the first inlet 402 and the second inlet 403, and by providing multiple inlets, the water flow can form a more complex flow pattern in the impeller cavity 401, providing sufficient power for the rotation of the impeller body 440.

[0117] Please see Figure 4 and Figure 13 Specifically, the impeller body 440 includes an impeller shaft 441 and a plurality of inclined blades 442. One side of the blades 442 is curved into an arc surface, with a portion of the arc surface facing the first water inlet 402 and the other portion facing the second water inlet 403. In this way, the blades 442 can be driven by the combined action of the water flow from the second water inlet 403 on the side and the first water inlet 402 on the top, thus driving the impeller shaft 441 to rotate.

[0118] The impeller cavity 401, serving as the enclosed space for the rotation of the impeller body 440, is located inside the mounting base 410. When water flows from the filter bottle 10 through the filter assembly 30, a portion of the water (i.e., the wastewater to be discharged) enters the impeller cavity 401 through the first inlet 402 and the second inlet 403. This interacts with the rotating impeller body 440, generating rotational force and agitation, which helps to flush out residual impurities within the filter assembly 30. When water enters the impeller cavity 401, it impacts the impeller body 440 and causes it to rotate. The rotating impeller body 440 not only enhances the rotational force and agitation of the water flow but also, through its specific blade design 442, guides the water flow to the drain outlet 102, improving discharge efficiency and cleanliness. The drain outlet 404 is located at the bottom or side of the mounting base 410 (usually connected to the drain valve 820), and its main function is to discharge the wastewater treated by the impeller assembly 40 from the pre-filter.

[0119] There are various structural forms for achieving the rotatable connection of the impeller shaft 441, for example, please refer to Figure 4In one embodiment, the impeller body 440 includes an impeller shaft 441. Within the impeller cavity 401, a limiting groove 411 is recessed in the cavity wall of the mounting base 410 away from the outer frame 50. One end of the impeller shaft 441 away from the outer frame 50 is rotatably inserted into the limiting groove 411. This structure is simple and easy to implement. Specifically, the cavity wall of the impeller cavity 401 away from the outer frame 50 is the cavity wall of the impeller cavity 401 relative to the first clearance opening. The end of the impeller shaft 441 is rotatably inserted into the limiting groove 411 along the axial direction. The limiting groove 411 cooperates with the snap-fit ​​groove 518 to respectively limit the two ends of the impeller shaft 441, thereby preventing eccentricity during the rotation of the impeller body 440 and ensuring the stability of the impeller body 440 in pulling the outer frame 50 to rotate. Without loss of generality, the end of the impeller shaft 441 inserted into the limiting groove 411 is smaller than the maximum diameter of the impeller shaft 441, and is presented as a protruding post protruding from the end of the impeller shaft 441. In this way, the side of the impeller shaft 441 facing the cavity wall where the limiting groove 411 is located has a stepped surface that abuts against the cavity wall. This not only provides good stability in circumferential rotation, but also limits the impeller body 440 in the axial direction, preventing the impeller body 440 from axially vibrating.

[0120] Please refer to Figure 4 Furthermore, the mounting base 410 is also provided with ball bearings 430, which are disposed at the bottom of the limiting groove 411 and roll against the impeller shaft 441. It should be noted that the ball bearings 430 can freely rotate and roll within the limiting groove 411. During the rotation of the impeller body 440, rolling friction occurs between the ball bearings 430 and the impeller shaft 441, reducing the frictional force on the impeller shaft 441 and thus improving the smoothness and efficiency of the impeller body 440's rotation. Simultaneously, the ball bearings 430 also reduce the length of the protrusion of the impeller shaft 441 inserted into the limiting groove 411, improving the protrusion's bending resistance and ensuring that the impeller shaft 441 can withstand the water flow impact force, thereby improving the rotational stability of the impeller body 440. Of course, in other embodiments, the ball bearings 430 may not be provided, and the surfaces of the impeller shaft 441 and the limiting groove 411 that abut against each other may be made relatively smooth, using sliding friction for rotational support.

[0121] Please see Figure 4 and Figure 13The bottom of the outer frame 50 is provided with a water-blocking ring 515, and the mounting base 410 is provided with a water-blocking ring 424. The water-blocking ring 515 and the water-blocking ring 424 cooperate to form a water-blocking channel, through which the siphon channel 501 and the first inlet 402 are connected. Specifically, the mounting base 410 is provided with second inlets 403 on both opposite sides. Water in the filter bottle 10, except for the siphon channel 501, can enter through these two second inlets 403 during sewage discharge. The mounting base 410 is designed with four angled first inlets 402. Water flowing out of the siphon channel 501 enters the impeller cavity 401 through the first inlets 402. The upper part of the mounting base 410 is designed with a water-blocking ring 424, which cooperates with the water-blocking ring 424 of the outer frame 50 to prevent excessive water from flowing into the first inlets 402 on the upper part of the mounting base 410.

[0122] It is understood that the pre-filter of the present invention has a filtration mode and a flushing mode, wherein the flushing mode is a positive flushing mode.

[0123] Specifically, in the filtration mode, the outlet 202 is open and the drain valve 820 is closed. Water from the supply end flows into the housing 100 from the inlet 201, and then flows through the water distributor 60 to the water flow drive 502 and the filter chamber 101. At this time, the water flow drive 502 is impacted by the water flow from the water distributor 60 and rotates, which drives the outer frame 50 to rotate and causes the water in the filter chamber 101 to generate a swirling motion. The water in the filter chamber 101 is filtered by the filter element 320 as it flows into the water chamber 340 through the second water outlet 350. That is, the water flowing into the water chamber 340 is clean water. This clean water can flow towards the valve head 20 in the first direction (adjacent filter modules 300 are connected through the first water outlet 330), and flow out from the first water outlet 330 closest to the valve head 20 to the central through hole of the water distributor 60, and then flow from the central through hole to the outlet 202 of the valve head 20, and finally flow out from the outlet 202 to the water user.

[0124] It can be seen that, in the filtration mode, the general flow direction of the water entering the housing 100 is as follows: first, it flows away from the valve head 20 along the axial direction of the filter assembly 30, then it flows from the outer periphery of the filter assembly 30 to the center of the filter assembly 30 along the radial direction of the filter assembly 30, and then it flows closer to the valve head 20 along the axial direction of the filter assembly 30.

[0125] In flushing mode, the outlet 202 is closed and the drain valve 820 is open. Water from the supply end flows into the housing 100 through the inlet 201, and then flows through the water distributor 60 to the water flow drive 502 and the filter chamber 101. At this time, the water flow drive 502 is impacted by the water flow from the water distributor 60 and rotates, which in turn drives the outer frame 50 to rotate, causing the water in the filter chamber 101 to swirl. The swirling water can wash the outer surface of the filter element 320. At the same time, the inner cleaning brush 70 rotates with the outer frame 50 to scrub the outer surface of the filter element 320. The water in the filter chamber 101 carries impurities that have fallen off the filter element 320. Part of the water flows into the siphon channel 501 from the siphon hole 531 and flows to the first discharge port 503, while the other part flows directly to the second discharge port 504 located at the bottom of the outer frame 50. Water flowing from the first discharge port 503 and the second discharge port 504 flows into the impeller cavity 401 and drives the impeller body 440 to rotate. Then, it flows from the drain port 404 located at the bottom of the impeller cavity 401 to the sewage outlet 102, and finally flows out to the outside through the sewage outlet 102.

[0126] It can be seen that, in the flushing mode, the general flow direction of the water entering the housing 100 is as follows: first, it flows along the axial direction of the filter assembly 30 away from the valve head 20; then, a portion of it flows radially from the inner side of the outer frame 50 to the siphon channel 501, and then flows through the siphon channel 501 to the first discharge port 503; another portion flows directly to the second discharge port 504; then it flows further away from the valve head 20 into the impeller assembly 40, and finally flows to the drain port 102.

[0127] The present invention also proposes a water system including a pre-filter. The specific structure of the pre-filter is as described in the above embodiments. Since the water system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0128] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that, include: The housing has a water filter chamber, and an inlet, an outlet and a drain outlet that communicate with the water filter chamber. The inlet is connected to the water supply end and the outlet is connected to the water user end. A filter assembly is disposed in the water filtration chamber and includes a plurality of filter modules distributed along a first direction. Each filter module is provided with a water passage chamber, a first water inlet and a second water inlet. The first water inlet and the second water inlet are connected to the water filtration chamber, and the second water inlet is provided with a filter element. as well as The outer frame is rotatably fitted onto the outside of the filter assembly and is provided with a siphon channel, a siphon hole and a first discharge port respectively connected to the siphon channel, the siphon hole being provided corresponding to the filter element, and the first discharge port being connected to the sewage outlet; An inner cleaning brush is installed on the inner side of the outer frame. The inner cleaning brush is provided with a cleaning part, which is used to clean the outer surface of the filter element. The pre-filter also includes an impeller assembly disposed in the filtration chamber. The impeller assembly includes a mounting base and an impeller body rotatably disposed in the impeller chamber of the mounting base. The outer frame is drivenly connected to the impeller body. The mounting base is provided with a first inlet communicating with the siphon channel and a drain outlet communicating with the sewage outlet. The bottom of the outer frame is provided with a water-blocking ring, and the mounting base is provided with a water-blocking ring. The water-blocking ring and the water-blocking ring cooperate to form a water-blocking channel. The siphon channel and the first water inlet are connected through the water-blocking channel. The mounting base has multiple second water inlets with the same circumferential opening spaced apart on its periphery. The impeller body includes an impeller shaft and multiple blades inclinedly arranged on the impeller shaft. Water flow from both the first and second water inlets can cause the blades to drive the impeller shaft to rotate.

2. The pre-filter as described in claim 1, characterized in that, The filter element is arranged in a ring shape, and its axis extends along a first direction. The filter element has an inner ring edge and an outer ring edge, and the outer ring edge is located on one side of the axial direction of the inner ring edge. The cleaning part is arranged side by side with the filter element in the first direction.

3. The pre-filter as described in claim 2, characterized in that, The siphon holes are arranged side by side with the filter element in the first direction, and the siphon channels and the inner cleaning brush are distributed at intervals along the circumference of the outer skeleton.

4. The pre-filter as described in claim 2, characterized in that, The siphon channel includes at least two sidewall channels extending along the first direction and located on the outside of the filter assembly. The sidewall channels are provided with the siphon holes. The inner cleaning brush is provided with at least two. The inner cleaning brush and the sidewall channels are alternately distributed in the circumferential direction.

5. The pre-filter as described in claim 2, characterized in that, The same filter module has two opposing filter elements in the first direction, and the two filter elements are arranged in a tapering manner in opposite directions, while the cleaning part is gradually expanded in a direction away from the filter assembly.

6. The pre-filter as described in claim 5, characterized in that, At least one of the internal cleaning brushes is provided with cleaning parts on opposite sides in the first direction, and the two cleaning parts respectively clean the two adjacent filter elements of the two adjacent filter modules.

7. The pre-filter as described in claim 5, characterized in that, The inner cleaning brush further includes a base portion, which protrudes from the inner circumferential side of the outer frame, and the cleaning portion is connected to the outer circumferential side of the base portion; each base portion is provided with two cleaning portions extending in opposite directions in the first direction, and the side of the cleaning portion away from the base portion is interference-fitted with the outer surface of the filter element.

8. The pre-filter as described in claim 1, characterized in that, The siphon channel includes a sidewall channel extending along the first direction and located on the periphery of the filter assembly. The sidewall channel is provided with a plurality of siphon holes spaced apart along the first direction, and each filter element is provided with at least one siphon hole.

9. The pre-filter as described in claim 8, characterized in that, The siphon channel also includes a bottom channel that connects to the multiple sidewall channels. The bottom channel is provided with the first discharge port and is located on the side of the filter assembly near the drain port.

10. The pre-filter as described in claim 9, characterized in that, The outer frame includes a cylindrical frame and a bottom cover. The cylindrical frame includes a chassis and a side frame disposed on the chassis. The side wall flow channel is disposed corresponding to the side frame. The siphon hole is disposed on the inner side of the cylindrical frame. The bottom cover and the chassis cover together to form the bottom flow channel. The chassis is provided with the first discharge port. The inner cleaning brush is disposed on the side frame.

11. The pre-filter as claimed in claim 1, characterized in that, The impeller body includes an impeller shaft. Inside the impeller cavity, a limiting groove is recessed in the cavity wall of the mounting base away from the outer frame. One end of the impeller shaft away from the outer frame is rotatably inserted into the limiting groove.

12. The pre-filter as described in claim 11, characterized in that, The mounting base is also provided with ball bearings, which are disposed at the bottom of the limiting groove and roll against the impeller shaft.

13. The pre-filter as described in claim 1, characterized in that, The pre-filter also includes a water distributor for generating swirling flow, and the outer frame is also provided with a water flow drive component, which can drive the outer frame to rotate under the drive of water flow.

14. A water supply system, characterized in that, Includes a pre-filter as described in any one of claims 1 to 13.

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