Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water system, and relates to the technical field of pre-filters, the pre-filter comprises a shell, a filter assembly and an outer skeleton, the shell is provided with a water filtering cavity, a water inlet, a water outlet and a sewage draining exit, the water inlet, the water outlet and the sewage draining exit are communicated with the water filtering cavity, and the filter assembly is arranged in the water filtering cavity and comprises a plurality of filter modules distributed in the first direction; the filtering module is provided with a water passing cavity, a first water passing opening and a second water passing opening, the first water passing opening and the second water passing opening are communicated with the water filtering cavity, and the second water passing opening is provided with a filtering part; the outer framework is rotatably arranged on the outer side of the filtering assembly in a sleeving mode and provided with a siphon flow channel, a siphon hole and a first discharging opening, the siphon hole and the first discharging opening are communicated with the siphon flow channel, the siphon hole corresponds to the filtering piece, and the first discharging opening is communicated with the sewage draining opening; the outer framework is provided with an inner cleaning brush, and the inner cleaning brush is provided with a cleaning part used for cleaning the outer surface of the filtering piece. According to the technical scheme provided by the invention, the filtering assembly can be flushed, so that the filtering effect of the filtering assembly is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pre-filters, in particular to a pre-filter and a water use system. Background Art

[0002] As people's living standards continue to improve, the requirements for daily water use are also getting higher and higher. Due to long-term disrepair and aging of the tap water pipes, there are a large number of large particles in the water that are harmful to the human body, such as mud, rust, and red worms, which seriously affect the health of residents' water use. Therefore, a pre-filter is set up, and a filter component and other structures are provided inside the pre-filter, which can filter large particles before the tap water is used at the faucet. However, while the pre-filter is filtering the water, impurities will adhere to the filter cavity, especially the surface of the filter component, which will clog the filter component over time and reduce the filtering effect of the filter component. Summary of the invention

[0003] The main purpose of the present invention is to provide a pre-filter and a water system, aiming to achieve flushing of the filter assembly to ensure the filtering effect of the filter assembly and to increase the service life of the pre-filter.

[0004] To achieve the above object, the pre-filter proposed by the present invention comprises:

[0005] The housing has a water filter cavity, and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity, wherein the water inlet is connected to the water supply end, and the water outlet is connected to the water use end;

[0006] A filter assembly is disposed in the water filter cavity and includes a plurality of filter modules distributed along a first direction, wherein the filter module is provided with a water passage cavity, a first water passage port and a second water passage port, wherein the first water passage port and the second water passage port are connected to the water filter cavity, and the second water passage port is provided with a filter element; and

[0007] An outer frame is rotatably sleeved on the outer side of the filter assembly and is provided with a siphon flow channel, a siphon hole and a first discharge port respectively connected to the siphon flow channel, the siphon hole is arranged corresponding to the filter element, and the first discharge port is connected to the sewage outlet;

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

[0009] In one embodiment, the filter element is arranged in an annular shape, and the axis extends along the 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 hole is arranged side by side with the filter element in the first direction, and the siphon flow channel and the inner cleaning brush are spaced apart and distributed along the circumference of the outer skeleton.

[0011] In one embodiment, the siphon flow channel includes at least two side wall flow channels extending along the first direction and located on the outside of the filter assembly, the side wall flow channel is provided with the siphon hole, at least two internal cleaning brushes are provided, and the internal cleaning brushes and the side wall flow channels are alternately distributed along the circumferential direction.

[0012] In one embodiment, the same filter module has two opposite filter elements in the first direction, and the two filter elements are arranged in a tapered shape in opposite directions, and the cleaning portion is gradually expanded in a direction away from the filter assembly.

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

[0014] In one embodiment, the internal cleaning brush further comprises a base portion, the base portion is protruding 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; one of the base portions is correspondingly 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.

[0015] In one embodiment, the siphon flow channel includes a side wall flow channel extending along the first direction and located on the peripheral side of the filter assembly, the side wall flow channel is provided with a plurality of the siphon holes spaced apart along the first direction, and one filter element is provided corresponding to at least one siphon hole.

[0016] In one embodiment, the siphon flow channel further comprises a bottom flow channel connecting the plurality of side wall flow channels, the bottom flow channel is provided with the first discharge port and is located on a side of the filter assembly close to the sewage discharge port.

[0017] In one embodiment, the outer frame includes a cartridge frame and a bottom cover, the cartridge frame includes a bottom plate and a side frame arranged on the bottom plate, the side wall flow channel is arranged corresponding to the side frame, and the siphon hole is arranged on the inner side of the cartridge frame; the bottom cover and the bottom plate are combined to form the bottom flow channel, and the bottom plate is provided with the first discharge port; the inner cleaning brush is arranged on the side frame.

[0018] In one embodiment, the pre-filter also includes an impeller assembly arranged in the water filter chamber, and the impeller assembly includes a mounting seat and an impeller body capable of rotating in the impeller chamber of the mounting seat; the exoskeleton is transmission-connected to the impeller body, and the mounting seat is provided with a first water inlet connected to the siphon flow channel, and a drain outlet connected to the sewage outlet.

[0019] In one embodiment, a water retaining ring is provided at the bottom of the outer frame, and a water retaining ring is provided at the mounting seat. The water retaining ring and the water retaining ring cooperate to form a water retaining channel, and the siphon flow channel and the first water inlet are connected through the water retaining channel.

[0020] In one embodiment, a plurality of second water inlets with the same circumferential opening are spaced apart on the circumferential side of the mounting seat, the impeller body includes an impeller shaft and a plurality of blades obliquely arranged on the impeller shaft, and the water flow from 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. In the impeller cavity, a cavity wall of the mounting seat away from the outer frame is provided with a limiting groove, and one end of the impeller shaft away from the outer frame is rotatably inserted into the limiting groove.

[0022] In one embodiment, the mounting seat is further provided with a ball, which is disposed at the bottom of the limiting groove and in rolling contact with the impeller shaft.

[0023] In one embodiment, the pre-filter further comprises a water distributor for generating a swirl flow, and the outer frame is further provided with a water flow driving member, and the water flow driving member can drive the outer frame to rotate under the drive of the water flow.

[0024] The present invention also provides a water use system, comprising the aforementioned pre-filter.

[0025] The technical solution of the present invention is to arrange an inner cleaning brush on the inner side of the outer frame. When the outer frame rotates with the water flow, the cleaning part of the inner cleaning brush rotates to clean the filter element, so that impurities on the filter element fall off, and the impurities are sucked into the siphon flow channel through the siphon hole, and then discharged into the sewage outlet through the first discharge port. In this way, the filter assembly can be flushed to ensure the filtering effect of the filter assembly and increase the service life of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

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

[0028] Figure 2 for Figure 1 Sectional view at AA in the middle;

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

[0030] Figure 4 for Figure 3 A partial enlarged view of point C in the middle;

[0031] Figure 5 for Figure 3 Schematic diagram of the positional relationship among the exoskeleton, filter assembly and water distributor;

[0032] Figure 6 for Figure 2 Schematic diagram of the installation relationship between the outer frame and the inner cleaning brush (the water flow drive member is not shown);

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

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

[0035] Fig. 9 for Figure 2 A front view of the inner cleaning brush;

[0036] Fig.10 for Figure 2 Schematic diagram of the positional relationship between the filter assembly and the water distributor;

[0037] Fig.11 for Fig.10 A front view of the structure shown;

[0038] Fig.12 for Fig.11 Sectional view at DD in the middle;

[0039] Fig.13 for Figure 4 Schematic diagram of the structure of the impeller assembly.

[0040] Description of Figure Numbers:

[0041] 100. Shell;

[0042] 10. filter bottle; 101. water filter chamber; 102. sewage outlet;

[0043] 20, valve head; 201, water inlet; 202, water outlet;

[0044] 30, filter assembly; 301, first connection structure; 302, second connection structure; 300, filter module; 320, filter element; 330, first water outlet; 340, water chamber; 350, second water outlet;

[0045] 40, impeller assembly; 401, impeller chamber; 402, first water inlet; 403, second water inlet; 404, drain outlet; 410, mounting seat; 411, limit groove; 424, water retaining ring; 430, ball bearing; 440, impeller body; 441, impeller shaft; 442, blades; 446, flat position;

[0046] 50, outer frame; 501, siphon flow channel; 501a, side wall flow channel; 501b, bottom flow channel; 502, water flow driving member; 503, first discharge port; 504, second discharge port; 510, drum frame; 511, chassis; 512, side frame; 515, water retaining ring; 518, snap-on groove; 520, bottom cover; 531, siphon hole; 540, water retaining plate; 541, driving surface;

[0047] 60. water distributor; 601. guide vane;

[0048] 70, inner cleaning brush; 710, cleaning portion; 720, base portion;

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

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

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[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 position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three side-by-side solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] At present, the pre-filter is the first coarse filtration device in the whole-house water purification system. It is a physical filtration device, mainly used to intercept large particles larger than 40 microns. For example, it can filter mud, rust, large particles in tap water, etc., to protect the safety of water use at the back end, thereby preventing a large amount of precipitated impurities generated in the urban and community water supply network from causing harm to the human body.

[0055] In the related art, the housing of the pre-filter usually includes a valve head and a filter bottle. The valve head is provided with a water inlet and a water outlet. The valve head and the filter bottle enclose a water filter chamber, and a filter assembly is provided in the water filter chamber. During the use of the pre-filter, it is necessary to rinse the impurities attached to the surface of the filter element in situ from time to time, and then discharge them through the drain valve. Therefore, a cylindrical exoskeleton is formed between the filter assembly and the wall of the water filter chamber. The exoskeleton guides the flow of water to ensure the filtration efficiency of water during the filtration process. At the same time, it also ensures that the flushing effect of the water filter chamber, especially the filter assembly, is improved during the flushing process.

[0056] However, on one hand, the filter assembly of the existing pre-filter is a straight-cylinder filter screen structure with a small filter area, which makes the filter efficiency of the filter assembly low.

[0057] On the other hand, during the flushing process, although the exoskeleton increases the flow convergence of water, the impact effect of the water on the components inside the water filter chamber, especially the filter assembly, is relatively low, so that impurities attached to the filter assembly cannot be thoroughly cleaned. Over time, it is easy to cause blockage of the filter assembly, thereby reducing the filtering effect.

[0058] Before introducing the technical solution of the present invention, the water filtering process of the pre-filter is first introduced. Some pre-filters on the market usually have a flushing function, that is, they can be cleaned regularly to discharge the large particles previously intercepted, thereby increasing the service life of the pre-filter. Figures 1 to 3 As shown, tap water first enters the water filter chamber 101 of the housing 100 from the water inlet 201, and is filtered by the filter assembly 30 in the water filter chamber 101; then, under the action of pressure, the filtered tap water flows out from the water outlet 202 to the water-using end (water-using equipment). After a period of use, a certain amount of impurities are inevitably deposited in the filter assembly 30 and the water filter chamber 101. At this time, the water outlet 202 can be closed, the sewage outlet 102 of the housing 100 can be opened, and the tap water coming in from the water inlet 201 can be guided to flush the filter assembly 30, the outer frame 50 and the water filter chamber 101 to improve the filtering capacity of the filter assembly 30.

[0059] The invention provides a pre-filter.

[0060] See also Figures 1 to 4 , Figure 8 , Fig.11 and Fig.12 In one embodiment of the present invention, the pre-filter comprises:

[0061] The housing 100 has a water filter chamber 101, and a water inlet 201, a water outlet 202 and a sewage outlet 102 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 use end;

[0062] The filter assembly 30 is disposed in the water filter chamber 101. The filter assembly 30 includes a plurality of filter modules 300 distributed along a first direction. The filter module 300 is provided with a water passage chamber 340, a first water passage port 330 and a second water passage port 350. The first water passage port 330 and the second water passage port 350 are connected to the water filter chamber 101. The second water passage port 350 is provided with a filter element 320; and

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

[0064] The technical solution of the present invention is to set a siphon channel 501 and a siphon hole 531 on the outer frame 50. When the impurities and particles intercepted by the filter assembly 30 are impacted by the water flow and fall off, they can be sucked into the siphon hole 531 and the siphon channel 501 by the siphon effect and discharged more efficiently. That is, the impurities and particles intercepted by the filter assembly 30 can be more effectively guided to the sewage outlet 102 during the flushing stage, and finally discharged through the sewage outlet 102, thereby improving the flushing effect of the water filter cavity 101, especially the filter assembly 30.

[0065] It can be understood that the scenarios in which the pre-filter of the present invention can be applied include but are not limited to water use systems. For example, a whole-house water purification system is usually equipped with a pre-filter, and the pre-filter is used to filter large particles in tap water, which can not only ensure the safety of residents' water use, but also extend the service life of home appliances, prevent household water pipes from being blocked, and improve the health level of residents.

[0066] It should be noted that the water supply end may be a water pipe, a water tower or a well water, and the water use end may be a faucet, a shower or a drinking water outlet, and this application does not make specific restrictions on this. The form and structure of the filter element 320 are not limited, for example, it may be a stainless steel filter mesh or a PP cotton filter mesh.

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

[0068] See also Figures 1 to 3 Optionally, the housing 100 includes a valve head 20, a filter bottle 10 and a sewage discharge assembly 80, the water inlet 201 and the water outlet 202 are formed on the valve head 20, the sewage discharge assembly 80 is installed on the side of the filter bottle 10 away from the valve head 20, the sewage discharge assembly 80 is formed with a sewage discharge channel, and the sewage discharge port 102 is located on the side of the sewage discharge channel away from the valve head 20. In this way, the structure is simple and easy to implement. Among them, the sewage discharge assembly 80 may include a sewage discharge valve 820, and the sewage discharge channel is interrupted or connected through the sewage discharge valve 820.

[0069] See also Figure 4 Optionally, the siphon hole 531 is arranged side by side with the filter element 320 in the first direction. In this way, the siphon hole 531 can be arranged as close to the filter element 320 as possible, so as to promptly absorb the impurities falling off the filter element 320 during the flushing stage. Of course, in other embodiments, the siphon hole 531 can also be arranged in a staggered manner with the filter element 320 in the first direction.

[0070] See also Figure 4 and Fig.12Optionally, the filter element 320 is at least partially tilted. In this way, by tilting the filter element 320 at least partially, the filter area of ​​the filter element 320 is increased relative to the cylindrical structure of the filter element 320 extending in the axial direction. Under the condition of the same axial height, the filter area of ​​the filter element 320 can be increased. Due to the increase in the filter area of ​​the filter element 320, it can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filter area of ​​the filter element 320 is large enough, even if a local area of ​​the filter element 320 is clogged, the remaining area of ​​the filter element 320 can continue to withstand a larger flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0071] Secondly, the filter assembly 30 of the present solution includes multiple filter modules 300. Since the filter area on each filter module 300 is constant, the present solution can increase the total filter area of ​​the filter assembly 30 by setting multiple filter modules 300, thereby improving the filter 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 filter area.

[0072] See also Figure 4 and Fig.12 Optionally, the filter element 320 is arranged in an annular shape, and the axis extends along the first direction. The filter element 320 has an inner ring edge and an outer ring edge, and the outer ring edge is located on the axial side of the inner ring edge, and 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 skeleton 50 than the inner ring edge, and the filter element 320 is in a structural form that extends obliquely from the inner ring edge toward the outer ring edge, so that impurities falling off the filter element 320 can flow along the outer surface of the filter element 320 to the outer ring edge and be sucked into the siphon hole 531 adjacent to the outer ring edge. In this way, the siphon effect and its efficiency can be improved. Of course, in other embodiments, the siphon hole 531 can also be arranged side by side with the inner ring edge in the first direction, or the siphon hole 531 can be between the inner ring edge and the outer ring edge in the first direction.

[0073] See also Fig.12, optionally, the same filter module 300 has two opposite filter elements 320 in the first direction, and the two filter elements 320 are arranged in a tapered shape in the direction away from each other, and the siphon hole 531 is arranged corresponding to at least one of the two filter elements 320. In this way, the two filter elements 320 of the same filter module 300 are arranged in a tapered shape in the direction away from each other, so that a bell-shaped space with an opening facing outward is formed between the two adjacent filter elements 320 of the two adjacent filter modules 300, and the bell-shaped space is conducive to the impurities falling off the filter element 320 to flow to the siphon hole 531. In this embodiment, optionally, the two filter elements 320 on the same filter module 300 are each provided with a siphon hole 531, so that the impurities falling off each filter element 320 can be specifically sucked away by the 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 can also be provided with only one siphon hole 531.

[0074] See also Fig.12 Optionally, a first connection structure 301 and a second connection structure 302 are respectively provided on both sides of the filter module 300 distributed along the first direction, and the first connection structure 301 of a filter module 300 is used to be detachably connected to the second connection structure 302 of another filter module 300 to fix the two filter modules 300.

[0075] The technical solution of the present invention is to respectively set 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 with each other. In this way, the number of filter modules 300 can be flexibly adjusted according to the model of the pre-filter (for example but not limited to the size of the filter bottle 10), so as to achieve the effect of adjusting the size of the filter component 30, thereby solving the problem of sharing the filter components 30 of pre-filters of different models. Since the filtration area on each filter module 300 is fixed, by adjusting the number of filter modules 300, the total filtration area of ​​the filter component 30 can also be adjusted, so that a suitable filtration area can be set, thereby achieving the effect of improving the filtration effect.

[0076] Secondly, since the first connecting structure 301 and the second connecting structure 302 are respectively provided on both sides of each filter module 300, the user can pick up two filter modules 300 at will and connect and fix them, which can avoid the user from searching for a suitable filter module 300 to be installed, thereby improving the installation efficiency of the filter assembly 30.

[0077] Further, the first connection structure 301 of a filter module 300 is used to be detachably connected with the second connection structure 302 of another filter module 300. It can be understood that the detachable connection allows the parts to be easily separated without damaging the connector itself or adjacent parts. This feature allows the filter assembly 30 to be operated quickly and effectively when the filter module 300 needs to be repaired or replaced, reducing the difficulty and cost of maintenance. Since the detachable connection is easy to operate, it can greatly save time when the filter assembly 30 maintains and replaces the filter module 300. Moreover, the detachable connection allows the faulty filter module 300 to be quickly replaced, thereby reducing the time of water outage of the water system and improving the maintenance efficiency. Secondly, compared with the non-detachable connection, the detachable connection reduces the situation of the overall scrapping of the parts due to the inability to disassemble, and reduces the waste of resources. Furthermore, the detachable connection allows the filter assembly 30 to be inspected and maintained regularly or irregularly to ensure its stability and safety, which helps to timely discover and solve potential safety hazards.

[0078] See also Fig.12 In one embodiment, the first connection structure 301 of a filter module 300 is used to snap-fit ​​with the second connection structure 302 of another filter module 300; it can be understood that the snap-fit ​​method does not require additional locking accessories, such as screws, nuts, etc., during assembly, thereby reducing the manufacturing cost and assembly cost of the filter component 30. Moreover, due to the flexible snap-fit ​​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-fit ​​can achieve rapid assembly and disassembly without the need for complex tools and equipment. This greatly improves production efficiency and assembly efficiency, and also facilitates the maintenance and replacement of the filter module 300. Furthermore, the operation process of the snap-fit ​​is simple and clear, and easy to master. Whether it is a worker on the production line or an ordinary consumer, the assembly and disassembly work can be easily completed.

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

[0080] See also Figure 4 , Figure 6 and Figure 8Optionally, the siphon channel 501 includes a side wall channel 501a extending along the first direction and located on the outside of the filter assembly 30, and the side wall channel 501a is provided with a plurality of siphon holes 531 at intervals along the first direction, and one filter element 320 is provided corresponding to at least one siphon hole 531. In this way, during the flushing stage, the particles detached from each filter element 320 can be guided and discharged by at least one siphon hole 531, which can further improve the flushing effect. Of course, in other embodiments, a siphon hole 531 can also be provided corresponding to multiple filter elements 320, for example, a siphon hole 531 is provided between two adjacent filter elements 320 to correspond to the siphon effect of the two filter elements 320.

[0081] See also Figure 8 In order to further improve the flushing efficiency and effect, optionally, at least two side wall flow channels 501a are provided, and at least two side wall flow channels 501a are spaced apart on opposite sides of the filter assembly 30. In this way, the multiple siphon holes 531 on the multiple side wall flow channels 501a work simultaneously and play a more efficient siphoning role on the filter element 320. In this embodiment, optionally, two side wall flow channels 501a are provided. Of course, in other embodiments, three or more side wall flow channels 501a may also be provided, or only one side wall flow channel 501a may be provided.

[0082] See also Figure 8 Furthermore, the siphon flow channel 501 further includes a bottom flow channel 501b connecting the multiple side wall flow channels 501a, and the bottom flow channel 501b is provided with a first discharge port 503 and is located on the side of the filter assembly 30 close to the sewage outlet 102. In this way, the water flows in the multiple side wall flow channels 501a are collected together through the bottom flow 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 flow channel 501b may not be provided, and the first discharge port 503 may be directly formed at the lower end of the side wall flow channel 501a.

[0083] Please refer to the figure Figure 6 and Figure 8Further, the outer frame 50 includes a cartridge frame 510 and a bottom cover 520. The cartridge frame 510 includes a bottom plate 511 and a side frame 512 disposed on the bottom plate 511. The side wall flow channel 501a is disposed corresponding to the side frame 512. The siphon hole 531 is disposed on the inner side of the cartridge frame 510. The bottom cover 520 and the bottom plate 511 are covered to form a bottom flow channel 501b. The bottom plate 511 is provided with a first discharge port 503. By designing the bottom flow channel 501b between the bottom plate 511 and the bottom cover 520, compared with the bottom flow channel 501b being disposed through the inside of the bottom plate 511, on the one hand, the structure is simple and the manufacturing is convenient; on the other hand, the cleaning is convenient, and the possibility of dirt accumulating inside and clogging the filter element 320 is reduced, thereby avoiding siphon failure; and compared with the existing solution, it is easier to increase the size of the siphon flow channel 501 and improve the cleaning effect.

[0084] See also Figure 4 The siphon flow channel 501 is in an "L" shape, the side wall flow channel 501a is the vertical part of the "L" shape, and the bottom flow channel 501b is the horizontal part of the "L" shape. The side wall flow channel 501a is arranged corresponding to the side frame 512, which means that the side wall flow channel 501a is arranged on the side frame 512 part, and does not limit the formation method of the side wall flow channel 501a.

[0085] See also Figure 8 Further, in order to enhance the drainage efficiency, the chassis 511 is also provided with a second discharge port 504, and the second discharge port 504 is connected to the inner side of the cartridge rack 510 and the outer side of the cartridge rack 510. The addition of the second discharge port 504 provides an additional discharge channel for the accumulated water inside the cartridge rack 510, which helps to speed up the water flow and improve the drainage efficiency. During the use of the filter, especially under high flow or high pressure conditions, this design can significantly reduce the risk of water accumulation inside the cartridge rack 510 and ensure the smooth operation of the filter. By discharging the accumulated water inside the cartridge rack 510 in a timely manner, the residence time of the water between the filter assembly 30 and the cartridge rack 510 can be reduced, which helps to improve the overall filtering effect of the pre-filter.

[0086] According to the water accumulation inside the drum rack 510 and the drainage demand, a plurality of second discharge ports 504 can be provided on the chassis 511. These second discharge ports 504 can be evenly distributed or arranged in a targeted manner according to the water accumulation area to maximize the drainage efficiency. Specifically, a plurality of second discharge ports 504 are provided, and the second discharge ports 504 are arranged between two adjacent siphon channels 501 and close to the outside of the chassis 511 relative to the first discharge port 503. The second discharge port 504 is arranged at a position symmetrical to the first discharge port 503 to maintain the balance and beauty of the overall structure. This arrangement also helps to disperse the drainage pressure and improve the drainage efficiency.

[0087] See also Figure 8Optionally, in this embodiment, three siphon channels 501 are designed on the outer frame 50, and the three siphon channels 501 are evenly distributed at 120 degrees. Seven siphon holes 531 are designed on the wall of the siphon member, and the shape of the siphon holes 531 is elliptical. The number and layout of the siphon holes 531 are related to the number and structure of the modules of the filter assembly 30, and can be flexibly arranged.

[0088] The bottom plate 511 and the side frame 512 may be integrally formed, or the side frame 512 may be fixed to the bottom plate 511 by screws or the like. The bottom plate 511 of the cartridge holder 510 is circular, and the side frame 512 surrounds the bottom plate 511 and is designed around the outer edge of the filter assembly 30. The side frame 512 is generally a part of a ring or cylinder, but is not completely closed to allow water to flow through. The shape of the side frame 512 matches the shape of the filter assembly 30, ensuring that it can fit tightly and support the filter assembly 30, while maintaining effective circulation of water around the filter assembly 30.

[0089] See also Figure 4 , Figure 5 and Figure 8 Optionally, the bottom cover 520 and the bottom plate 511 are covered to form the bottom flow channel 501b. In one embodiment, the bottom flow channel 501b is provided on the bottom cover 520. To facilitate disassembly, the bottom cover 520 and the bottom plate 511 are detachably connected, such as by screw locking or snap connection. Due to the detachable design of the bottom cover 520, cleaning and maintenance become simple and convenient. Users can complete these tasks by themselves without having to invite professionals to provide door-to-door service, thereby reducing maintenance costs.

[0090] In one embodiment, the exoskeleton 50 is rotatably mounted on the outside of the filter component 30, and the exoskeleton 50 or the filter component 30 is provided with an electric / manually driven cleaning mechanism, which 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, particulate matter, etc. intercepted by the filter component 30 can be more effectively guided to the bottom flow channel 501b, and finally discharged through the drain port 102.

[0091] See also Figure 2 , Figure 6 and Fig. 9In a further solution, the cleaning mechanism includes an inner cleaning brush 70 disposed on the inner side of the outer frame 50, and the inner cleaning brush 70 is provided with a cleaning portion 710, and the cleaning portion 710 is used to clean the outer surface of the filter element 320. When the outer frame 50 rotates with the water flow, the cleaning portion 710 rotates to clean the filter element 320, so that impurities on the filter element 320 fall off, and the impurities are sucked into the siphon flow channel 501 through the siphon hole 531, and then discharged into the sewage outlet 102 through the first discharge port 503. In this way, the present application can improve the flushing effect of the pre-filter on the filter assembly 30 during the flushing stage.

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

[0093] See also Figure 2 , Fig. 9 and Fig.12 Optionally, the filter element 320 is arranged in an annular shape, and the axis extends along the first direction. The filter element 320 has an inner annular edge and an outer annular edge, and the outer annular edge is located on the axial side of the inner annular edge. The cleaning portion 710 is arranged side by side with the filter element 320 in the first direction. In this way, the structure can be made more compact, and the problem of the length of the suspended portion of the inner cleaning brush 70 being too long can be avoided, so as to improve the structural stability and reliability of the inner cleaning brush 70. Of course, in other embodiments, the cleaning portion 710 can also be arranged in a staggered manner with the filter element 320 in the first direction.

[0094] See also Figure 2 , Figure 3 and Figure 6 Optionally, the siphon hole 531 is arranged side by side with the filter element 320 in the first direction, and the siphon channel 501 and the inner cleaning brush 70 are spaced apart along the circumference of the outer skeleton 50. Specifically, in the process of the outer skeleton 50 driving the inner cleaning brush 70 to rotate to scrub the outer surface of the filter element 320, the inner cleaning brush 70 and the siphon channel 501 are equivalent to having an upstream and downstream relationship along the circumferential direction, so that after the impurities on the filter element 320 are scrubbed by the inner cleaning brush 70 and fall off, they can be sucked away by the siphon hole 531 on the siphon channel 501 that follows, thereby improving the flushing effect and efficiency. Of course, in other embodiments, the inner cleaning brush 70 and the siphon channel 501 can also be arranged at the same position along the circumferential direction of the outer skeleton 50.

[0095] See also Figure 6Optionally, the siphon channel 501 includes at least two side wall channels 501a extending along the first direction and located outside the filter assembly 30, the side wall channels 501a are provided with siphon holes 531, at least two internal cleaning brushes 70 are provided, and the internal cleaning brushes 70 and the side wall channels 501a are alternately distributed along the circumferential direction. In this way, the scrubbing and siphoning efficiency and effect in the flushing stage can be improved. Of course, in other embodiments, only one siphon channel 501 and one internal cleaning brush 70 may be provided.

[0096] See also Figure 2 , Fig. 9 and Fig.12 Optionally, the same filter module 300 has two opposite filter elements 320 in the first direction, and the two filter elements 320 are arranged in a tapered shape in the directions away from each other, and the cleaning portion 710 is gradually expanded in the direction away from the filter assembly 30. In this way, the two filter elements 320 of the same filter module 300 are tapered in the directions away from each other, so that a bell-mouth space with an opening facing outward is formed between the two adjacent filter elements 320 of the two adjacent filter modules 300, and the bell-mouth space is conducive to the impurities falling off the filter element 320 to flow to the siphon hole 531. Secondly, the two opposite sides of the cleaning portion 710 in the first direction can more comprehensively scrub the outer surface of the filter element 320. Of course, in other embodiments, the two filter elements 320 can also be arranged in a gradually expanded shape in the directions away from each other.

[0097] It should be noted that Fig. 9 The axonometric view and the front view of the inner cleaning brush 70 are also shown, wherein the axonometric view is located at Fig. 9 , while the main view is located in Fig. 9 It can be seen from the front view of the inner cleaning brush 70 that the height dimension of the cleaning portion 710 in the first direction gradually increases in the direction away from the filter assembly 30, so that it can be adapted to abut against the two filter elements 320 located in the bell mouth space.

[0098] Optionally, at least one inner cleaning brush 70 is provided with cleaning parts 710 on opposite sides in the first direction, and the two cleaning parts 710 respectively clean two adjacent filter elements 320 of two adjacent filter modules 300. That is, the inner cleaning brush 70 is correspondingly arranged at the connection of two adjacent filter modules 300, and can simultaneously clean the two filter elements 320 facing each other of the two adjacent filter modules 300. In this way, the brushing efficiency and effect can be improved. Of course, in other embodiments, one inner cleaning brush 70 can also be provided with only one cleaning part 710.

[0099] See also Fig. 9Optionally, the inner cleaning brush 70 further includes a base portion 720, the base portion 720 is convexly arranged on the inner peripheral side of the outer frame 50, and the cleaning portion 710 is connected to the outer peripheral side of the base portion 720; one base portion 720 is correspondingly provided with two cleaning portions 710 extending in opposite directions in the first direction, and the side of the cleaning portion 710 away from the base portion 720 is interference-set with the outer surface of the filter element 320. In this way, the cleaning portion 710 can have a certain friction force on the filter element 320, thereby improving the brushing effect, and the relative movement of the cleaning portion 710 and the filter element 320 is not affected.

[0100] See also Fig. 9 In this embodiment, the internal cleaning brush 70 has two types of structures. For the internal cleaning brush 70 provided at the connection between the two filter modules 300, two cleaning parts 710 extending in opposite directions in the axial direction of the outer frame 50 are provided on a base part 720. For the internal cleaning brush 70 provided at the end of the filter assembly 30, only one cleaning part 710 is required to be provided on the base part 720. The structure of the internal cleaning brush 70 can be the structure of the aforementioned internal cleaning brush 70 divided in half. Without loss of generality, in the former type of internal cleaning brush 70, the base part 720 can be cylindrical, and the two cleaning parts 710 are distributed on both sides of the axis of the cylinder. In the latter type of internal cleaning brush 70, the base part 720 is configured as a half-cylinder, and the cleaning parts 710 are connected to the circumference of the cylinder.

[0101] In one embodiment, the outer frame 50 can rotate relative to the filter assembly 30. For example, see Figure 3 , Figure 5 , Figure 7 and Fig.10 The pre-filter further includes a water distributor 60 for generating a swirl flow, and the outer frame 50 is further provided with a water flow driving member 502, which can drive the outer frame 50 to rotate under the drive of the 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 in the filter bottle 10 generates a swirl flow, which can not only improve the effect of the water flow flushing the filter element 320, but also enable the sewage to be discharged from the sewage outlet 102 faster.

[0102] Of course, in other embodiments, the outer frame 50 may also be rotated relative to the filter assembly 30 through an electric drive rotation or a manual drive rotation structure.

[0103] See also Figure 7 and Fig.10Optionally, the water distributor 60 is arranged closer to the water inlet 201 than the water flow driving member 502, and the water distributor 60 has a plurality of guide blades 601 distributed in the circumferential direction and inclined relative to the axial direction; the outer frame 50 is provided with a plurality of water flow driving members 502, and the plurality of water flow driving members 502 are distributed at intervals along the circumference of the outer frame 50. The water flow driving member 502 has a plurality of water baffles 540 distributed at intervals along the circumference of the side frame 512, and the water baffles 540 have a driving surface 541 extending along the first direction.

[0104] It can be understood that the water distributor 60 is located between the water flow driving member 502 and the water inlet 201, and the water flow from the water inlet 201 needs to pass through the water distributor 60 before flowing to the water flow driving member 502, and the water distributor 60 has a plurality of guide blades 601 distributed circumferentially around the filter assembly 30, the guide blades 601 extend obliquely relative to the axial direction of the filter assembly 30, and a flow channel inclined relative to the axial direction is formed between two adjacent guide blades 601, and there are a plurality of such flow channels in the circumferential direction of the filter assembly 30. In addition, the inclination direction of the guide blades 601 is opposite to or obliquely opposite to the driving surface 541. In this way, under the drainage effect of the guide blades 601, the flow direction of the water flow flowing through the above-mentioned flow channel can impact the driving surface 541 vertically or nearly vertically, which not only ensures the size of the driving force driving the external skeleton 50 to rotate, but also enables the external skeleton 50 to rotate stably. Furthermore, while ensuring that the driving surface 541 can drive the outer frame 50 to rotate in the circumferential direction of the side frame 512, the inclination of the driving 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 close to the water inlet 201, the water flow can fully cover the water distributor 60, so that any guide blade 601 can adjust the flow direction of the water flow, and the water distributor 60 is fixedly connected relative to the shell 100. Correspondingly, there is a gap between the water distributor 60 and the water flow driving member 502 to ensure that the water flow guided by the guide blade 601 can impact the corresponding driving surface 541, and the water flow driving member 502 and the side frame 512 can rotate relative to the shell 100 in the water filter chamber 101. Specifically, the water distributor 60 allows the water flow to flow in a circumferential vortex along the axial direction of the filter assembly 30, and the driving surface 541 extends along the axial direction (i.e., the first direction) of the filter assembly 30, thereby generating a maximized circumferential driving force on the exoskeleton 50, thereby improving the rotation rate of the exoskeleton 50 and the effect of the internal cleaning brush 70 in cleaning the filter assembly 30.

[0106] See also Figure 4 and Fig.13Furthermore, the pre-filter also includes an impeller assembly 40 arranged in the water filter chamber 101, and the impeller assembly 40 includes a mounting seat 410 and an impeller body 440 that can rotate in the impeller chamber 401 arranged on the mounting seat 410; the mounting seat 410 is provided with a first water inlet 402 connected to the siphon flow channel 501, and a drain outlet 404 connected to the sewage outlet 102.

[0107] During the flushing stage of the pre-filter, that is, when the drain valve 820 is opened, water flows into the first water inlet 402 of the impeller assembly 40, and the impeller body 440 rotates under the impact of the water flow. This rotational motion can generate a vortex effect, so that the water flow forms a stronger agitation inside the filter bottle 10, thereby more effectively removing impurities and dirt attached to the surface of the filter medium. Compared with static 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 stir up the impurities and dirt inside the filter bottle 10, suspending them in the water, and discharge the filter bottle 10 with the water flow through the drain valve 820 and the drain port 102, avoiding the re-deposition of impurities on the filter medium, and ensuring the thoroughness of the flushing process. In addition, the impeller assembly 40 can effectively prevent the clogging of the filter medium, keep the water flow unobstructed, and maintain the filtering efficiency of the pre-filter by enhancing the flushing effect. This is crucial to maintaining stable water pressure and clean water quality in home or commercial systems.

[0108] In addition, the impeller assembly 40 is arranged upstream of the sewage outlet 102. The impeller assembly 40 generates centrifugal force through rotation, which can cause the water flowing out of the sewage outlet 102 to generate a vortex, 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 the present invention can be used alone in a conventional pre-filter. Conventional pre-filters mostly adopt a simple drain valve 820 design. By opening the drain valve 820, water is allowed to flush the surface of the filter assembly 30 to discharge some impurities. However, this method often has low drainage efficiency and is difficult to completely remove stubborn dirt inside the filter assembly 30, especially for small particles and adhesive impurities. The removal effect is not ideal. By setting the impeller assembly 40 in the drainage system and using the water flow power to drive the impeller body 440 to rotate, it can not only enhance the flushing force and stirring effect of the water flow, but also improve the drainage efficiency and cleanliness. At the same time, the design of the impeller assembly 40 can be relatively simple, low cost, and no additional energy consumption is required, which helps to reduce overall operating costs and reduce water resource waste.

[0110] Furthermore, the exoskeleton 50 is transmission-connected to the impeller body 440, so that the impeller body 440 can rotate in the same direction as the exoskeleton 50 during the flushing stage and provide additional rotational driving force to the exoskeleton 50. That is, the water distributor 60 cooperates with the water flow driving component 502 to provide a rotational driving force to the exoskeleton 50, and the impeller body 440 itself rotates due to the impact of the water flow and links with the exoskeleton 50, and can also provide a rotational driving force to the exoskeleton 50, and these two rotational driving forces are arranged in the same direction.

[0111] Optionally, the outer frame 50 is combined with the inner cleaning brush 70, and the inner cleaning brush 70 is driven by the rotation of the outer frame 50 and the impeller body 440 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 many structural forms for realizing the transmission connection between the outer frame 50 and the impeller body 440, for example, see Figure 4 and Fig.13 In one embodiment, a snap-in groove 518 is recessed on one side of the outer frame 50 facing the mounting seat 410, and the impeller body 440 includes an impeller shaft 441, and at least one flat position 446 is circumferentially arranged on the impeller shaft 441. The impeller shaft 441 is inserted into the snap-in groove 518, and the flat position 446 is adapted to abut against the side groove wall of the snap-in groove 518.

[0113] It can be understood that the clamping groove 518 and the end of the impeller shaft 441 are adapted to be inserted or interference fit, and a flat portion 446 is provided between the clamping groove 518 and the impeller shaft 441 in the circumferential direction of the clamping groove 518. 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 clamping groove 518 have an axially inserted portion, which improves the efficiency of power transmission.

[0114] Of course, in other embodiments, the outer frame 50 may have a plurality of first protrusions distributed along the circumference on one side of the mounting seat 410, and the impeller shaft 441 may have a plurality of second protrusions provided at one end close to the outer frame 50, and the plurality of second protrusions may be distributed along the circumference of the impeller shaft 441, with a first protrusion being clamped between two adjacent second protrusions.

[0115] See also 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 oblique angle near the center position. The first discharge port 503 set at an oblique angle can make the water flow obliquely enter the impeller chamber 401, thereby improving the rotation efficiency of the impeller body 440.

[0116] See also Fig.13Optionally, multiple second water inlets 403 with the same circumferential opening are provided at intervals on the circumferential side of the mounting seat 410, and the impeller body 440 includes an impeller shaft 441 and multiple blades 442 obliquely arranged on the impeller shaft 441. The water flows from the first water inlet 402 and the second water inlet 403 can both cause the blades 442 to drive the impeller shaft 441 to rotate. In this way, the water flow path and flow rate entering the impeller chamber 401 are increased through the first water inlet 402 and the second water inlet 403. The multiple water inlets can form a more complex flow pattern in the impeller chamber 401, providing sufficient power for the rotation of the impeller body 440.

[0117] See also Figure 4 and Fig.13 Specifically, optionally, the impeller body 440 includes an impeller shaft 441 and a plurality of inclined blades 442, one side of the blade 442 is bent into an arc surface, a portion of the arc surface faces the first water inlet 402, and the other portion faces the second water inlet 403, so that the blade 442 can be acted upon by the water flow of the second side water inlet 403 and the first top water inlet 402 and drive the impeller shaft 441 to rotate.

[0118] The impeller chamber 401 is located inside the mounting seat 410 as a closed space for the impeller body 440 to rotate. After the water flows from the filter bottle 10 through the filter assembly 30, part of the water flow (i.e., the sewage to be discharged) enters the impeller chamber 401 through the first water inlet 402 and the second water inlet 403, interacts with the rotating impeller body 440, generates a rotating force and a stirring effect, and helps to flush out the impurities remaining in the filter assembly 30. When the water flows into the impeller chamber 401, it will impact the impeller body 440 and drive it to rotate. The rotating impeller body 440 not only enhances the rotating force and stirring effect of the water flow, but also guides the water flow to the sewage outlet 102 through its specific blade 442 design, thereby improving the sewage discharge efficiency and cleanliness. The drain outlet 404 is arranged at the bottom or side of the mounting seat 410 (usually connected to the sewage valve 820), and its main function is to discharge the wastewater treated by the impeller assembly 40 out of the pre-filter.

[0119] There are many structural forms for realizing the rotation connection of the impeller shaft 441, for example, see Figure 4In one embodiment, the impeller body 440 includes an impeller shaft 441. In the impeller cavity 401, a cavity wall of the mounting seat 410 away from the outer frame 50 is recessed with a limiting groove 411, and one end of the impeller shaft 441 away from the outer frame 50 is rotatably inserted in the limiting groove 411. In this way, the 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 avoidance port, and the end of the impeller shaft 441 can be axially rotatably inserted in the limiting groove 411, wherein the limiting groove 411 cooperates with the clamping groove 518 to limit the two ends of the impeller shaft 441 respectively, thereby avoiding eccentricity in the rotation of the impeller body 440 and ensuring the stability of the impeller body 440 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 appears as a convex column protruding from the end of the impeller shaft 441. In this way, the impeller shaft 441 has a step surface on the side of the cavity wall where the limiting groove 411 is located, which abuts against the cavity wall. It not only has good stability in circumferential rotation, but also can limit the impeller body 440 in the axial direction to avoid axial vibration of the impeller body 440.

[0120] Please refer to Figure 4 , further, the mounting seat 410 is also provided with a ball 430, which is arranged at the bottom of the limiting groove 411 and rolls against the impeller shaft 441. It should be noted that the ball 430 can rotate and roll freely in the limiting groove 411. During the rotation of the impeller body 440, rolling friction occurs between the ball 430 and the impeller shaft 441, which reduces the friction force on the impeller shaft 441, thereby improving the smoothness and rotation efficiency of the impeller body 440. At the same time, the setting of the ball 430 also reduces the length of the protrusion of the impeller shaft 441 inserted in the limiting groove 411, improves the bending resistance of the protrusion, ensures the water flow impact force that the impeller shaft 441 can withstand, thereby improving the rotation stability of the impeller body 440. Of course, in other embodiments, the ball 430 may not be provided, and the surface abutted by the impeller shaft 441 and the limiting groove 411 may also be set to be relatively smooth, so as to provide rotation support by sliding friction.

[0121] See also Figure 4 and Fig.13, a water retaining ring 515 is provided at the bottom of the outer frame 50, and a water retaining ring 424 is provided at the mounting seat 410. The water retaining ring 515 and the water retaining ring 424 cooperate to form a water retaining channel, and the siphon flow channel 501 and the first water inlet 402 are connected through the water retaining channel. Specifically, the mounting seat 410 is provided with second water inlets 403 on both opposite sides, and the water in the filter bottle 10 other than the siphon flow channel 501 can enter from these two second water inlets 403 when draining. Four oblique first water inlets 402 are designed on the upper side of the mounting seat 410, and the water flowing out of the siphon flow channel 501 enters the impeller chamber 401 through the first water inlet 402. A water retaining ring 424 is designed on the upper part of the mounting seat 410, which cooperates with the water retaining ring 424 of the outer frame 50 to prevent excessive water from the outside from flowing into the first water inlet 402 on the upper part of the mounting seat 410.

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

[0123] Specifically, in the filtering mode, the water outlet 202 is in an open state and the drain valve 820 is in a closed state, and the water from the water supply end flows into the shell 100 from the water inlet 201, and then flows to the water flow driving component 502 and the water filter chamber 101 through the water distributor 60. At this time, the water flow driving component 502 rotates due to the impact of the water flow from the water distributor 60, and drives the outer skeleton 50 to rotate, causing the water in the water filter chamber 101 to produce a swirling motion. The water in the water filter chamber 101 will be filtered by the filter element 320 in the process of flowing into the water chamber 340 through the second water outlet 350, that is, the water flowing into the water chamber 340 is clean water, and the clean water can flow along the first direction toward the valve head 20 (the two 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 water outlet 202 of the valve head 20, and finally flow out from the water outlet 202 to the water use end.

[0124] It can be seen that in the filtering mode, the approximate flow direction of water entering the shell 100 is: first flowing along the axial direction of the filter assembly 30 toward the direction away from the valve head 20, then flowing along the radial direction of the filter assembly 30 from the periphery of the filter assembly 30 toward the center of the filter assembly 30, and then flowing along the axial direction of the filter assembly 30 toward the direction close to the valve head 20.

[0125] In the flushing mode, the water outlet 202 is in a closed state and the drain valve 820 is in an open state. The water from the water supply end flows into the housing 100 from the water inlet 201, and then flows to the water flow driving member 502 and the water filter chamber 101 through the water distributor 60. At this time, the water flow driving member 502 is impacted by the water flow from the water distributor 60 and rotates, and drives the outer frame 50 to rotate to cause the water in the water filter chamber 101 to produce a swirl motion. The swirling water can wash the outer surface of the filter element 320. At the same time, the internal cleaning brush 70 rotates with the outer frame 50 to brush the outer surface of the filter element 320. The water in the water filter chamber 101 carries the impurities that fall off from the filter element 320. A part of the water flows into the siphon channel 501 from the siphon hole 531 and flows to the first discharge port 503, and the other part directly flows to the second discharge port 504 located at the bottom of the outer frame 50. The water flowing out from the first discharge port 503 and the second discharge port 504 flows into the impeller chamber 401 and drives the impeller body 440 to rotate, then flows from the drain port 404 at the bottom of the impeller chamber 401 to the sewage outlet 102, and finally flows out from the sewage outlet 102 to the outside.

[0126] It can be seen that in the flushing mode, the approximate flow direction of the water entering the shell 100 is: first, it flows along the axial direction of the filter assembly 30 in the direction away from the valve head 20, and then a part of it flows along the radial direction of the exoskeleton 50 from the inner side of the exoskeleton 50 to the siphon channel 501, and flows through the siphon channel 501 to the first discharge port 503, and the other part flows directly to the second discharge port 504; then, it further flows into the impeller assembly 40 in the direction away from the valve head 20, and finally flows to the sewage outlet 102.

[0127] The present invention also proposes a water use system, which includes a pre-filter. The specific structure of the pre-filter refers to the above-mentioned embodiment. Since the water use system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0128] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The housing has a water filter cavity, and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity, wherein the water inlet is connected to the water supply end, and the water outlet is connected to the water use end; A filter assembly is arranged in the water filter cavity and comprises a plurality of filter modules distributed along a first direction, wherein the filter module is provided with a water passage cavity, a first water passage port and a second water passage port, wherein the first water passage port and the second water passage port are connected to the water filter cavity, and the second water passage port is provided with a filter element; as well as An outer frame is rotatably sleeved on the outer side of the filter assembly and is provided with a siphon flow channel, a siphon hole and a first discharge port respectively connected to the siphon flow channel, the siphon hole is arranged corresponding to the filter element, and the first discharge port is 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, and the cleaning part is used to clean the outer surface of the filter element.

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

3. The pre-filter according to claim 2, characterized in that: The siphon hole is arranged side by side with the filter element in the first direction, and the siphon flow channel and the inner cleaning brush are distributed at intervals along the circumference of the outer skeleton.

4. The pre-filter according to claim 2, characterized in that: The siphon flow channel includes at least two side wall flow channels extending along the first direction and located outside the filter assembly, the side wall flow channel is provided with the siphon hole, at least two internal cleaning brushes are provided, and the internal cleaning brushes and the side wall flow channels are alternately distributed along the circumferential direction.

5. The pre-filter according to claim 2, characterized in that: The same filter module has two opposite filter elements in the first direction, and the two filter elements are arranged in a tapered shape in opposite directions, and the cleaning portion is gradually expanded in a direction away from the filter assembly.

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

7. The pre-filter according to claim 5, characterized in that: The inner cleaning brush also includes a base portion, which is protruding from the inner circumference of the outer skeleton, and the cleaning portion is connected to the outer circumference of the base portion; one base portion is correspondingly 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-set with the outer surface of the filter element.

8. The pre-filter according to claim 1, characterized in that: The siphon flow channel includes a side wall flow channel extending along the first direction and located on the peripheral side of the filter assembly. The side wall flow channel is provided with a plurality of siphon holes spaced apart along the first direction, and one filter element is provided corresponding to at least one siphon hole.

9. The pre-filter according to claim 8, characterized in that: The siphon flow channel also includes a bottom flow channel connected to the plurality of side wall flow channels. The bottom flow channel is provided with the first discharge port and is located on a side of the filter assembly close to the sewage discharge port.

10. The pre-filter according to claim 9, characterized in that: The outer frame includes a cartridge frame and a bottom cover, the cartridge frame includes a bottom plate and a side frame arranged on the bottom plate, the side wall flow channel is arranged corresponding to the side frame, and the siphon hole is arranged on the inner side of the cartridge frame; the bottom cover and the bottom plate are combined to form the bottom flow channel, and the bottom plate is provided with the first discharge port; the inner cleaning brush is arranged on the side frame.

11. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an impeller assembly arranged in the water filter chamber, and the impeller assembly includes a mounting seat and an impeller body that can rotate in the impeller chamber of the mounting seat; the exoskeleton is transmission-connected to the impeller body, and the mounting seat is provided with a first water inlet connected to the siphon flow channel, and a drain outlet connected to the sewage outlet.

12. The pre-filter according to claim 11, characterized in that: A water retaining ring is provided at the bottom of the outer frame, and a water retaining ring is provided at the mounting seat. The water retaining ring and the water retaining ring cooperate to form a water retaining channel, and the siphon flow channel and the first water inlet are connected through the water retaining channel.

13. The pre-filter according to claim 11, characterized in that: The circumferential side of the mounting seat is provided with a plurality of second water inlets with the same circumferential opening at intervals, the impeller body comprises an impeller shaft and a plurality of blades obliquely arranged on the impeller shaft, and the water flow from the first water inlet and the second water inlet can cause the blades to drive the impeller shaft to rotate.

14. The pre-filter according to claim 11, characterized in that: The impeller body comprises an impeller shaft. In the impeller cavity, a cavity wall of the mounting seat away from the outer frame is provided with a limiting groove. One end of the impeller shaft away from the outer frame is rotatably inserted into the limiting groove.

15. The pre-filter according to claim 14, characterized in that: The mounting seat is further provided with a ball, which is arranged at the bottom of the limiting groove and in rolling contact with the impeller shaft.

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

17. A water system, characterized in that: The method comprises a pre-filter as claimed in any one of claims 1 to 16.

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