Pre-filter and water system

Abstract

The utility model discloses a prefilter and water consuming system relates to prefilter technical field, wherein prefilter includes shell, filter subassembly and outer skeleton, the shell is provided with water filtration cavity, and is communicated water inlet, water outlet and drain outlet of water filtration cavity, water inlet is communicated with water supply end, water outlet is communicated with water consuming end; the filtering assembly is arranged in the water filtering cavity and comprises a plurality of filtering modules distributed in the first direction, each filtering module is provided with a water passing cavity, a first water passing opening and a second water passing opening, the first water passing openings and the second water passing openings are communicated with the water filtering cavity, the second water passing openings are provided with filtering pieces, and at least part of each filtering piece is obliquely arranged; the outer framework is arranged on the outer side of the filtering assembly 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. According to the technical scheme provided by the utility model, the filtering assembly can be flushed, so that the filtering effect of the filtering assembly is ensured.

Description

Technical Field

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

[0002] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term disrepair and aging of tap water pipes, the water contains a large amount of large particles harmful to the human body, such as mud, rust, and bloodworms, which seriously affect the health of residents. Therefore, a pre-filter is provided, which is equipped with a filter assembly and other structures inside the pre-filter to filter out large particles before the tap water is used. However, while the pre-filter is filtering the water, impurities will adhere to the water filter cavity, especially the surface of the filter assembly. Over time, these impurities will clog the filter assembly and reduce the filtering effect of the filter assembly. Utility Model Content

[0003] The main purpose of the utility model is to provide a pre-filter and a water system, aiming to realize flushing of the filter component, so as to ensure the filtering effect of the filter component and prolong the service life of the pre-filter.

[0004] To achieve the above-mentioned purpose, 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, 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 disposed in the water filter chamber and comprising a plurality of filter modules distributed along a first direction, the filter modules being provided with a water flow chamber, a first water flow port, and a second water flow port, the first water flow port and the second water flow port being connected to the water filter chamber, the second water flow port being provided with a filter element, the filter element being at least partially inclined; and

[0007] The outer skeleton is arranged on the outside of the filter component 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] In one embodiment, the siphon hole is arranged side by side with the filter element in the first direction.

[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 siphon hole is arranged side by side with the outer ring edge in the first direction.

[0010] 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 siphon hole is arranged corresponding to at least one of the two filter elements.

[0011] In one embodiment, a first connection structure and a second connection structure are respectively provided on both sides of the filter modules distributed along the first direction. The first connection structure of one filter module is used to be detachably connected to the second connection structure of another filter module to fix the two filter modules.

[0012] In one embodiment, the siphon flow channel includes a side wall flow channel extending along the first direction and located on the outside 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.

[0013] In one embodiment, at least two side wall flow channels are provided, and the at least two side wall flow channels are spaced apart and arranged on opposite sides of the filter assembly.

[0014] In one embodiment, the siphon flow channel further 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 outlet.

[0015] In one embodiment, the exoskeleton includes a cartridge rack and a bottom cover, the cartridge rack includes a base and a side frame arranged on the base, 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 rack; the bottom cover and the base cover together form the bottom flow channel, and the base is provided with the first discharge port.

[0016] 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.

[0017] 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.

[0018] 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, and 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.

[0019] 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 skeleton is provided with a limiting groove, and one end of the impeller shaft away from the outer skeleton is rotatably inserted into the limiting groove.

[0020] In one embodiment, the mounting seat is further provided with a ball, which is arranged at the bottom of the limiting groove and is in rolling contact with the impeller shaft.

[0021] In one embodiment, the outer frame is rotatably sleeved on the outer side of the filter assembly, and an inner cleaning brush is installed on the inner side of the outer frame. The inner cleaning brush is provided with a cleaning portion for cleaning the outer surface of the filter element.

[0022] In one embodiment, the pre-filter further includes a water distributor for generating a swirl, and the outer frame is further provided with a water flow driving member, which can drive the outer frame to rotate under the drive of water flow.

[0023] The utility model also provides a water use system, comprising the aforementioned pre-filter.

[0024] The technical solution of the present utility model is to provide a siphon channel and siphon holes on the exoskeleton. When the impurities and particulate matter intercepted by the filter assembly are impacted by the water flow and fall off, they can be sucked into the siphon hole and siphon channel by the siphon effect and discharged more efficiently. In other words, the impurities and particulate matter intercepted by the filter assembly can be more quickly and effectively guided to the sewage outlet during the flushing phase, and ultimately discharged through the sewage outlet. 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

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0026] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present utility model;

[0027] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0028] Figure 3 for Figure 2 Cross-sectional view at the middle BB;

[0029] Figure 4 for Figure 3 A partial enlarged view of point C in the middle;

[0030] Figure 5 for Figure 3 Schematic diagram of the positional relationship among the exoskeleton, filter assembly and water distributor;

[0031] Figure 6 for Figure 2 Schematic diagram of the installation relationship between the outer skeleton and the inner cleaning brush (water flow drive member is not shown);

[0032] Figure 7 for Figure 2 Schematic diagram of the exoskeleton structure;

[0033] Figure 8 for Figure 7 An exploded view of some parts of the exoskeleton shown;

[0034] Figure 9 for Figure 2 A front view of the inner cleaning brush;

[0035] Figure 10 for Figure 2 Schematic diagram of the positional relationship between the filter assembly and the water distributor;

[0036] Figure 11 for Figure 10 a front view of the structure shown;

[0037] Figure 12 for Figure 11 Cross-sectional view at DD in the middle;

[0038] Figure 13 for Figure 4 Schematic diagram of the structure of the impeller assembly.

[0039] Description of Figure Numbers:

[0040] 100, housing;

[0041] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet;

[0042] 20, valve head; 201, water inlet; 202, water outlet;

[0043] 30. Filter assembly; 301. First connection structure; 302. Second connection structure; 300. Filter module; 320. Filter element; 330. First water outlet; 340. Water passage cavity; 350. Second water outlet;

[0044] 40. Impeller assembly; 401. Impeller chamber; 402. First water inlet; 403. Second water inlet; 404. Drain outlet; 410. Mounting seat; 411. Limiting groove; 424. Water retaining ring; 430. Ball bearing; 440. Impeller body; 441. Impeller shaft; 442. Blades; 446. Flat position;

[0045] 50. Exoskeleton; 501. Siphon channel; 501a. Side channel; 501b. Bottom channel; 502. Water drive element; 503. First discharge port; 504. Second discharge port; 510. Drum rack; 511. Chassis; 512. Side frame; 515. Water retaining ring; 518. Snap-fit ​​groove; 520. Bottom cover; 531. Siphon hole; 540. Water retaining plate; 541. Driving surface;

[0046] 60. Water distributor; 601. Guide vane;

[0047] 70. Internal cleaning brush; 710. Cleaning unit; 720. Base unit;

[0048] 80. Sewage discharge assembly; 820. Sewage discharge valve.

[0049] 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

[0050] 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 embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0051] 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 indications will also change accordingly.

[0052] 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 for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such 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 this field to implement. When the combination of technical solutions is mutually 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.

[0053] 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.

[0054] 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, impurities attached to the surface of the filter element need to be rinsed in situ from time to time and then discharged 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.

[0055] However, on one hand, the filter assembly of the existing pre-filter is a straight-cylinder filter structure with a small filter area, which results in a low filtration efficiency of the filter assembly.

[0056] On the other hand, during the flushing process, although the exoskeleton increases the flow convergence of water, the impact effect of water on the components inside the water filter chamber, especially the filter assembly, is 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.

[0057] Before introducing the technical solution of this utility model, we first introduce the water filtering process of the pre-filter. Some pre-filters on the market usually have a flushing function, that is, they can be cleaned regularly to discharge the large particles that were previously intercepted, thereby increasing the service life of the pre-filter. During the use of the pre-filter, if Figures 1 to 3 As shown, tap water first enters the water filter chamber 101 of the housing 100 through the water inlet 201, where it is filtered by the filter assembly 30 in the water filter chamber 101. Then, under pressure, the filtered tap water flows out of the water outlet 202 to the water-using end (water-using equipment). After a period of use, a certain amount of impurities will inevitably accumulate in the filter assembly 30 and the water filter chamber 101. At this point, the water outlet 202 can be closed, and the sewage outlet 102 of the housing 100 can be opened, allowing tap water from the water inlet 201 to flush the filter assembly 30, the exoskeleton 50, and the water filter chamber 101, thereby improving the filtering capacity of the filter assembly 30.

[0058] The utility model provides a pre-filter.

[0059] See also Figures 1 to 4 、 Figure 8 、 Figure 11 and Figure 12 In one embodiment of the present invention, the pre-filter comprises:

[0060] 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;

[0061] 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 modules 300 are provided with a water flow chamber 340, a first water flow port 330, and a second water flow port 350. The first water flow port 330 and the second water flow port 350 communicate with the water filter chamber 101. The second water flow port 350 is provided with a filter element 320; and

[0062] The outer skeleton 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.

[0063] The technical solution of the present utility model, by providing a siphon channel 501 and a siphon hole 531 on the exoskeleton 50, allows the impurities and particulate matter intercepted by the filter assembly 30 to fall off due to the impact of the water flow and be sucked into the siphon hole 531 and the siphon channel 501 by the siphon effect, and to be discharged more efficiently. In other words, during the flushing phase, the impurities and particulate matter intercepted by the filter assembly 30 can be more quickly and effectively guided to the sewage outlet 102, and ultimately discharged through the sewage outlet 102, thereby improving the flushing effect of the water filter chamber 101, and particularly the filter assembly 30. 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.

[0064] 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 systems. For example, the 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 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 the health level of residents.

[0065] It should be noted that the water supply end can be a tap, water tower, or well water, and the water consumption end can be a faucet, shower, or 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 can be a stainless steel filter mesh or a PP cotton filter mesh.

[0066] In addition, the multiple indicated in this solution can be understood as greater than or equal to two.

[0067] See also Figures 1 to 3 Optionally, the housing 100 includes a valve head 20, a filter bottle 10, and a drain assembly 80. The water inlet 201 and the water outlet 202 are formed on the valve head 20. The drain assembly 80 is mounted on a side of the filter bottle 10 away from the valve head 20. The drain assembly 80 is formed with a drain channel, and the drain port 102 is located on the side of the drain channel away from the valve head 20. This structure is simple and easy to implement. The drain assembly 80 may include a drain valve 820, and the drain channel is interrupted or connected via the drain valve 820.

[0068] 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 as possible to the filter element 320, thereby promptly absorbing impurities that fall off the filter element 320 during the flushing phase. Of course, in other embodiments, the siphon hole 531 can also be arranged offset from the filter element 320 in the first direction.

[0069] See also Figure 4 and Figure 12 Optionally, the filter element 320 is at least partially tilted. By tilting the filter element 320, the filter area of ​​the filter element 320 is increased compared to an axially extending cylindrical structure of the filter element 320. Under the same axial height, the filter area of ​​the filter element 320 can be increased. Due to the increased filter area of ​​the filter element 320, the filter element 320 can withstand a greater flow load, thereby improving filtration efficiency. Furthermore, because the filter area of ​​the filter element 320 is sufficiently large, even if a local area of ​​the filter element 320 becomes clogged, the remaining area of ​​the filter element 320 can continue to withstand a greater flow load, thereby helping to extend the service life of the filter module 300, reduce replacement frequency, and thus lower maintenance costs.

[0070] Secondly, the filter assembly 30 of this solution includes multiple filter modules 300. Since the filter area on each filter module 300 is certain, this solution can increase the total filter 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 filter area.

[0071] See also Figure 4 and Figure 12 Optionally, the filter element 320 is annularly arranged 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 axially to one side of the inner ring edge. The siphon holes 531 are arranged side by side with the outer ring edge in the first direction. It is understood that the outer ring edge is closer to the inner side surface of the exoskeleton 50 than the inner ring edge, and the filter element 320 is structured to extend obliquely from the inner ring edge toward the outer ring edge, so that impurities that fall 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 holes 531 adjacent to the outer ring edge. This can improve the siphon effect and efficiency. Of course, in other embodiments, the siphon holes 531 can also be arranged side by side with the inner ring edge in the first direction, or the siphon holes 531 can be located between the inner ring edge and the outer ring edge in the first direction.

[0072] See also Figure 12 Optionally, 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 tapered shape in opposing directions. The siphon hole 531 is provided corresponding to at least one of the two filter elements 320. In this manner, the two filter elements 320 of the same filter module 300 are arranged in a tapered shape in opposing directions, creating an outwardly opening bell-shaped space between the two adjacent filter elements 320 of the two adjacent filter modules 300. This bell-shaped space facilitates the flow of impurities shed from the filter elements 320 toward the siphon hole 531. In this embodiment, optionally, both filter elements 320 of the same filter module 300 are provided with a corresponding siphon hole 531, so that impurities shed from each filter element 320 can be specifically sucked away by its corresponding siphon hole 531, thereby improving the siphon effect and efficiency. Of course, in other embodiments, the two filter elements 320 of the same filter module 300 may each have only one siphon hole 531.

[0073] See also Figure 12 Optionally, a first connecting structure 301 and a second connecting structure 302 are respectively provided on both sides of the filter module 300 distributed along the first direction. The first connecting structure 301 of one filter module 300 is used to be detachably connected to the second connecting structure 302 of another filter module 300 to fix the two filter modules 300.

[0074] 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, so that 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), thereby achieving the effect of adjusting the size of the filter component 30, and further 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 certain, 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.

[0075] 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 having to find a suitable filter module 300 for installation, thereby improving the installation efficiency of the filter assembly 30.

[0076] Furthermore, the first connection structure 301 of one filter module 300 is configured to be removably connected to the second connection structure 302 of another filter module 300. As will be appreciated, this removable connection allows for easy separation of components without damaging the connector itself or adjacent components. This feature allows for quick and efficient maintenance and replacement of the filter assembly 300, reducing both the difficulty and cost of repair. The ease of operation of the removable connection significantly saves time during maintenance and replacement of the filter assembly 300. Furthermore, the removable connection allows for quick replacement of faulty filter modules 300, thereby reducing water outage time and improving maintenance efficiency. Furthermore, compared to non-removable connections, removable connections reduce the likelihood of entire components being scrapped due to inability to disassemble, thus reducing resource waste. Furthermore, the removable connection allows for regular or irregular inspection and maintenance of the filter assembly 300 to ensure its stability and safety, helping to promptly identify and address potential safety hazards.

[0077] See also Figure 12In one embodiment, the first connecting structure 301 of a filter module 300 is used to snap-fit ​​with the second connecting 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, snap-fitting 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 snap-fit ​​operation process is simple and clear, and easy to master. Whether it is a worker on the production line or an ordinary consumer, both can easily complete the assembly and disassembly work.

[0078] Of course, in other embodiments, the first connection structure 301 of one 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.

[0079] See also Figure 4 、 Figure 6 and Figure 8 Optionally, the siphon flow channel 501 includes a side wall flow channel 501a extending along the first direction and located on the outside of the filter assembly 30. The side wall flow channel 501a is provided with a plurality of siphon holes 531 at intervals along the first direction, and one filter element 320 is provided with at least one siphon hole 531. In this way, during the flushing stage, the particles shed 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, one siphon hole 531 can also be provided corresponding to multiple filter elements 320. For example, one siphon hole 531 is provided between two adjacent filter elements 320 to be responsible for the siphon effect of the two filter elements 320.

[0080] See also Figure 8 To further enhance flushing efficiency and effectiveness, at least two sidewall channels 501a may be provided, with the at least two sidewall channels 501a spaced apart on opposite sides of the filter assembly 30. In this manner, the multiple siphon holes 531 on the multiple sidewall channels 501a operate simultaneously, providing a more efficient siphoning effect on the filter element 320. In this embodiment, two sidewall channels 501a may be provided. Of course, in other embodiments, three or more sidewall channels 501a may be provided, or only one sidewall channel 501a may be provided.

[0081] See also Figure 8Furthermore, the siphon channel 501 also includes a bottom channel 501b that connects the multiple sidewall channels 501a. The bottom channel 501b is provided with a first discharge port 503 and is located on the side of the filter assembly 30 near the sewage outlet 102. In this way, the water flows in the multiple sidewall channels 501a are collected together by the bottom channel 501b and then discharged through the first discharge port 503, which can enhance the siphon effect and simplify the structure of the exoskeleton 50. Of course, in other embodiments, the bottom channel 501b can be omitted, and the first discharge port 503 can be directly formed at the lower end of the sidewall channel 501a.

[0082] Please refer to the figure Figure 6 and Figure 8 Furthermore, the exoskeleton 50 includes a cartridge rack 510 and a bottom cover 520. The cartridge rack 510 includes a bottom plate 511 and side frames 512 disposed on the bottom plate 511. The sidewall flow channels 501a are disposed corresponding to the side frames 512, and the siphon hole 531 is disposed on the inner side of the cartridge rack 510. The bottom cover 520 and the bottom plate 511 are combined 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 to providing a through-going bottom flow channel 501b within the bottom plate 511, the structure is simpler and easier to manufacture. Furthermore, cleaning is more convenient, reducing the possibility of dirt accumulating inside and clogging the filter element 320, thereby preventing siphon failure. Furthermore, compared to existing solutions, it is easier to increase the size of the siphon flow channel 501, thereby improving cleaning effectiveness.

[0083] 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 set corresponding to the side frame 512, which means that the side wall flow channel 501a is set in the side frame 512 part, and does not limit the formation method of the side wall flow channel 501a.

[0084] See also Figure 8 Furthermore, in order to enhance drainage efficiency, the chassis 511 is also provided with a second drain port 504, which connects the inner side of the cartridge rack 510 and the outside of the cartridge rack 510. The addition of the second drain port 504 provides an additional drain channel for the accumulated water inside the cartridge rack 510, which helps to speed up the water flow and improve 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, ensuring 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.

[0085] Depending on the amount of water accumulated inside the drum rack 510 and the drainage requirements, multiple second drain ports 504 can be provided on the chassis 511. These second drain ports 504 can be evenly distributed or arranged specifically based on the area of ​​water accumulation to maximize drainage efficiency. Specifically, multiple second drain ports 504 are provided, each located between two adjacent siphon channels 501 and closer to the outside of the chassis 511 relative to the first drain ports 503. The second drain ports 504 are arranged symmetrically with the first drain ports 503 to maintain the balance and aesthetics of the overall structure. This arrangement also helps to disperse drainage pressure and improve drainage efficiency.

[0086] See also Figure 8 Optionally, in this embodiment, three siphon channels 501 are designed on the exoskeleton 50, each evenly spaced at 120° angles. Seven elliptical siphon holes 531 are designed on the wall of the siphon element. 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.

[0087] The base 511 and side frames 512 can be integrally formed, or the side frames 512 can be fixed to the base 511 via screws or other means. The base 511 of the cartridge holder 510 is circular, and the side frames 512 surround the base 511 and are designed around the outer edge of the filter assembly 30. The side frames 512 generally appear as a portion of an annular or cylindrical shape, but are not completely enclosed to allow water to flow through. The shape of the side frames 512 matches the outer shape of the filter assembly 30, ensuring a close fit and support for the filter assembly 30 while maintaining effective water circulation around the filter assembly 30.

[0088] See also Figure 4 、 Figure 5 and Figure 8 Optionally, the bottom cover 520 and the base 511 cover each other 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 base 511 are detachably connected, such as by screws or snaps. The detachable design of the bottom cover 520 makes cleaning and maintenance simple and convenient, allowing users to complete these tasks themselves without having to hire a professional for on-site service, thereby reducing maintenance costs.

[0089] In one embodiment, the exoskeleton 50 is rotatably mounted on the outside of the filter assembly 30, and the exoskeleton 50 or the filter assembly 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 assembly 30 can be more effectively guided to the bottom flow channel 501b, and finally discharged through the drain outlet 102.

[0090] See also Figure 2 、 Figure 6 and Figure 9 In a further embodiment, the cleaning mechanism includes an inner cleaning brush 70 disposed on the inner side of the outer frame 50. The inner cleaning brush 70 has a cleaning portion 710 for cleaning the outer surface of the filter element 320. As the outer frame 50 rotates with the water flow, the cleaning portion 710 rotates with the filter element 320, cleaning the filter element 320. This removes impurities from the filter element 320, draws the impurities into the siphon channel 501 through the siphon hole 531, and then discharges the impurities into the sewage outlet 102 through the first discharge port 503.

[0091] 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 .

[0092] See also Figure 2 、 Figure 9 and Figure 12 Optionally, the filter element 320 is annular, with its axis extending along the first direction. The filter element 320 has an inner annular edge and an outer annular edge, with the outer annular edge located axially to one side of the inner annular edge. The cleaning portion 710 is disposed side by side with the filter element 320 in the first direction. This makes the structure more compact and avoids the problem of the suspended portion of the inner cleaning brush 70 being excessively long, thereby improving the structural stability and reliability of the inner cleaning brush 70. Of course, in other embodiments, the cleaning portion 710 may be offset from the filter element 320 in the first direction.

[0093] 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 brush 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 brushed off by the inner cleaning brush 70, 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.

[0094] See also Figure 6Optionally, the siphon channel 501 includes at least two sidewall channels 501a extending in the first direction and located outside the filter assembly 30. The sidewall channels 501a are provided with siphon holes 531. At least two internal cleaning brushes 70 are provided, with the internal cleaning brushes 70 and the sidewall channels 501a alternately distributed along the circumference. This improves the efficiency and effectiveness of scrubbing and siphoning during the flushing phase. Of course, in other embodiments, only one siphon channel 501 and one internal cleaning brush 70 may be provided.

[0095] See also 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 tapered shape in directions away from each other, while the cleaning portion 710 is arranged in a gradually expanding shape in a direction away from the filter assembly 30. In this way, the two filter elements 320 of the same filter module 300 are tapered in directions away from each other, so that a bell-shaped space with an outward opening is formed between the two adjacent filter elements 320 of two adjacent filter modules 300. This bell-shaped space facilitates the flow of impurities that fall off the filter elements 320 to the siphon hole 531. Furthermore, the two opposing sides of the cleaning portion 710 in the first direction can more comprehensively clean 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 expanding shape in directions away from each other.

[0096] It should be noted that Figure 9 The axonometric view and the front view of the inner cleaning brush 70 are shown at the same time, wherein the axonometric view is located at Figure 9 The left area of ​​​​the main view is located in Figure 9 As can be seen from the front view of the inner cleaning brush 70, 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.

[0097] Optionally, at least one internal cleaning brush 70 is provided with a cleaning portion 710 on opposite sides in the first direction, and the two cleaning portions 710 are respectively configured to 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 is capable of simultaneously cleaning the two facing filter elements 320 of these two adjacent filter modules 300. This improves cleaning efficiency and effectiveness. Of course, in other embodiments, an internal cleaning brush 70 may be provided with only one cleaning portion 710.

[0098] See also Figure 9Optionally, the inner cleaning brush 70 further includes a base portion 720 protruding from the inner circumference of the outer frame 50, and a cleaning portion 710 connected to the outer circumference of the base portion 720. Each base portion 720 is provided with two cleaning portions 710 extending in opposite directions in the first direction. The side of the cleaning portion 710 away from the base portion 720 is arranged in an interference fit with the outer surface of the filter element 320. This ensures that the cleaning portion 710 exerts a certain amount of friction on the filter element 320, thereby improving the cleaning effect, while also maintaining the relative movement between the cleaning portion 710 and the filter element 320.

[0099] See also Figure 9 In this embodiment, the internal cleaning brush 70 has two types of structures. For the internal cleaning brush 70 disposed at the connection between the two filter modules 300, two cleaning portions 710 extending in opposite directions in the axial direction of the outer frame 50 are disposed on a base portion 720. For the internal cleaning brush 70 disposed at the end of the filter assembly 30, only one cleaning portion 710 is required on the base portion 720. The structure of this internal cleaning brush 70 can be the structure of the aforementioned internal cleaning brush 70, which is split in half. 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 cylinder. In the latter type of internal cleaning brush 70, the base portion 720 is configured as half a cylinder, and the cleaning portions 710 are connected to the circumference of the cylinder.

[0100] 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 Figure 10 The pre-filter also includes a water distributor 60 for generating a swirling flow. The outer frame 50 is also 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 the filter bottle 10 drives the outer frame 50 to rotate relative to the filter assembly 30, causing the water in the filter bottle 10 to generate a swirling flow, which can not only improve the water flow effect of flushing the filter element 320, but also enable the sewage to be discharged from the sewage outlet 102 more quickly.

[0101] Of course, in other embodiments, the outer skeleton 50 may be rotated relative to the filter assembly 30 by an electric drive rotation or a manual drive rotation structure.

[0102] See also Figure 7 and Figure 10Optionally, the water distributor 60 is positioned closer to the water inlet 201 than the water flow driving member 502. The water distributor 60 has a plurality of guide vanes 601 distributed circumferentially and tilted relative to the axial direction. The exoskeleton 50 is provided with a plurality of water flow driving members 502, which are spaced apart along the circumference of the exoskeleton 50. The water flow driving members 502 have a plurality of water baffles 540 spaced apart along the circumference of the side frames 512. The water baffles 540 have a driving surface 541 extending along the first direction.

[0103] It can be understood that the water distributor 60 is located between the water flow drive member 502 and the water inlet 201, and the water flow from the water inlet 201 must first pass through the water distributor 60 and then flow to the water flow drive member 502. 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. There are multiple such flow channels in the circumferential direction of the filter assembly 30. In addition, the inclination direction of the guide blades 601 is relative to or obliquely relative to the drive surface 541. In this way, under the drainage action of the guide blades 601, the flow direction of the water flow flowing through the above-mentioned flow channel can impact the drive surface 541 vertically or nearly vertically, which not only ensures the size of the driving force that drives the exoskeleton 50 to rotate, but also enables the exoskeleton 50 to rotate stably. Moreover, 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.

[0104] 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 causes 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.

[0105] See also Figure 4 and Figure 13Furthermore, the pre-filter also includes an impeller assembly 40 arranged in the water filter chamber 101, 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.

[0106] During the pre-filter flushing phase (i.e., when the drain valve 820 is open), water enters the pre-filter through the first water inlet 402 of the impeller assembly 40. The impeller body 440 rotates under the impact of the water flow. This rotational motion creates a vortex effect, causing the water flow to more intensely agitate within the filter bottle 10, thereby more effectively removing impurities and dirt adhering to the filter media surface. Compared to static water flow, the dynamic cleaning of the impeller assembly 40 can significantly improve the efficiency and effectiveness of the flushing process. Furthermore, the rotational motion of the impeller body 440 stirs up impurities and dirt within the filter bottle 10, suspending them in the water. These impurities are then discharged from the filter bottle 10 through the drain valve 820 and drain port 102 with the water flow, preventing the impurities from redepositing on the filter media and ensuring a thorough flushing process. Furthermore, by enhancing the flushing effect, the impeller assembly 40 effectively prevents clogging of the filter media, maintaining unimpeded water flow, and preserving the filtration efficiency of the pre-filter. This is crucial for maintaining stable water pressure and clean water quality in home or commercial systems.

[0107] 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.

[0108] The impeller assembly 40 of the present invention can be used alone in a traditional pre-filter. Most traditional pre-filters use 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 power of the water flow 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 does not require additional energy consumption, which helps to reduce overall operating costs and reduce water waste.

[0109] Furthermore, the exoskeleton 50 is connected to the impeller body 440 in a transmission manner, 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. The impeller body 440 itself rotates under the impact of the water flow and links 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.

[0110] Optionally, the outer skeleton 50 is combined with the inner cleaning brush 70, and the outer skeleton 50 and the impeller body 440 rotate to drive 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.

[0111] There are many structural forms for achieving transmission connection between the outer frame 50 and the impeller body 440, for example, see Figure 4 and Figure 13 In one embodiment, a snap-fit ​​groove 518 is recessed on one side of the exoskeleton 50 facing the mounting seat 410, and the impeller body 440 includes an impeller shaft 441. The impeller shaft 441 has at least one flat position 446 arranged circumferentially. The impeller shaft 441 is inserted into the snap-fit ​​groove 518, and the flat position 446 is adapted to abut against the side groove wall of the snap-fit ​​groove 518.

[0112] It is understood that the engaging groove 518 and the end of the impeller shaft 441 are adapted to be inserted or interference fit. Around the circumference of the engaging groove 518, there are flattened portions 446 between the engaging groove 518 and the impeller shaft 441. During the rotation of the impeller body 440, the flattened portions 446 prevent the impeller body 440 from sliding against each other, thereby pulling the exoskeleton 50 to rotate. Furthermore, the axial insertion portion between the impeller shaft 441 and the engaging groove 518 improves the efficiency of power transmission.

[0113] Of course, in other embodiments, the exoskeleton 50 may have multiple first protrusions distributed along the circumference on one side of the mounting seat 410, and the impeller shaft 441 may have multiple second protrusions provided on one end close to the exoskeleton 50. The multiple second protrusions are distributed along the circumference of the impeller shaft 441, and a first protrusion is clamped between two adjacent second protrusions.

[0114] See also Figure 8 It is worth mentioning that the three siphon channels 501 at the bottom of the exoskeleton 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 into the impeller chamber 401, thereby improving the rotation efficiency of the impeller body 440.

[0115] See also Figure 13Optionally, multiple second water inlets 403 with the same circumferential opening are spaced apart on the circumferential side of the mounting base 410. The impeller body 440 includes an impeller shaft 441 and multiple blades 442 obliquely disposed on the impeller shaft 441. Water flowing through both the first water inlet 402 and the second water inlet 403 can cause the blades 442 to rotate the impeller shaft 441. In this way, the first water inlet 402 and the second water inlet 403 increase the flow path and flow rate of water entering the impeller chamber 401. Providing multiple water inlets can create a more complex flow pattern within the impeller chamber 401, providing sufficient power for the rotation of the impeller body 440.

[0116] See also Figure 4 and Figure 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 curved into an arc surface, part of the arc surface faces the first water inlet 402, and the other part faces the second water inlet 403, so that the blade 442 can be affected by the water flow from the second water inlet 403 on the side and the first water inlet 402 on the top and drive the impeller shaft 441 to rotate.

[0117] The impeller chamber 401 serves as an enclosed space within which the impeller body 440 rotates and is located within the mounting base 410. After water flows from the filter bottle 10 through the filter assembly 30 and is filtered, a portion of the water (i.e., the wastewater to be discharged) enters the impeller chamber 401 through the first water inlet 402 and the second water inlet 403. The water interacts with the rotating impeller body 440, generating a rotational force and a stirring effect that helps flush out impurities remaining within the filter assembly 30. When the water enters the impeller chamber 401, it impacts the impeller body 440 and drives it to rotate. The rotating impeller body 440 not only enhances the rotational force and stirring effect of the water flow, but also, through its unique blade 442 design, directs the water flow toward the sewage outlet 102, improving sewage discharge efficiency and cleanliness. A drain outlet 404 is provided at the bottom or side of the mounting base 410 (typically connected to a drain valve 820). Its primary function is to discharge wastewater treated by the impeller assembly 40 out of the pre-filter.

[0118] 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 skeleton 50 is recessed with a limiting groove 411, and one end of the impeller shaft 441 away from the outer skeleton 50 is rotatably inserted into 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 skeleton 50 is the cavity wall of the impeller cavity 401 relative to the first avoidance port, and the end of the impeller shaft 441 is axially rotatably inserted into 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 skeleton 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.

[0119] Please refer to Figure 4 Furthermore, the mounting base 410 is further provided with a ball bearing 430, which is disposed at the bottom of the retaining groove 411 and in rolling contact with the impeller shaft 441. It should be noted that the ball bearing 430 can freely rotate and roll within the retaining groove 411. During the rotation of the impeller body 440, rolling friction occurs between the ball bearing 430 and the impeller shaft 441, reducing the friction experienced by the impeller shaft 441, thereby improving the smoothness and efficiency of the rotation of the impeller body 440. Furthermore, the provision of the ball bearing 430 also reduces the length of the protrusion of the impeller shaft 441 inserted into the retaining groove 411, increasing the protrusion's bending resistance, ensuring that the impeller shaft 441 can withstand the impact of water flow, thereby improving the rotational stability of the impeller body 440. Of course, in other embodiments, the ball bearing 430 may not be provided, and the surface where the impeller shaft 441 and the retaining groove 411 abut each other may be relatively smooth, thereby providing rotational support through sliding friction.

[0120] See also Figure 4 and Figure 13The bottom of the exoskeleton 50 is provided with a water retaining ring 515, and the mounting seat 410 is provided with a water retaining ring 424. 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. When discharging sewage, all water in the filter bottle 10 other than the siphon flow channel 501 can enter from these two second water inlets 403. Four oblique first water inlets 402 are designed on the top of the mounting seat 410. 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 top of the mounting seat 410, which cooperates with the water retaining ring 424 of the exoskeleton 50 to prevent excessive water from the outside from flowing into the first water inlet 402 on the top of the mounting seat 410.

[0121] 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.

[0122] Specifically, in the filtering mode, the water outlet 202 is in the open state and the drain valve 820 is in the closed state. 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 is rotated by the impact of the water flow from the water distributor 60, and drives the exoskeleton 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.

[0123] It can be seen that in the filtering mode, the approximate flow direction of the water entering the shell 100 is: first flowing along the axial direction of the filter component 30 toward the direction away from the valve head 20, then flowing along the radial direction of the filter component 30 from the periphery of the filter component 30 to the center of the filter component 30, and then flowing along the axial direction of the filter component 30 toward the direction close to the valve head 20.

[0124] In flushing mode, the water outlet 202 is closed and the drain valve 820 is open. Water from the water supply end flows into the housing 100 from the water inlet 201, then flows through the water distributor 60 to the water drive element 502 and the water filter chamber 101. At this time, the water drive element 502 is impacted by the water flow from the water distributor 60 and rotates, driving the outer frame 50 to rotate, causing the water in the water filter chamber 101 to generate a swirling motion. The swirling water can rinse the outer surface of the filter element 320. At the same time, the internal cleaning brush 70 rotates with the outer frame 50 to scrub the outer surface of the filter element 320. The water in the water filter chamber 101 carries impurities that have fallen off from the filter element 320. A portion of the water flows into the siphon channel 501 through the siphon hole 531 and flows to the first drain port 503, while the other portion flows directly to the second drain port 504 at the bottom of the outer frame 50. The water flowing out of 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 drain port 102, and finally flows out to the outside through the drain port 102.

[0125] It can be seen that in the flushing mode, the approximate flow direction of the water entering the shell 100 is: first flowing 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 further flows into the impeller assembly 40 in the direction away from the valve head 20, and finally flows to the sewage outlet 102.

[0126] The present utility model 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.

[0127] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All 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 application 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, the water inlet is connected to the water supply end, and the water outlet is connected to the water use end; a filter assembly disposed in the water filter chamber and comprising a plurality of filter modules distributed along a first direction, the filter modules being provided with a water flow chamber, a first water flow port, and a second water flow port, the first water flow port and the second water flow port being connected to the water filter chamber, the second water flow port being provided with a filter element, the filter element being at least partially inclined; and The outer skeleton is arranged on the outside of the filter component 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.

2. The prefilter according to claim 1, wherein The siphon hole is arranged side by side with the filter element in the first direction.

3. The prefilter according to claim 2, wherein: The filter element is arranged in an annular shape, and its 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 siphon hole is arranged side by side with the outer ring edge in the first direction.

4. The prefilter according to claim 2, wherein: 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 siphon hole is arranged corresponding to at least one of the two filter elements.

5. The prefilter according to claim 1, wherein: The filter modules are respectively provided with a first connection structure and a second connection structure on both sides distributed along the first direction. The first connection structure of one filter module is used to be detachably connected to the second connection structure of another filter module to fix the two filter modules.

6. The prefilter according to claim 1, wherein: The siphon flow channel includes a side wall flow channel extending along the first direction and located outside 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.

7. The prefilter according to claim 6, characterized in that There are at least two side wall flow channels, and the at least two side wall flow channels are spaced apart and arranged on opposite sides of the filter assembly.

8. The pre-filter according to claim 6, wherein: The siphon flow channel further includes a bottom flow channel communicating with a plurality of the 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.

9. The prefilter according to claim 8, characterized in that The exoskeleton includes a cartridge rack and a bottom cover, the cartridge rack includes a base and a side frame arranged on the base, 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 rack; the bottom cover and the base cover together form the bottom flow channel, and the base is provided with the first discharge port.

10. The pre-filter according to claim 1, wherein: 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.

11. The prefilter according to claim 10, wherein: 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.

12. The prefilter according to claim 10, wherein: 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 includes an impeller shaft and a plurality of blades obliquely arranged on the impeller shaft. The water flow from the first water inlet and the second water inlet can cause the blades to drive the impeller shaft to rotate.

13. The pre-filter according to claim 10, wherein: 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.

14. The pre-filter according to claim 13, wherein: The mounting seat is further provided with a ball, which is arranged at the bottom of the limiting groove and is in rolling contact with the impeller shaft.

15. The pre-filter according to claim 1, wherein The outer frame is rotatably sleeved on the outer side of the filter assembly, and an inner cleaning brush is installed on the inner side of the outer frame. The inner cleaning brush is provided with a cleaning portion, and the cleaning portion is used to clean the outer surface of the filter element.

16. The pre-filter according to claim 1, wherein The pre-filter further comprises a water distributor for generating a swirl, and the outer frame is further provided with a water flow driving member, which can drive the outer frame to rotate under the drive of the water flow.

17. A water system, characterized in that: Comprising the pre-filter according to any one of claims 1 to 16.

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