Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water system, and relates to the technical field of filters, the pre-filter comprises a valve head, a filter bottle, a filter assembly and a reversing piece, a water filtering cavity is formed in the filter bottle, the valve head is provided with a water inlet and a water outlet which are communicated with the water filtering cavity, and the side, away from the valve head, of the filter bottle is provided with a sewage draining outlet communicated with the water filtering cavity; the filtering assembly comprises a filtering module, the filtering module comprises a filtering piece, at least part of the filtering piece is obliquely arranged, the reversing piece is hollow, the inner circumferential side of the reversing piece communicates with the water outlet and the water filtering cavity, the reversing piece comprises a communicating part and a blocking part, and the reversing piece is movably inserted into the filtering assembly; and a flushing flow path between the water inlet and the reversing piece is communicated through the communicating part and is cut off through the blocking part. According to the technical scheme, the filtering effect of the filtering assembly is guaranteed, and the service life of the pre-filter is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of 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-using system, aiming to ensure the filtering effect of the filtering component 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] A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet connected to the water filter cavity, and a sewage outlet connected to the water filter cavity is provided on a side of the filter bottle away from the valve head;

[0006] A filter assembly is arranged in the water filter cavity, the filter assembly includes a filter module, a water passage cavity is formed inside the filter module, a first water passage port communicating with the water passage cavity is arranged in the axial direction of the filter module, a second water passage port communicating with the water passage cavity is arranged in the circumferential direction of the filter module, the filter module includes a filter element arranged at the second water passage port, and the filter element is at least partially arranged in an inclined manner; and

[0007] The reversing member is hollow, the inner circumference of the reversing member is connected to the water outlet and the water filter chamber, the reversing member includes a connecting portion and a blocking portion, the reversing member can be movably inserted in the filter assembly so that the pre-filter can switch between a filtering mode and a flushing mode, and the flushing flow path between the water inlet and the reversing member is connected through the connecting portion and cut off through the blocking portion.

[0008] In one embodiment, the filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, and each of the support frames is provided with the second water passage port.

[0009] In one embodiment, the supporting skeleton includes an oblique supporting portion, the two ends of the oblique supporting portion are respectively connected to a first ring portion and a second ring portion, the two oblique supporting portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique supporting portion.

[0010] In one embodiment, the oblique support portion is formed with a plurality of the second water outlets distributed at intervals, and the filter module is provided with a filter element corresponding to each of the support frames, and the filter element is stacked on the surface of the oblique support portion.

[0011] In one embodiment, an outer diameter of the second ring portion is greater than an outer diameter of the first ring portion.

[0012] In one embodiment, each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

[0013] In one embodiment, the valve head is provided with a water isolating ring between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolating ring, the water outlet is connected to the inner peripheral side of the water isolating ring, the connecting portion and the blocking portion are distributed axially, and the reversing member is axially movably inserted into the water isolating ring and the filter assembly.

[0014] In one embodiment, the filter assembly includes a water distributor, the water distributor is located at one end of the filter assembly close to the water isolation ring, the water isolation ring and the water distributor are jointly constructed to form a water flow structure, and the water flow structure is connected to the water inlet;

[0015] On the adjacent side of the water distributor and the water isolating ring, the water passing structure is isolated from the connecting portion in the filtering mode and is connected to the connecting portion in the flushing mode.

[0016] In one embodiment, the water isolation ring and the water distributor are spaced apart, and the water passing structure is the space between the water isolation ring and the water distributor;

[0017] In the filtering mode, the baffle is at least located between the water isolation ring and the water distributor;

[0018] In the flushing mode, the connecting portion is at least partially located between the water isolation ring and the water distributor.

[0019] In one embodiment, the filter assembly also includes a water distributor connected to the axial side of the filter module, the water distributor has a first water flow space corresponding to the first water flow port and a second water flow space corresponding to the second water flow port, the second water flow space is provided with guide blades, and the reversing member extends into the water flow chamber through the first water flow space.

[0020] In one embodiment, the reversing member also includes a hollow pipe section, a peripheral wall of the hollow pipe section is provided with a first connecting hole, the connecting portion, the blocking portion and the hollow pipe section are sequentially distributed along the axial direction, the connecting portion is plug-fitted with the water isolation ring, the blocking portion is plug-fitted with the water distributor, and the hollow pipe section extends into the water passage chamber.

[0021] In one embodiment, the first communicating hole is configured as a strip-shaped hole extending in the axial direction.

[0022] In one embodiment, the first communication hole penetrates the peripheral wall of the hollow tube segment along a tangential direction of the inner peripheral surface of the hollow tube segment.

[0023] In one embodiment, the first connecting hole is arranged in an arc shape in the penetrating direction.

[0024] In one embodiment, the first connecting hole is gradually expanded in a penetration direction from inside to outside.

[0025] In one embodiment, a plurality of arc segments are formed on the inner circumference of the hollow tube section corresponding to the first connecting hole, and the plurality of arc segments are sequentially tangently connected in the water outlet direction of the corresponding first connecting hole, and the radius increases sequentially.

[0026] In one embodiment, the inner circumference of the hollow pipe segment is formed with a first arc segment and a second arc segment corresponding to the first connecting hole. The first arc segment and the second arc segment are sequentially tangentially connected in the water outlet direction of the corresponding first connecting hole, and the radius increases sequentially. The central axis of the first arc segment is the central axis of the hollow pipe segment.

[0027] In one embodiment, the outer periphery of the hollow tube segment and the inner periphery of the filter assembly are sealed and matched, and the matching point between the two is located at an end of the first communicating hole away from the blocking portion.

[0028] In one embodiment, the filter assembly also includes an end cover, which includes a cylindrical portion and a limiting ring portion arranged around the cylindrical portion, the limiting ring portion is connected to the side of the filter module away from the water distributor, the cylindrical portion is inserted into the water passage cavity, and the outer periphery of the hollow pipe segment and the inner periphery of the cylindrical portion are sealed together.

[0029] In one embodiment, the switching member is connected to an elastic member, and under the action of the elastic member, the switching member can be maintained at a position corresponding to the filtering mode.

[0030] In one embodiment, the filter assembly includes a water distributor, the water distributor is located at one end of the filter assembly close to the water inlet, and the elastic member is installed between the reversing member and the water distributor.

[0031] In one embodiment, the barrier portion includes an annular main body extending along the axial direction of the switching member, and a barrier skirt arranged around the outer circumference of the annular main body, and one end of the elastic member is located on the inner side of the annular main body.

[0032] In one embodiment, the inner periphery of the annular main body is further provided with a water passing portion, and in the filtering mode, the water passing portion is provided with a second communicating hole, and in the filtering mode, the inner periphery of the water passing portion is connected to the inner periphery of the filter assembly through the second communicating hole;

[0033] The water distributor is provided with a blocking portion, and in the flushing mode, the blocking portion blocks the communication between the inner periphery of the water passing portion and the inner periphery of the filter assembly.

[0034] In one embodiment, one end of the elastic member is sleeved on the water passing portion, and the other end is sleeved on the blocking portion.

[0035] In one embodiment, the pre-filter further comprises an exoskeleton, the exoskeleton is rotatably mounted outside the filter assembly, the exoskeleton comprises a side frame and a chassis, the chassis is connected to the side of the side frame away from the valve head.

[0036] In one embodiment, the outer frame forms a siphon channel, the side frame is provided with a siphon hole connected to the siphon channel, the chassis is provided with a first discharge port connected to the siphon channel, and the first discharge port is connected to the sewage outlet at least in the flushing mode.

[0037] In one embodiment, an impeller assembly is also provided in the water filter chamber, and the impeller assembly includes a mounting seat and an impeller body rotatably mounted on the mounting seat, the impeller body is coaxially connected to the exoskeleton and fixed in the circumferential direction, and the mounting seat is formed with a connected water inlet and a drain, the water inlet includes a first water inlet connected to the first discharge port, and the drain port is connected to the sewage outlet.

[0038] In one embodiment, the water inlet further includes a second water inlet, the first water inlet is arranged on one axial side of the mounting seat, and the second water inlet is arranged on a circumferential side of the mounting seat;

[0039] The chassis is also provided with a second discharge port extending axially therethrough, and a water retaining structure is formed on opposite sides of the exoskeleton and the mounting seat. The water retaining structure is arranged around the first discharge port, and the second discharge port is located at the periphery of the water retaining structure. The second water inlet is connected to the second discharge port.

[0040] In one embodiment, the reversing member is further transmission-connected to a movable member, and the movable member includes a blocking portion, and the blocking portion is located on a side of the outer frame away from the valve head, and the blocking portion can detachably block at least one of the water inlet and the drain outlet;

[0041] In the filtering mode, the blocking portion blocks at least one of the water inlet and the drain outlet; in the flushing mode, both the water inlet and the drain outlet are open.

[0042] In one embodiment, the pre-filter also includes a reversing bottom shell, which is fixedly connected to the mounting seat, the reversing bottom shell and the outer frame are respectively located on both axial sides of the mounting seat, and the sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

[0043] In one embodiment, a sealing ring is provided on the outer periphery of the sealing portion so as to be sealed and matched with the inner peripheral wall of the reversing bottom shell through the sealing ring.

[0044] In one embodiment, the exoskeleton is provided with a water flow driving member, and the water flow driving member has a driving surface, and the driving surface is arranged at an angle relative to the circumference of the exoskeleton, so that the driving surface can drive the exoskeleton to rotate after being impacted by the water flow.

[0045] In one embodiment, the water flow driving component includes a hanging portion and a driving body, the hanging portion is hung on the end of the exoskeleton close to the water inlet, the driving body is arranged in a conformal manner with the inner circumferential wall of the exoskeleton, the driving body extends along the circumferential arc of the exoskeleton, and has a plurality of water baffles distributed at intervals, and the driving surface is formed on the water baffles.

[0046] In one embodiment, the exoskeleton is installed with a cleaning structure, and the cleaning structure includes an inner cleaning brush protruding from the inner circumference of the exoskeleton, and the inner cleaning brush includes a cleaning part, which extends in the axial direction of the exoskeleton, and the cleaning part is arranged corresponding to the filter element, and the cleaning part is used to clean the filter element.

[0047] In one embodiment, the cleaning portion extends along the circumferential direction of the outer frame and is inclined relative to the axial direction of the outer frame.

[0048] In one embodiment, the cleaning portion is configured as a sheet-like structure.

[0049] In one embodiment, the side portion of the cleaning portion distributed in the axial direction of the outer frame is inclined.

[0050] In one embodiment, a plurality of cleaning parts are distributed in the axial direction of the outer frame, one cleaning part is arranged corresponding to one filter element, and two adjacent cleaning parts are arranged at an acute angle.

[0051] In one embodiment, the inner cleaning brush further comprises a base portion, the base portion is protrudingly disposed on the inner circumference of the outer frame, and the cleaning portion is connected to the outer circumference of the base portion.

[0052] The present invention also provides a water use system, comprising the aforementioned pre-filter.

[0053] In the technical solution of the present invention, the pre-filter is a backwash filter. In the flushing mode and the filtering mode, the flow direction of water flowing through the filtering component is opposite, and the flow direction of the water flow is switched by the reversing member. The technical solution of the present invention can change the connection relationship between different structures through the movement of the reversing member, thereby changing the flow direction of the raw water entering the water inlet and the flow path of the water flow in the water filter cavity, so as to realize the switching of the pre-filter between the filtering mode and the flushing mode, and realize the self-flushing of the internal filtering component of the pre-filter, so that there is no need for manual disassembly and cleaning, which facilitates the cleaning of the pre-filter and thus increases the service life of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 1 A schematic diagram of the external structure of an embodiment of a pre-filter provided by the present invention;

[0056] Figure 2 for Figure 1 Schematic diagram of the internal structure of the valve head;

[0057] Figure 3 A schematic cross-sectional structure diagram of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0058] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0059] Figure 5 for Figure 3 A partial enlarged view of point B in the middle;

[0060] Figure 6 for Figure 3 A partial enlarged view of point C in the middle;

[0061] Figure 7 A schematic cross-sectional structure diagram of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0062] Figure 8 for Figure 7 A partial enlarged view of point D in the middle;

[0063] Fig. 9 for Figure 7 A partial enlarged view of point E in the middle;

[0064] Fig.10 for Figure 7 A partial enlarged view of point F in the middle;

[0065] Fig.11 A schematic structural diagram of an embodiment of a reversing member of a pre-filter provided by the present invention;

[0066] Fig.12 A schematic diagram of the structure of an embodiment of a movable part of a pre-filter provided by the present invention and a schematic diagram of its cross-sectional structure along HH;

[0067] Fig.13 for Fig.12 A schematic diagram of the structure of the moving parts from another perspective;

[0068] Fig.14 A schematic structural diagram of an embodiment of a filter assembly of a pre-filter provided by the present invention;

[0069] Fig.15 for Fig.14 An exploded structural diagram of an embodiment of a filtering module in FIG.

[0070] Fig.16 for Fig.14 A schematic diagram of the connection structure of two filter modules in an embodiment;

[0071] Fig.17 for Fig.14 A schematic diagram of the connection structure of another embodiment of two filter modules;

[0072] Fig.18 A schematic structural diagram of an embodiment of an exoskeleton of a pre-filter provided by the present invention;

[0073] Fig.19 for Fig.18 A schematic diagram of the structure of the exoskeleton from another perspective;

[0074] Fig. 20A schematic structural diagram of an impeller assembly of an embodiment of a pre-filter provided by the present invention;

[0075] Fig.21 for Fig. 20 A schematic diagram of the structure of the impeller assembly from another perspective;

[0076] Fig. 22 for Fig. 20 A schematic structural diagram of an impeller body of an impeller assembly according to an embodiment of the present invention;

[0077] Fig.23 for Fig.18 A schematic cross-sectional view of an embodiment of an exoskeleton;

[0078] Fig.24 A schematic diagram of the coordination state of a cleaning structure of a pre-filter and a filter assembly according to an embodiment of the present invention;

[0079] Fig.25 Schematic diagrams of the cleaning structure of the pre-filter provided by the present invention from different viewing angles;

[0080] Fig.26 A schematic diagram of the cooperation of the reversing member and the filter assembly of the pre-filter provided by the present invention in a filtering mode according to an embodiment;

[0081] Fig. 27 A schematic diagram of the cooperation of the reversing member and the filter assembly of the pre-filter provided by the present invention in a flushing mode according to an embodiment;

[0082] Fig.28 A partial structural cross-sectional view of an embodiment of a pre-filter provided by the present invention;

[0083] Fig.29 A schematic structural diagram of the cleaning structure of the pre-filter provided by the present invention from another perspective;

[0084] Fig.30 A schematic diagram of the assembly structure of a cleaning structure and an outer frame of a pre-filter provided by the present invention.

[0085] Description of Figure Numbers:

[0086] 10. filter bottle; 101. water filter chamber; 102. sewage outlet; 104. first flow outlet;

[0087] 20. Valve head; 21. Metal shell; 22. Plastic lining; 201. Water inlet; 202. Water outlet; 210. Water isolation ring;

[0088] 30. Filter assembly; 300. Filter module; 301. First connection structure; 302. Second connection structure;

[0089] 310, support frame; 311, oblique support portion; 312, first ring portion; 313, second ring portion; 320, filter element; 330, first water outlet; 340, water passage cavity; 350, second water outlet;

[0090] 360, end cover; 361, cylindrical portion; 3611, positioning step; 362, limiting ring portion;

[0091] 40, impeller assembly; 410, mounting seat; 402, first water inlet; 403, second water inlet; 404, drain outlet; 424, water retaining ring;

[0092] 440, impeller body; 441, impeller shaft; 442, impeller blades; 443, second protrusion;

[0093] 50, outer frame; 501, siphon flow channel; 503, first discharge port; 504, second discharge port;

[0094] 511, chassis; 512, side frame; 513, first protrusion; 514, water retaining ring; 531, siphon hole;

[0095] 540, water flow driving member; 541, hanging part; 542, driving body; 543, water baffle; 544, driving surface;

[0096] 60, water distributor; 610, first water flow space; 620, second water flow space; 621, guide vane; 604, blocking part;

[0097] 710, reversing bottom shell; 711, sealing ring surface;

[0098] 720, reversing member; 721, connecting portion; 722, blocking portion; 7221, annular main body; 7222, blocking skirt; 7224, water passing portion; 7225, second connecting hole;

[0099] 723, hollow tube section; 7231, first connecting hole; 7233, first arc section; 7234, second arc section;

[0100] 730, movable part; 731, blocking part; 7311, second flow opening; 732, connecting part;

[0101] 90, cleaning structure; 910, internal cleaning brush; 911, cleaning part; 912, base part; 930, mounting part;

[0102] 1001. Fastener; 1002. Sealing ring; 1003. Elastic member.

[0103] 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

[0104] 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.

[0105] 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.

[0106] 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 parallel 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 contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0107] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, which are used to filter large particles of tap water. This not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves the health of residents. The pre-filter is the first coarse filtration device in the whole-house water purification system. It is a physical filtration device used to protect the safety of back-end water use.

[0108] The present invention proposes a pre-filter, which has a filtering mode and a flushing mode. In the filtering mode, the pre-filter can filter large particles before using the water end. In the flushing mode, the pre-filter can clean the filtering components inside it to discharge the large particles previously intercepted, thereby eliminating the need to manually disassemble and clean the pre-filter, thereby increasing the service life of the pre-filter.

[0109] See also Figures 1 to 3In one embodiment of the present invention, the pre-filter includes a valve head 20 and a filter bottle 10, the filter bottle 10 is formed with a water filter chamber 101, the valve head 20 is provided with a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, and the filter bottle 10 is provided with a sewage outlet 102 on the side away from the valve head 20.

[0110] The water inlet 201 is connected to the water supply end of the water use system, and the water outlet 202 is connected to the water use end of the water use system, thereby filtering the raw water flowing from the water supply end to the water use end. It should be noted that the water supply end can be a water pipe, a water tower or a well water, and the water use end can be a faucet, a shower or a drinking water outlet, and this application does not make specific limitations on this.

[0111] The connection between the valve head 20 and the filter bottle 10 can be threaded connection. For example, the valve head 20 is provided with an external threaded tube, and the mouth of the filter bottle 10 is provided with an internal thread for threading the external threaded tube. In order to reduce the production difficulty of the pre-filter and the inspection requirements of the assembly results, and to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001. The fastener 1001 can be a bolt, and the locking of the filter bottle 10 and the valve head 20 is achieved through the threaded cooperation between the bolt and the through hole; the fastener 1001 can also be a bolt and a nut assembly, and the bolt is locked with the nut after passing through the through hole; the fastener 1001 can also be a pin and a pin assembly, and the pin is passed through the through hole, and the pin is passed through the pin through the pin, so as to achieve the locking of the filter bottle 10 and the valve head 20.

[0112] The valve head 20 includes a metal shell part 21 and a plastic lining part 22 connected to each other, and the water inlet 201 and the water outlet 202 are both formed on the plastic lining part 22. The metal shell part 21 of the valve head 20 and the filter bottle 10 are connected by a fastener 1001. In this way, the water flowing through the pre-filter directly contacts the plastic lining part 22 instead of the metal shell part 21, which can avoid the problem of water being contaminated by metal elements precipitated from the metal shell part 21, and can also make the pre-filter have good aesthetics and shell strength. In other embodiments, the valve head 20 can also be directly configured as a metal part.

[0113] The materials of the metal shell portion 21 and the plastic lining portion 22 are not specifically limited in this application. For example, the material of the metal shell portion 21 can be a copper alloy, such as brass, and the material of the plastic lining portion 22 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0114] The pre-filter also includes a filter assembly 30 disposed in the water filter chamber 101. After the raw water (such as tap water or well water) flows into the water inlet 201 from the external water source, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, and play a good protective function for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to clogging by impurities. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter or a PP cotton filter to filter impurities.

[0115] The pre-filter is usually a "T"-shaped structure. The "horizontal" position on the top corresponds to the valve head 20, and the left and right ends are the water inlet 201 and the water outlet 202 respectively. The main body of the "vertical" position on the bottom is the filter bottle 10, and the sewage outlet 102 is located on the lower side of the filter bottle 10.

[0116] In one embodiment, if Figures 14 to 17 As shown, the filter assembly 30 includes a filter module 300, and a water passage cavity 340 is formed inside the filter module 300. The filter module 300 is provided with a first water passage 330 in the axial direction thereof and connected to the water passage cavity 340. The filter module 300 is provided with a second water passage 350 in the circumferential direction thereof and connected to the water passage cavity 340. The filter module 300 includes a filter element 320 arranged at the second water passage 350, and the filter element 320 is at least partially arranged to be inclined. It can be understood that in the filtering mode, the raw water will enter the water passage chamber 340 through the second water passage 350 on the peripheral side of the filter module 300, so that the impurities in the raw water can be filtered by the filter element 320, and finally the clean water flows from the first water passage 330 on the axial side of the filter module 300 to the water outlet 202. Since the filter element 320 is at least partially inclined, the filtering area of ​​the filter element 320 can be increased at the same axial height, which means that at the same flow rate, the filter element 320 of this scheme can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filtering area of ​​the filter element 320 of this scheme is large enough, even if a local area of ​​the filter element 320 is blocked, 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.

[0117] It can be understood that in the filtering flow path of the pre-filter, the second water port 350, the water cavity 340 and the first water port 330 are sequentially distributed along the upstream and downstream. That is, when the pre-filter is in the filtering mode, the water flow entering from the water inlet 201 will flow to the water outlet 202 through the second water port 350, the water cavity 340 and the first water port 330 in sequence, that is, the water flow will flow from the outside of the filter module 300 to the inside of the filter module 300; and when the pre-filter is in the flushing mode, since the pre-filter is a backwashing type, the flow direction of the water flow will change for the filter module 300, and the water flow will flow from the inside of the filter module 300 to the outside of the filter module 300, that is, the water flow will flow from the inside of the filter cavity 340 through the second water port 350 to the filter cavity 101 on the outer peripheral side of the filter module.

[0118] Without loss of generality, the filter element 320 is annular and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one side of the inner ring edge in the axial direction, that is, the inner ring edge and the outer ring edge are not at the same height in the axial direction, so that the filter element 320 maintains an inclined shape in the circumferential direction. In this way, the filtering area of ​​the filter element 320 can be further increased, so as to further increase the flow load that the filter element 320 can withstand and improve the filtering efficiency.

[0119] In one embodiment, if Fig.14 As shown, the filter assembly 30 includes a plurality of filter modules 300. The provision of a plurality of filter modules 300 improves the modularity of the filter assembly 30, and 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 assembly 30, thereby solving the problem of sharing the filter assembly 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 assembly 30 can also be adjusted, so that a suitable filtration area can be set, thereby achieving the effect of improving the filtration effect.

[0120] Furthermore, the outer side surface of the filter element 320 is set in a conical surface. The design of the conical surface is conducive to the uniform distribution and smooth flow of the fluid, reduces the eddy current and turbulence of the fluid inside the filter module 300, and reduces energy loss. Specifically, the generatrix of the conical surface can be a straight line, or the generatrix of the conical surface can also be a concave arc line that is concave toward the inside of the water cavity 340, or the generatrix of the conical surface can also be a convex arc line that protrudes out of the water cavity 340. In other embodiments, the outer side surface of the filter element 320 can also be a pyramidal surface, and the cross-section of the pyramidal surface is a polygon, so that the filtering area of ​​the filter element 320 can be increased.

[0121] In one embodiment, if Fig.14As shown, the filter assembly 30 further includes a water distributor 60 , which is axially connected to the filter module 300 . Specifically, when multiple filter modules 300 are provided, the water distributor 60 is connected to a filter module 300 that is closer to the valve head 20 .

[0122] In one embodiment, if Fig.16 and Fig.17 As shown, the first connection structure 301 and the second connection structure 302 are respectively provided on both axial sides of the filter module 300, and the first connection structure 301 of one filter module 300 is used to be detachably connected with the second connection structure 302 of another filter module 300, so that the two filter modules 300 are fixed to each other, and at least one of the first connection structure 301 and the second connection structure 302 can be detachably connected with the water distributor 60. That is, the structure of detachable connection between the two filter modules 300 is also used for detachable connection with the water distributor 60, so that the modularization degree of the filter assembly 30 can be improved, and the assembly between the various structures of the filter assembly 30 is convenient.

[0123] Among them, it can be, for example Fig.17 As shown, one of the first connection structure 301 and the second connection structure 302 is configured as a convex, and the other is configured as a slot. The water distributor 60 is correspondingly configured with a convex or a slot. Of course, it can also be, for example Fig.16 As shown, one of the first connection structure 301 and the second connection structure 302 is configured as a hook, and the other is configured as a hook groove, and the water distributor 60 is correspondingly configured with a hook or a hook groove.

[0124] Specifically, the filter module 300 may be provided with a latching protrusion on a side close to the water distributor 60 and a latching groove on a side away from the water distributor 60, and the water distributor 60 may be provided with a latching groove on a side close to the filter module 300. In this way, the water distributor 60 and the filter module 300 as well as two adjacent filter modules 300 may be detachably connected through the cooperation of the latching protrusion and the latching groove, and the same is true for the cooperation of the hook groove and the latching hook.

[0125] In one embodiment, if Fig.15As shown, the filter module 300 includes two support frames 310 distributed along the axial direction, the water passage cavity 340 is formed between the two support frames 310, each support frame 310 is provided with the filter element 320, and the inner ring edge and the outer ring edge of the two adjacent filter elements 320 are distributed in opposite directions. It can be understood that when the radial space in the water filter cavity 101 is constant, compared with the filter module 300 that maintains a tapered shape in one direction, the two filter elements 320 of the same filter module 300 are tapered in opposite directions, which can obtain a larger filtering area. In this way, the present embodiment can make full use of the space in the water filter cavity 101, and form a larger filtering area on the peripheral side of the filter module 300 to ensure that the filter assembly 30 can withstand a larger flow load and improve the filtering efficiency. At the same time, a sufficiently large water passage cavity 340 can be formed in the two support frames 310 to facilitate the flow of water. Of course, in other embodiments, a filter module 300 may also include only one support frame 310 , and the first water outlet 330 , the second water outlet 350 and the water passage cavity 340 are formed on the same support frame 310 .

[0126] In one embodiment, if Figures 15 to 17 As shown, the support frame 310 includes an oblique support portion 311, and the two ends of the oblique support portion 311 are respectively connected with a first ring portion 312 and a second ring portion 313, and the two oblique support portions 311 of the same filter module 300 are connected through the second ring portion 313, and the inner periphery of the first ring portion 312 is provided with the first water outlet 330, and the second water outlet 350 is provided at the oblique support portion 311. In this way, the structural strength of the support frame 310 can be guaranteed, and the connection strength between the two support frames 310 can be guaranteed, so as to ensure the filtering capacity of the filter assembly 30. Of course, in other embodiments, the support frame 310 can also be set to other structural forms.

[0127] Specifically, the inclined support portion 311 includes a plurality of ribs spaced apart along the circumferential direction to form a plurality of second water outlets 350 spaced apart along the circumferential direction. The filter element 320 is stacked on the inclined support portion 311. In this way, the filter element 320 can be provided with sufficient support by the inclined support portion 311. In addition, the total flow area of ​​the second water outlet 350 is relatively large, so that the filter module 300 has sufficient flow capacity.

[0128] Without loss of generality, the outer diameter of the second ring portion 313 is greater than the outer diameter of the first ring portion 312, so that each filter element 320 will be alternately tapered in the upper and lower directions, which can make fuller use of the space in the water filter cavity 101 to provide a larger filtering area, thereby further improving the filtering efficiency of the filter assembly 30. Of course, in other embodiments, the outer diameter of the first ring portion 312 may be greater than the outer diameter of the second ring portion 313, or there may be no definite size relationship between the diameters of the first ring portion 312 and the second ring portion 313.

[0129] In one embodiment, each of the support skeletons 310 is provided with the second ring portion 313, and the two second ring portions 313 of the same filter module 300 are detachably connected. 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 module 300 to be operated quickly and effectively when the support skeleton 310 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 module 300 maintains and replaces the support skeleton 310. Moreover, the detachable connection allows the fast replacement of the faulty support skeleton 310, thereby reducing the water outage time 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.

[0130] Further, in some possible connection modes, the two second ring portions 313 are snap-fitted. It can be understood that when the second ring portion 313 is made of plastic or metal, the snap-fit ​​structure can be directly formed on the second ring portion 313, and no additional locking accessories, such as screws, nuts, etc., are required during assembly, thereby reducing manufacturing costs and assembly costs. Moreover, since the snap-fit ​​structure is flexible in design, it can be customized according to the actual needs of the second ring portion 313, 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. Specifically, the snap-fit ​​structure can be a combination of a hook and a hook groove, or a combination of a convex and a groove. Of course, in other embodiments, the two second ring portions 313 may be threadedly connected. Through the tight engagement of the threads, the connection between the two second ring portions 313 has higher tensile and compressive strengths, which can meet the use requirements under various working conditions. After assembly, the connection portion 732 is not easy to loosen and can maintain a stable connection state, thereby ensuring the normal operation of the filter module 300.

[0131] Optionally, in the same filter module 300, the end faces of the two second ring portions 313 abut against each other; it can be understood that in the same filter module 300, the two support skeletons 310 are connected by the two second ring portions 313, and the water passage cavity 340 is formed between the two support skeletons 310. By abutting the end faces of the two second ring portions 313, the two support skeletons 310 can be connected and the water passage cavity 340 can be sealed at the same time, which is beneficial to saving processing steps and improving production efficiency.

[0132] In one embodiment, the first ring portions 312 of two adjacent filter modules 300 are detachably connected, and the specific method of the detachable connection of the two first ring portions 312 can refer to the connection method of the two second ring portions 313, and the connection method between the water distributor 60 and the filter module 300 can also refer to the connection method between the two second ring portions 313. In this way, modular assembly between different filter modules 300 can be facilitated. Furthermore, the end faces of the first ring portions 312 of the two adjacent filter modules 300 are abutted against each other, so that the first water outlets 330 of the two adjacent filter modules 300 can be connected while the connection of the two adjacent filter modules 300 is achieved, which is conducive to saving processing steps and improving production efficiency.

[0133] In one embodiment, please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 The pre-filter also includes a reversing member 720, which is hollow. The inner circumference of the reversing member 720 is connected to the water outlet 202 and the water filter chamber 101. The reversing member 720 includes a connecting portion 721 and a blocking portion 722. The reversing member 720 can be movably inserted into the filter assembly 30 so that the pre-filter can switch between a filtering mode and a flushing mode. The flushing flow path between the water inlet 201 and the reversing member 720 is connected through the connecting portion 721 and is cut off through the blocking portion 722.

[0134] In the technical solution of the present invention, the pre-filter is a backwash filter. In the flushing mode and the filtering mode, the flow direction of the water flowing through the filter assembly 30 is opposite, and the flow direction of the water flow is switched by the reversing member 720. This solution can change the connection relationship between different structures through the movement of the reversing member 720, thereby changing the flow direction of the raw water entering the water inlet 201 and the water flow path in the filter chamber 101, so as to realize the switching of the pre-filter between the filtering mode and the flushing mode, and realize the self-flushing of the internal filter assembly 30 of the pre-filter, so as to avoid manual disassembly and cleaning, facilitate the cleaning of the pre-filter, and thus improve the service life of the pre-filter. Among them, the connecting portion 721 and the blocking portion 722 are integrally formed on the reversing member 720, so as to facilitate the assembly of the reversing member 720, ensure the overall strength of the reversing member 720, and avoid the installation gap between the connecting portion 721 and the blocking portion 722, thereby causing the reversing member 720 to accidentally seep water, resulting in the possibility of water flow turbulence.

[0135] For more details, please refer to Figure 3 , Figure 4 , Figure 7 , Figure 8 and Fig.14 The water distributor 60 has a first water passage space 610 corresponding to the first water passage 330 and a second water passage space 620 corresponding to the second water passage 350. The second water passage space 620 is provided with a guide vane 621. The reversing member 720 extends into the water passage chamber 340 through the first water passage space 610. That is, the filtration flow path between the water inlet 201 and the outer peripheral side of the filter module 300 can be communicated through the second water passage space 620, the blocking part 722 can block the filtration flow path by covering the second water passage space 620, and the filtration flow path between the inner peripheral side of the filter module 300 and the water outlet 202 can be communicated through the first water passage space 610. In addition, the water flows into the water filter chamber 101 through the second water passage space 620, which can form a vortex to disturb the water flow and prevent the deposition of impurities.

[0136] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8The valve head 20 is provided with a water-isolating ring 210 between the water inlet 201 and the water outlet 202, the water inlet 201 is connected to the outer peripheral side of the water-isolating ring 210, the water outlet 202 is connected to the inner peripheral side of the water-isolating ring 210, and the reversing member 720 is inserted in the water-isolating ring 210 and the filter assembly 30 axially movably. It can be understood that the water-isolating ring 210 and the filter assembly 30 are arranged opposite to each other in the axial direction, and one end of the reversing member 720 is plugged and matched with the water-isolating ring 210, wherein the reversing member 720 can be sleeved outside the water-isolating ring 210, or the water-isolating ring 210 can be sleeved outside the reversing member 720, and the other end of the reversing member 720 extends into the water-passing cavity 340 through the first water-passing space 610. In this way, the reversing member 720 can stably switch between different positions corresponding to the filtering mode and the flushing mode under the restriction of the water-isolating ring 210 and the filter assembly 30. Of course, in other embodiments, the reversing member 720 or other components may be provided with a corresponding water-isolating structure, which cooperates with the valve head 20 to play the role of the water-isolating ring 210 in this embodiment.

[0137] Please also read Figure 3 and Figure 4 When the reversing member 720 is driven to a position corresponding to the filtering mode, the position of the blocking portion 722 can avoid the filtering flow path between the water inlet 201 and the second water flow space 620, and cut off the flushing flow path between the water inlet 201 and the inner circumference of the reversing member 720, so that the filtering flow path from the water inlet 201 to the water filter chamber 101 through the second water flow space 620 is connected. At this time, since the sewage outlet 102 is closed and the water outlet 202 is opened, after the raw water enters from the water inlet 201, it can directly flow through the second water flow space 620 to the filter assembly 30 for filtration, and flow from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water, and the filtered water flows to the water outlet 202 through the inner circumference of the reversing member 720.

[0138] Please also read Figure 7 and Figure 8 When the reversing member 720 is driven to a position corresponding to the flushing mode, the position of the blocking portion 722 can separate the water inlet 201 and the second water flow space 620 to separate the filtering flow path between the water inlet 201 and the water filter chamber 101, and the position of the connecting portion 721 can provide the water inlet 201 to connect to the inner circumference of the reversing member 720 to conduct the flushing flow path from the water inlet 201 to the water filter chamber 101 through the inner circumference of the reversing member 720. At this time, since the sewage outlet 102 is opened and the water outlet 202 is closed, the raw water enters from the water inlet 201, enters the inner circumference of the reversing member 720 through the connecting portion 721, and then flows to the filter assembly 30 to flush the filter assembly 30, and finally is discharged from the sewage outlet 102.

[0139] Among them, the connecting part 721 and the blocking part 722 are integrally formed on the switching part 720, which not only facilitates the assembly of the switching part 720, but also ensures the overall strength of the switching part 720, and avoids the possibility of an installation gap between the connecting part 721 and the blocking part 722, which may cause accidental water seepage into the switching part 720 and cause water flow turbulence.

[0140] In one embodiment, the water-isolating ring 210 and the water distributor 60 are jointly constructed to form a water-passing structure, and the water-passing structure is connected to the water inlet 201; on the adjacent side of the water distributor 60 and the water-isolating ring 210, the water-passing structure is separated from the connecting portion 721 in the filtering mode, and is connected to the connecting portion 721 in the flushing mode.

[0141] In this embodiment, the water-passing structure is formed by the water-isolating ring 210 and the water distributor 60. The reversing member 720 switches between different positions, and can change the relative positions between the blocking portion 722 and the connecting portion 721 and the water-passing structure, thereby controlling the connection and disconnection between the water-passing structure and the corresponding space, so that the corresponding flow path is connected and the corresponding flow path is blocked. Of course, in other embodiments, the water-passing structure can also be formed only on the water-isolating ring 210.

[0142] In one embodiment, please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 , the water isolating ring 210 and the water distributor 60 are spaced apart, the water passing structure is the space between the water isolating ring 210 and the water distributor 60, and the connecting portion 721 and the blocking portion 722 are distributed along the axial direction;

[0143] In the filtering mode, the blocking portion 722 is at least located between the water isolation ring 210 and the water distributor 60, so that the water inlet 201 is connected to the second water passage space 620;

[0144] In the flushing mode, the connecting portion 721 is at least partially located between the water isolation ring 210 and the water distributor 60 , so that the connecting portion 721 is connected to the water inlet 201 , and the blocking portion 722 blocks the second water flow space 620 .

[0145] In this embodiment, the water passing structure is configured as the interval between the water isolation ring 210 and the water distributor 60, the connecting portion 721 and the blocking portion 722 are distributed along the axial direction, and the reversing member 720 is axially movable relative to the filter bottle 10. In different modes, the reversing member 720 moves axially to respectively set the connecting portion 721 and the blocking portion 722 relative to the interval between the water isolation ring 210 and the water distributor 60.

[0146] When the blocking portion 722 is arranged relative to the interval between the water blocking ring 210 and the water distributor 60, the blocking portion 722 is at least located between the water blocking ring 210 and the water distributor 60, and the interval at this location is divided into two parts by the blocking portion 722, one part is located on the outer peripheral side of the reversing member 720, and the other part is located on the outer peripheral side of the reversing member 720. The two parts are not directly connected here, and the following filtration flow path is formed: raw water flows from the water inlet 201 through the second water flow space 620 to the water filter chamber 101, and in the water filter chamber 101, flows from the outer peripheral side of the filter assembly 30 to the inner peripheral side of the filter assembly 30, and then flows from the outer peripheral side of the reversing member 720 to the inner peripheral side of the reversing member 720, and finally flows to the water outlet 202.

[0147] When the connecting portion 721 is arranged relative to the interval between the water-isolating ring 210 and the water distributor 60, the connecting portion 721 is at least partially located between the water-isolating ring 210 and the water distributor 60. In this way, at the interval, the outer peripheral side of the reversing member 720 can be connected to the inner peripheral side of the reversing member 720 through the connecting portion 721. Since the blocking portion 722 blocks the second water flow space 620, the raw water flows from the water inlet 201 through the connecting portion 721 to the inner periphery of the reversing member 720, and then at the position corresponding to the filter assembly 30, it flows from the inner periphery of the reversing member 720 through the filter assembly 30 to the water filter chamber 101 on the outer peripheral side of the filter assembly 30, thereby flushing the filter assembly 30, and finally flows to the sewage outlet 102.

[0148] Among them, the direction from the connecting part 721 to the blocking part 722 can be the direction from the water isolation ring 210 to the water distributor 60, or it can be that the blocking part 722 includes two parts that block the second water flow space 620 and the gap between the water isolation ring 210 and the water distributor 60, and the two parts are respectively located on both sides of the axial direction of the connecting part 721, and the part that blocks the second water flow space 620 is on the side of the water distributor 60 away from the water isolation ring 210.

[0149] In other embodiments, the water passing structure can be configured as a through hole. In one embodiment, the water isolating ring 210 and the water distributor 60 are integrally formed, and the water passing structure can be configured as a through hole provided in the water isolating ring 210 and the water distributor 60; in another embodiment, the water isolating ring 210 and the water distributor 60 are separately formed, and the water isolating ring 210 and the water distributor 60 are abutted and assembled to form a through hole.

[0150] And when the water passing structure is configured as a through hole, the connecting portion 721 and the blocking portion 722 can be distributed along the circumference of the reversing member 720, that is, the connection relationship between different structures is changed by the rotation of the reversing member 720 relative to the water distributor 60 and the water blocking ring 210 to realize the switching of the filtering mode and the flushing mode. At this time, in the filtering mode, the through hole and the connecting portion 721 are circumferentially misaligned. Of course, the connecting portion 721 and the blocking portion 722 can also be distributed along the axial direction of the reversing member 720, that is, the reversing member 720 realizes the switching of the filtering mode and the flushing mode through axial movement. At this time, in the filtering mode, the through hole and the connecting portion 721 are axially misaligned.

[0151] In one embodiment, the water distributor 60 and the water-isolating ring 210 are axially opposed and spaced apart. In the filtering mode, the axial sides of the blocking portion 722 are respectively connected to the water distributor 60 and the water-isolating ring 210, and are respectively connected to the first water flow space 610 and the inner circumference of the water-isolating ring 210, and are spaced apart from the second water flow space 620. In the flushing mode, the connecting portion 721 is at least partially located between the water distributor 60 and the water-isolating ring 210, and the blocking portion 722 covers the second water flow space 620. In this way, in the filtering mode, the water inlet 201 and the inner circumference of the reversing member 720 can be separated by the blocking portion 722 on the adjacent side of the water distributor 60 and the water isolation ring 210, and the water inlet 201 will also be connected to the water filter chamber 101 through the second water flow space 620 on this side. In the flushing mode, the water inlet 201 and the inner circumference of the reversing member 720 can be connected through the connecting portion 721 on the adjacent side of the water distributor 60 and the water isolation ring 210.

[0152] Specifically, the baffle portion 722 includes an annular main body 7221 extending along the axial direction of the reversing member 720, and a baffle skirt 7222 arranged around the outer periphery of the annular main body 7221. The annular main body 7221 is connected to the connecting portion 721 and is slidably connected to the water distributor 60. The baffle skirt 7222 is located between the water distributor 60 and the water isolation ring 210. In the flushing mode, the baffle skirt 7222 abuts against the water distributor 60 at the outer periphery of the water flow space to cover the second water flow space 620. In the filtering mode, there is a gap between the baffle skirt 7222 and the water distributor 60, that is, it is spaced from the second water flow space 620, and the outer periphery of the baffle skirt 7222 and the inner periphery of the filter bottle 10 are matched with each other, so that the water inlet 201 can be connected to the second water flow space 620 through the above gap.

[0153] In one embodiment, a filtering structure is provided around the circumference of the connecting portion 721. Specifically, the peripheral wall of the connecting portion 721 has a porous structure that can be connected to the water inlet 201, so that in the flushing mode, the raw water flowing into the water filter chamber 101 from the water inlet 201 can pass through, so as to pass the raw water into the inner periphery of the filter assembly 30, and clean the filter assembly 30 from the inside to the outside. However, there may be impurities inside the raw water. If it is not filtered, the impurities in the raw water may be filtered and stored in the inner periphery of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 is converted from the flushing mode to the filtering mode, the impurities in the inner periphery flow out of the water outlet 202 together with the filtered raw water, resulting in a poor initial filtering effect. Therefore, a filtering structure is also provided around the connecting portion 721, and the filtering structure is often configured as a filter net, which is fixed to the inner side or outer side of the porous structure, or integrally formed on the connecting portion 721. Among them, the filter net can be bonded to the connecting portion 721. In other embodiments, the filtering structure may also be directly disposed on the periphery of the water-isolating ring 210 by other fixed structures, so that the raw water flowing out of the water inlet 201 is filtered by the filtering structure and then flows to the connecting portion 721 .

[0154] In one embodiment, please refer to Figure 3 , Figure 7 and Fig.11 , the reversing member 720 further includes a hollow pipe section 723, the connecting portion 721, the blocking portion 722 and the hollow pipe section 723 are sequentially distributed along the axial direction, the connecting portion 721 is plugged and matched with the water isolation ring 210, the blocking portion 722 is plugged and matched with the water distributor 60, and the hollow pipe section 723 extends into the filter module 300. It can be understood that the axis of the hollow pipe section 723 is parallel to or even coincides with the axis of the filter bottle 10, and the peripheral wall of the hollow pipe section 723 is provided with a through hole connected to the water filter cavity 101. In the flushing mode, the water flow entering the reversing member 720 from the connecting portion 721 can be guided to the inner periphery of the filter assembly 30 via the hollow pipe section 723.

[0155] In the filtering mode, raw water enters the filter chamber 101 from the water inlet 201, flows to the filter assembly 30 through the second water flow space 620 of the water distributor 60, and flows from the outside to the inside along the radial direction of the filter assembly 30, thereby filtering the raw water. After the filtered raw water enters the inner circumference of the filter assembly 30, it can enter the hollow pipe section 723, and then flow upward to the water outlet 202 under the action of water pressure; in the flushing mode, raw water enters the filter chamber 101 from the water inlet 201, enters the inner circumference of the reversing member 720 through the connecting portion 721, and continues to flow downward to the hollow pipe section 723, and then sprays toward the filter assembly 30, so that the cleaning water flow is sprayed from the outside to the inside along the radial direction of the filter assembly 30 to take away impurities on the filter assembly 30, thereby achieving the purpose of flushing the filter assembly 30, and then flows out from the sewage outlet 102.

[0156] In one embodiment, please refer to Figure 3 , Figure 6 , Figure 7 and Fig.10 The filter assembly 30 also includes an end cover 360, which includes a cylindrical portion 361 and a limiting ring portion 362 arranged around the cylindrical portion 361, the limiting ring portion 362 is connected to the side of the filter module 300 away from the water distributor 60, the cylindrical portion 361 is inserted into the water passage chamber 340, and the outer periphery of the hollow pipe section 723 and the inner periphery of the cylindrical portion 361 are sealed and matched. Specifically, the hollow tube section 723 and the cylindrical portion 361 are sealed together by the sealing ring 1002, and the hollow tube section 723 extends into the inner circumference of the cylindrical portion 361. The connecting portion 732 of the movable part 730 described later also extends into the inner circumference of the cylindrical portion 361 and is connected to the hollow tube section 723. In this way, the connection between the hollow tube section 723 and the movable part 730 can be avoided by the cylindrical portion 361. At the same time, the cylindrical portion 361 can play a certain guiding role in the movement of the hollow tube section 723 and the movable part 730. On this basis, due to the sealed cooperation between the hollow tube section 723 and the cylindrical portion 361, the water flow will not leak at the connection between the hollow tube section 723 and the cylindrical portion 361. The water flow in the water flow chamber 340 and the water filter chamber 101 needs to pass through the second water flow port 350, that is, it needs to pass through the filter element 320, thereby ensuring the filtering effect of the pre-filter. Of course, in other embodiments, the filter module 300 away from the water distributor 60 may be sealed and matched with the inner circumference of the first ring portion 312 and the hollow pipe section 723 .

[0157] Furthermore, a positioning step 3611 is provided on the inner circumference of the cylindrical portion 361. When the switching member 720 moves to a position corresponding to the filtering mode, the end face of the hollow tube section 723 abuts against the positioning step 3611, thereby providing a positioning function for the movement of the switching member 720, while also maintaining the switching member 720 to be able to stably switch to this position.

[0158] In one embodiment, please refer to Figure 3 , Figure 7 , Fig.18 and Fig.19, the pre-filter also includes an exoskeleton 50, and the exoskeleton 50 is rotatably mounted on the outside of the filter assembly 30. In this way, the exoskeleton 50 can be rotated to disturb the water flow in the water filter chamber 101, thereby preventing impurities from being deposited and attached to the filter assembly 30, the exoskeleton 50 and the side walls of the water filter chamber 101, reducing the possibility of clogging of the filter assembly 30, thereby ensuring the filtering effect of the filter assembly 30. In this embodiment, the exoskeleton 50 includes a side frame 512 and a chassis 511, and the chassis 511 is connected to the side frame 512 and is located on a side away from the valve head 20, with strong structural stability and high rotation stability. Of course, in other embodiments, the exoskeleton 50 may also include only the side frame 512 structure.

[0159] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.18 , Fig.19 and Fig.28 The outer frame 50 is formed with a siphon channel 501, the side frame 512 is provided with a siphon hole 531 connected to the siphon channel 501, and the bottom plate 511 is provided with a first discharge port 503 connected to the siphon channel 501, and the first discharge port 503 is connected to the sewage outlet 102 at least in the flushing mode. The technical solution of the present invention is to set the siphon channel 501 and the 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 be more efficiently discharged to the sewage outlet 102 through the first discharge port 503. That is, the impurities, particles, etc. intercepted by the filter assembly 30 can be more effectively guided to the sewage outlet 102 in the flushing mode, and finally discharged through the sewage outlet 102, thereby improving the flushing effect of the water filter cavity 101, especially the filter assembly 30.

[0160] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Figures 18 to 21 An impeller assembly 40 is also provided in the water filter chamber 101, and the impeller assembly 40 includes a mounting seat 410 and an impeller body 440 rotatably mounted on the mounting seat 410, and the mounting seat 410 is formed with a water inlet and a drain port 404, and the water inlet includes a first water inlet 402. At least in the flushing mode, the first discharge port 503 is connected to the sewage outlet 102 via the first water inlet 402 and the drain port 404 in sequence.

[0161] During the flushing stage of the pre-filter, that is, when the drain valve is opened, water flows into the pre-filter through the water inlet 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 and the drain port 102, thereby 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.

[0162] 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.

[0163] By arranging the impeller assembly 40 in the sewage system and using the water flow power to drive the impeller body 440 to rotate, not only can the flushing force and stirring effect of the water flow be enhanced, but also the sewage discharge efficiency and cleanliness can be improved. 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 the overall operating cost and reduce the waste of water resources.

[0164] Furthermore, the outer frame 50 is transmission-connected to the impeller body 440 , so that the impeller body 440 can rotate in the same direction as the outer frame 50 during the flushing stage and provide additional rotational driving force to the outer frame 50 .

[0165] There are many structural forms for realizing the transmission connection between the exoskeleton 50 and the impeller body 440. For example, the impeller body 440 is coaxially connected to the exoskeleton 50 and fixed in the circumferential direction, that is, the impeller body 440 is fixed to the rotation axis of the exoskeleton 50 in the circumferential direction. Specifically, the exoskeleton 50 may have a plurality of first protrusions 513 distributed along the circumference on one side of the mounting seat 410, and a plurality of second protrusions 443 are provided on one end of the impeller shaft 441 close to the exoskeleton 50. The plurality of second protrusions 443 are distributed along the circumference of the impeller shaft 441, and a first protrusion 513 is clamped between two adjacent second protrusions 443. Without loss of generality, the connecting portion 732 of the movable member 730 is penetrated through the mounting seat 410, the impeller body 440 and the exoskeleton 50, and the first protrusion 513 and the second protrusion 443 are matched on the outer circumference of the movable member 730. In this way, the rotation of the outer frame 50 and the rotation of the impeller body 440 can promote each other to ensure the turbulent effect of the outer frame 50 and the impeller body 440, thereby avoiding the deposition of impurities.

[0166] See also Fig.19 It is worth mentioning that the first discharge port 503 is set at an oblique angle, which can make the water flow obliquely enter the mounting seat 410, thereby improving the rotation efficiency of the impeller body 440.

[0167] In one embodiment, if Fig. 20 As shown, the water inlet also includes a second water inlet 403, the first water inlet 402 is arranged on one axial side of the mounting seat 410, and the second water inlet 403 is arranged on the circumferential side of the mounting seat 410. Correspondingly, the impeller body 440 includes an impeller shaft 441 and a plurality of impeller blades 442 obliquely arranged on the impeller shaft 441, and the water flows from the first water inlet 402 and the second water inlet 403 can both cause the impeller blades 442 to drive the impeller shaft 441 to rotate. In this way, the water flow path and flow rate entering the mounting seat 410 are increased through the first water inlet 402 and the second water inlet 403, and the provision of multiple water inlets can form a more complex flow pattern of water flow in the impeller chamber, providing sufficient power for the rotation of the impeller body 440.

[0168] See also Fig.21 Specifically, optionally, the impeller body 440 includes an impeller shaft 441 and a plurality of inclined impeller blades 442, one side of the impeller blade 442 is curved 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 impeller 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.

[0169] Sewage enters the impeller chamber 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. 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 impeller blade 442 design, thereby improving the sewage discharge efficiency and cleanliness. The drain outlet 404 is set at the bottom or side of the mounting seat 410 (usually opposite to the sewage outlet 102) to facilitate the discharge of sewage.

[0170] In one embodiment, the chassis 511 is also provided with a second discharge port 504 extending axially therethrough, and a water retaining structure is formed on opposite sides of the exoskeleton 50 and the mounting seat 410, the water retaining structure being arranged around the first discharge port 503, and the second discharge port 504 is located on the outer periphery of the water retaining structure for being connected to the second water inlet 403.

[0171] For more details, please refer to Fig.19 and Fig. 20 The bottom of the outer frame 50 is provided with a water retaining ring 514, and the mounting seat 410 is provided with a water retaining ring 424. The water retaining ring 514 and the water retaining ring 424 cooperate to form a water retaining structure. The siphon flow channel 501 and the first water inlet 402 are connected at the inner periphery of the water retaining structure, and the filter water cavity 101 at the outer periphery of the filter assembly 30 is connected to the second water inlet 403 at the outer periphery of the water retaining structure through the second discharge port 504. Further, the mounting seat 410 is provided with second water inlets 403 on both opposite sides. When draining, the water in the filter bottle 10 other than the siphon flow channel 501 can enter from these two second water inlets 403. Four first water inlets 402 inclined in the same direction are designed on the mounting seat 410, and the water flowing out of the siphon flow channel 501 enters the impeller cavity through the first water inlet 402.

[0172] In one embodiment, the blocking portion 731 is located on a side of the exoskeleton 50 away from the valve head 20, and the blocking portion 731 can detachably block at least one of the water inlet and the drain outlet 404; in the filtering mode, the blocking portion 731 blocks at least one of the water inlet and the drain outlet 404; in the flushing mode, the water inlet and the drain outlet 404 are both open.

[0173] In this embodiment, at least one of the drain port 404 and the water inlet is the first flow port 104, and the plugging portion 731 is further provided with a second flow port 7311, and the first flow port and the second flow port 7311 are staggered, without loss of generality, and the second flow port 7311 axially penetrates the plugging portion 731. Of course, in other embodiments, the plugging portion 731 may not be provided with a flow port, or the first flow port may be formed by other structures in the filter bottle 10, and even the sewage outlet 102 may be used as the first flow port for the plugging portion 731 to detachably plug.

[0174] The blocking portion 731 may be located on the inner side of the mounting seat 410. In this case, in the flushing mode, the water flowing into the mounting seat 410 from the water inlet will first pass through the second flow opening 7311 on the blocking portion 731, and then flow out of the mounting seat 410 through the drain 404. The mounting seat 410 may also be located on the outer side of the mounting seat 410. In this case, the second flow opening 7311 may be located upstream of the water inlet, or downstream of the drain 404. In addition, the blocking portion 731 may be provided corresponding to one of the water inlet and the drain 404 to detachably block one of the water inlet and the drain 404, or may be capable of simultaneously blocking the water inlet and the drain 404, and can move relative to the mounting seat 410 to a position where the water inlet and the drain 404 are simultaneously opened.

[0175] When the blocking portion 731 blocks the first flow port 104 through the solid structure around the second flow port 7311, the solid structure around the first flow port 104 on the mounting seat 410 can block the second flow port 7311, thereby isolating the space on both sides of the axial direction of the blocking portion 731. When the blocking portion 731 is separated from the first flow port, the space on both sides of the axial direction of the first flow port 104 and the second flow port 7311 are connected, so that the water inlet 201 can be connected to the sewage outlet 102 through the first flow port 104 and the second flow port 7311.

[0176] In the flushing mode, the water inlet and the drain port 404 on the mounting seat 410 are both in an open state, and the water in the water filter chamber 101 can enter the mounting seat 410, thereby driving the impeller body 440 to rotate. Since the exoskeleton 50 and the impeller body 440 are fixedly connected in the circumferential direction, a driving force can be provided for the rotation of the exoskeleton 50. The rotation of the exoskeleton 50 can disturb the water flow in the water filter chamber 101, prevent impurities from being deposited and attached to the filter component 30, the exoskeleton 50 and the side walls of the water filter chamber 101, and reduce the possibility of blockage of the filter component 30, thereby ensuring the filtering effect of the filter component 30.

[0177] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9, the connecting portion 732 is provided through the impeller body 440, one end is fixedly connected to the blocking portion 731, and the other end is transmission-connected to the reversing member 720. That is, the blocking portion 731 is located on the side of the impeller body 440 away from the filter assembly 30, and a through hole is provided on the impeller shaft 441 of the impeller body 440, and the connecting portion 732 is provided through the through hole, and is connected to the reversing member 720 on the other side of the impeller body 440. In this way, the through hole on the impeller shaft 441 can provide a guiding effect for the connecting portion 732 to ensure that the movable member 730 can stably move between different positions. At the same time, the connecting portion 732 can provide a supporting effect for the impeller body 440, and the impeller body 440 can rotate smoothly around the connecting portion 732. Of course, in other embodiments, it can also be that the blocking portion 731 is provided between the mounting seat 410 and the outer frame 50, and the connecting portion 732 is connected to the reversing member 720 after passing through the outer frame 50.

[0178] Further, in this embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 , the connecting portion 732 is also penetrated through the mounting seat 410, the blocking portion 731 and the outer frame 50 are respectively located on the axial sides of the mounting seat 410, the drain port 404 is arranged on the opposite side of the mounting seat 410 and the blocking portion 731, and the blocking portion 731 can be detachably abutted against the side of the mounting seat 410 away from the outer frame 50, and can detachably block the drain port 404. That is, both axial side surfaces of the mounting seat 410 are provided with through holes. The connecting portion 732 penetrates into the through hole of the impeller body 440 from the side of the mounting seat 410 away from the filter assembly 30, and penetrates out from the side of the mounting seat 410 close to the filter assembly 30, and then passes through the outer frame 50, extends into the filter assembly 30 and connects with the reversing member 720. The impeller assembly 40 includes a mounting seat 410 and an impeller body 440, and the blocking portion 731 is located outside the impeller assembly 40, which is conducive to simplifying the structure of the mounting seat 410 and facilitating the modular design of the impeller assembly 40. Of course, in other embodiments, the blocking portion 731 can also be arranged inside the mounting seat 410, and the connecting portion 732 can be sequentially arranged through the impeller body 440, the axial side surface of the mounting seat 410 close to the outer frame 50, and the outer frame 50. In this case, the sealing ring surface 711 corresponds to the inner circumferential surface of the mounting seat 410.

[0179] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9, the pre-filter also includes a reversing bottom shell 710, the blocking portion 731 extends into the inner side of the reversing bottom shell 710, and is slidably connected to the reversing bottom shell 710. It can be understood that both axial sides of the reversing bottom shell 710 are provided with openings, which do not interfere with the cooperation between the blocking portion 731 and the first flow port and the communication between the second flow port 7311 and the sewage outlet 102. In this embodiment, the sliding cooperation between the reversing bottom shell 710 and the blocking portion 731 can provide a guiding effect for the axial movement of the movable part 730. Specifically, the outer periphery of the blocking portion 731 can be slidably matched with the inner periphery of the reversing bottom shell 710.

[0180] Without loss of generality, the reversing bottom shell 710 is fixedly connected to the mounting seat 410, and the reversing bottom shell 710 and the filter assembly 30 are respectively located on both axial sides of the mounting seat 410. Specifically, the reversing bottom shell 710 can be connected to the mounting seat 410 by means of snap-fit ​​or screw connection. Without loss of generality, for the two sides of the reversing bottom shell 710 distributed along the axial direction, one side is fixedly connected to the mounting seat 410, and the other side abuts against the filter bottle 10, so as to improve the installation stability of the reversing bottom shell 710 in the filter bottle 10, thereby improving the guiding effect on the plugging portion 731 and ensuring the sealing cooperation with the plugging portion 731. Of course, in other embodiments, the reversing bottom shell 710 can also be installed on the filter bottle 10.

[0181] Without loss of generality, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 , the inner circumference of the reversing bottom shell 710 is a sealing annular surface 711, and the blocking portion 731 can be slidably sealed with the inner circumference of the reversing bottom shell 710. In this embodiment, the inner circumference of the reversing bottom shell 710 and the outer circumference of the blocking portion 731 can be sealed, and the inner circumference of the reversing bottom shell 710 can provide a guiding effect for the movement of the blocking portion 731 to ensure that the blocking portion 731 switches smoothly between different positions. Of course, in other embodiments, the sealing annular surface 711 can also be formed by the filter bottle 10, and the sealing annular surface 711 on the filter assembly 30 and the filter bottle 10 can be slidably sealed, or the first flow port that matches the blocking portion 731 can also be formed by the reversing bottom shell 710.

[0182] In one embodiment, see Fig.18The side frame 512 is provided with a water flow driving member 540, and the water flow driving member 540 has a driving surface 544, and the driving surface 544 is set at an angle relative to the circumference of the outer frame 50, so that after the driving surface 544 is subjected to the impact of the water flow, it can drive the outer frame 50 to rotate. In this way, when the driving surface 544 is driven by the water flow, the water flow driving member 540 can generate a driving force on the outer frame 50 in the circumference of the outer frame 50, thereby prompting the outer frame 50 to rotate around its axis, that is, around the axial rotation of the filter assembly 30, so that the kinetic energy of the water flow can be converted into the kinetic energy of the rotation of the outer frame 50 through the driving surface 544, and the rotation of the outer frame 50 is realized, thereby disturbing the water flow in the water filter chamber 101, preventing impurities from being deposited and attached to the filter assembly 30, the outer frame 50 and the side wall of the water filter chamber 101, reducing the possibility of clogging of the filter assembly 30, and thus improving the filtering effect of the filter assembly 30. Furthermore, the water flow can form a vortex after passing through the water distributor 60, thereby providing a greater driving force through the driving surface 544. That is, the water distributor 60 cooperates with the water flow driving member 540 to provide a certain rotation driving force to the exoskeleton 50, and the impeller body 440 itself rotates under the impact of the water flow and links the exoskeleton 50, and can also provide a certain rotation driving force to the exoskeleton 50, and these two rotation driving forces are arranged in the same direction.

[0183] In one embodiment, the water flow drive member 540 is clamped to the end of the side frame 512. The water flow drive member 540 is connected to the end of the side frame 512 by clamping, so that the side frame 512 and the water flow drive member 540 are formed separately, which improves the molding probability and convenience. The side frame 512 and the water flow drive member 540 are connected by clamping, and the connection operation is convenient. At the same time, the water flow drive member 540 can also be kept stable at the end of the side frame 512 to improve production efficiency. Of course, in other embodiments, the water flow drive member 540 can also be connected to the side frame 512 by screwing, melting or integral molding, or the water flow drive member 540 is clamped to the axial middle part of the side frame 512.

[0184] Specifically, in this embodiment, a plurality of water flow driving members 540 are provided on the side frame 512, and the plurality of water flow driving members 540 are spaced apart along the circumference of the outer frame 50. It can be understood that the plurality of water flow driving members 540 are spaced apart at the end of the side frame 512 around the circumference of the outer frame 50, so that the plurality of driving surfaces 544 distributed in the circumference of the outer frame 50 tend to be uniform, and thus the driving force received by the outer frame 50 in the circumference can be balanced, so that the outer frame 50 can rotate at a uniform speed to ensure the cleaning effect of the filter assembly 30. Without loss of generality, in this embodiment, the water flow driving member 540 is provided with a plurality of driving surfaces 544, and the plurality of driving surfaces 544 are uniformly distributed on the water flow driving member 540 along the circumference of the outer frame 50, and the plurality of water flow driving members 540 are uniformly distributed in the circumference of the side frame 512, thereby ensuring that the driving surfaces 544 are uniformly distributed in the circumference of the side frame 512, so as to ensure the rotational stability of the outer frame 50. Of course, in other embodiments, a plurality of water flow driving members 540 may also be distributed along the axial direction of the side frame 512 to balance the rotational stability of the outer frame 50 in the axial direction.

[0185] As for the clamping relationship between the water flow drive member 540 and the side frame 512, in this embodiment, the water flow drive member 540 includes a hanging portion 541, and the hanging portion 541 is hung on the end of the side frame 512 and is clamped with the side frame 512. It can be understood that the water flow drive member 540 is hung from the end of the side frame 512 toward the side frame 512 along the axial direction, and the connection operation is convenient and the connection is stable. After the hanging portion 541 is hung on the side frame 512, the water flow drive member 540 is clamped with the side frame 512. Here, the hanging portion 541 can be clamped on the side frame 512, or other parts of the water flow drive member 540 can be clamped on the side frame 512. In this way, the connection in a hanging manner provides a positioning reference for the connection between the water flow drive member 540 and the side frame 512, and simplifies the connection between the water flow drive member 540 and the side frame 512. In addition, after the hooking portion 541 is hooked to the side wall, a limit is formed on the water flow driving member 540 in the radial direction to prevent the water flow driving member 540 from moving radially relative to the side frame 512. Of course, in other embodiments, the water flow driving member 540 can also be connected to the side wall by plugging, or by turning a knob.

[0186] The water flow driving member 540 also includes a driving body 542 connected to the hanging portion 541, the driving body 542 is hung on the inner side of the side frame 512, the hanging portion 541 is engaged with the outer side of the side frame 512, and the driving surface 544 is formed on the driving body 542. Without loss of generality, the gap between the outer frame 50 and the shell is small, and the gap between the outer frame 50 and the filter assembly 30 is large to ensure the efficiency of filtering the water through the filter assembly 30. In this way, the driving body 542 with the driving surface 544 is arranged on the inner side of the side frame 512 to prevent the tension between the side wall of the water filter chamber 101 and the water flow from affecting the impact force of the water flow on the driving surface 544, thereby ensuring the rotation stability and reliability of the outer frame 50. In addition, since the driving surface 544 is arranged on the driving body 542, the driving body 542 inevitably maintains good flatness in the circumferential direction of the side frame 512. The driving body 542 is arranged on the inner side of the side frame 512, which can ensure the flatness of the outer side of the outer frame 50, avoid the interference of the shell with the rotation of the outer frame 50, and ensure that the driving surface 544 obtains sufficient water flow impact. At the same time, the hanging part 541 is clamped on the outer side of the side frame 512, and the driving body 542 is on the inner side of the side frame 512, balancing the force of the water flow driving member 540 in the inner and outer directions of the side frame 512, thereby ensuring the connection stability of the water flow driving member 540 and the side frame 512. Of course, in other embodiments, when the gap between the side frame 512 and the cavity wall of the water filter cavity 101 is large, the driving body 542 can also be arranged on the outer side of the side frame 512.

[0187] In one embodiment, the driving surface 544 is parallel to the axial direction of the outer frame 50. It can be understood that the driving surface 544 is distributed in the circumferential direction of the side frame 512, and can refer to the arrangement of the guide blades 621 in the water distributor 60, and the water flow is guided to impact the driving surface 544 by the guiding effect of the guide blades 621 on the water flow, or a drainage structure is set on the channel wall between the water inlet 201 and the water flow driving member 540, and the water flow is guided in a vortex shape along the axial direction of the filter assembly 30, so that it can directly impact the driving surface 544 parallel to the axial direction of the outer frame 50, so that the water flow driving member 540 can obtain a larger water flow impact force, improve the rotation speed or rotation efficiency of the outer frame 50, avoid impurities from adhering to the filter assembly 30, ensure the cleanliness of the filter assembly 30, and improve the filtering efficiency of the filter assembly 30 for the water flow. Of course, in other embodiments, the driving surface 544 can also be inclined relative to the axial direction of the outer frame 50, or, relative to the radial direction of the side frame 512.

[0188] In one embodiment, the driving body 542 extends along the circumferential arc of the side frame 512, and a plurality of water baffles 543 are spaced apart, and the driving surface 544 is formed on the water baffles 543. Without loss of generality, the water baffles 543 are protruding from the driving body 542, and the driving surface 544 is formed on the side wall of the water baffles 543 along the circumferential direction of the side frame 512, so that the driving surface 544 can have a certain size in the radial direction, ensuring that the driving surface 544 is stably impacted by the water flow, and at the same time, the driving body 542 extends along the inner circumference of the side frame 512, and the plurality of water baffles 543 are spaced apart in the extension direction of the driving body 542, so as to evenly distribute the driving force in the circumferential direction of the side frame 512, and ensure the stability of the rotation of the exoskeleton 50. In addition, the driving body 542 is arranged in a conformal manner on the inner circumferential wall of the side frame 512, and the two are closely fitted. When the driving body 542 is subjected to force, the inner wall of the side frame 512 can provide a sufficiently stable support for the driving body 542, thereby effectively pulling the side frame 512 to rotate, avoiding shaking between the water flow driving member 540 and the side frame 512, resulting in energy waste, ensuring the rotation efficiency of the outer frame 50, and improving the cleaning effect of the filter assembly 30. Of course, in other embodiments, a driving groove can also be recessed on the driving body 542, and the side groove wall of the driving groove is configured as a driving surface 544.

[0189] In one embodiment, please refer to Fig.18 The side frame 512 is also provided with a cleaning structure 90, which is staggered with the siphon flow channel 501. The cleaning structure 90 can also be arranged in multiple groups in the circumferential direction to clean at least one of the inner wall of the filter bottle 10 and the outer peripheral side of the filter module 300. In the flushing mode, with the rotation of the outer frame 50, the cleaning structure 90 can sweep away the impurities on the relevant structure through the cleaning effect, so that the impurities are separated and can be discharged with the water flow, thereby avoiding serious blockage on the filter assembly 30, ensuring the filtering effect of the filter assembly 30, and improving the service life of the pre-filter.

[0190] In one embodiment, see Figure 23 to Figure 25The cleaning structure 90 includes an inner cleaning brush 910 protruding from the inner circumference of the outer frame 50, and the inner cleaning brush 910 includes a cleaning portion 911, and the cleaning portion 911 extends in the axial direction of the outer frame 50. The cleaning portion 911 and the filter element 320 are correspondingly arranged so as to clean the filter element 320 through the cleaning portion 911. Since the filter element 320 of the filter assembly 30 has a certain extension in the radial direction of the outer frame 50, the side portion of the cleaning portion 911 distributed in the axial direction of the outer frame 50 can be arranged opposite to the filter element 320, and the filter element 320 can be scraped and washed by the side portion, so that the filter element 320 can be covered more comprehensively, thereby increasing the cleaning area of ​​the filter element 320 by the cleaning portion 911, and avoiding dead angles to a large extent. As a result, the cleaning effect of the pre-filter on the filter assembly 30 can be improved, thereby increasing the service life of the pre-filter.

[0191] In one embodiment, the cleaning portion 911 extends obliquely relative to the axial direction of the outer frame 50. In this way, the deformation capacity of the cleaning portion 911 in the axial direction of the outer frame 50 can be improved. It can be understood that the cleaning portion 911 and the filter element 320 will abut and fit in the axial direction of the outer frame 50, and the cleaning portion 911 is easy to deform in the abutment and fitting direction of the two, which is conducive to reducing the pressure between the cleaning portion 911 and the filter element 320, thereby reducing the friction between the cleaning portion 911 and the filter element 320 when the outer frame 50 and the filter assembly 30 rotate relative to each other, so that the outer frame 50 can smoothly rotate relative to the filter assembly 30 to ensure that the cleaning portion 911 fully cleans the filter element 320 in the circumferential direction.

[0192] Furthermore, the cleaning portion 911 extends obliquely along the circumference of the exoskeleton 50 relative to the axial direction of the exoskeleton 50. It can be understood that the direction in which the cleaning portion 911 is inclined is a direction that is conducive to its deformation. In this embodiment, the exoskeleton 50 rotates along the circumference, and the cleaning portion 911 is easy to deform in the circumference of the exoskeleton 50, which is conducive to further reducing the friction between the cleaning portion 911 and the filter element 320 to ensure the smooth rotation of the exoskeleton 50. In addition, the cleaning portion 911 can more easily cover more area on the filter element 320, which is conducive to improving the cleaning effect of the cleaning portion 911 on the filter element 320.

[0193] In one embodiment, a plurality of cleaning parts 911 are distributed in the axial direction of the outer frame 50, and one cleaning part 911 is provided corresponding to one filter element 320. In this way, one cleaning part 911 can be used to clean one filter element 320 to ensure the cleaning effect of the filter assembly 30.

[0194] In one embodiment, see Fig.23, there are multiple cleaning structures 90 distributed in the circumferential direction of the outer skeleton 50. Among them, it can be that each cleaning structure 90 is provided with the same number of cleaning parts 911 corresponding to the number of filter elements 320, so that each filter element 320 will be cleaned by the cleaning parts 911 of multiple cleaning structures 90 distributed in the circumferential direction, which is beneficial to ensure the cleaning effect of the filter assembly 30. Of course, it can also be that a cleaning part 911 is only provided for part of the filter elements 320 on a cleaning structure 90, and the cleaning parts 911 are staggered on multiple cleaning structures 90 distributed in the circumferential direction, so that each filter element 320 is provided with at least one cleaning part 911. In this way, under the premise of ensuring the coverage of the cleaning structure 90 on the filter element 320, the friction between the cleaning part 911 and the filter element 320 can also be dispersed in the circumferential direction, which is beneficial to ensure the stability and smoothness of the rotation of the outer skeleton 50.

[0195] The plurality of cleaning parts 911 are arranged to be tilted relative to the axial direction of the exoskeleton 50 along the same circumferential direction of the exoskeleton 50. In this way, the tilting direction of the cleaning parts 911 can be conveniently set according to the need of the rotation direction of the exoskeleton 50 to reduce the friction between the cleaning parts 911 and the cleaning surface, thereby ensuring the smooth rotation of the exoskeleton 50. For example, when the exoskeleton 50 needs to rotate clockwise, each cleaning part 911 is tilted in the counterclockwise direction.

[0196] In one embodiment, see Fig.24 In the schematic diagram on the right side, the side of the cleaning part 911 distributed in the axial direction of the outer frame 50 is inclined. The side of the cleaning part 911 used to clean the filter element 320 is set to an inclined shape corresponding to the filter element 320, which can improve the fit between the cleaning part 911 and the filter element 320, and is conducive to improving the cleaning force of the cleaning part 911 on the filter element 320, thereby ensuring the cleaning effect of the filter assembly 30 and ensuring the life of the pre-filter.

[0197] In one embodiment, see Fig.29 For the cleaning parts 911 located at the same axial position, the angle α between two adjacent cleaning parts 911 is an acute angle. In this way, the spatial arrangement of the cleaning parts 911 can be facilitated, and at the same time, it is beneficial to ensure that the cleaning parts 911 cover the filter element 320 in the axial direction.

[0198] In one embodiment, see Figure 23 to Figure 25The inner cleaning brush 910 further includes a base portion 912, which is protruding from the inner circumference of the outer frame 50, and the cleaning portion 911 is connected to the outer circumference of the base portion 912. In this way, the base portion 912 can provide support for the cleaning portion 911 to improve the structural strength of the inner cleaning brush 910, and the cleaning portion 911 can be connected to the outer frame 50 through the base portion 912, without extending to the inner circumference of the outer frame 50 to connect with the outer frame 50. The cleaning portion 911 only needs to maintain the axial coverage of the filter element 320. Of course, in other embodiments, the cleaning portion 911 can also be directly connected to the outer frame 50.

[0199] In one embodiment, one base portion 912 is provided with two cleaning portions 911 extending in opposite directions in the axial direction of the outer frame 50. In this way, the two cleaning portions 911 provided on one base portion 912 can clean two filter elements 320, which is helpful to simplify the structure of the cleaning structure 90. Of course, in other embodiments, the base portion 912 and the cleaning portion 911 may be provided in a one-to-one correspondence.

[0200] Furthermore, a base portion 912 is correspondingly provided at the connection of the two filter modules 300, and two cleaning portions 911 on the base portion 912 extend in opposite directions relative to the base portion 912 in the axial direction of the outer frame 50. In this way, the connection of the two adjacent filter modules 300 can form a space for accommodating the internal cleaning brush 910, and the two cleaning portions 911 on the base portion 912 can be used to clean the filter elements 320 on the adjacent sides of the two filter modules 300, which is conducive to improving the compactness of the internal structure of the pre-filter, thereby improving the utilization rate of the internal space of the water filter chamber 101, and is conducive to realizing the miniaturization design of the pre-filter.

[0201] In this embodiment, the internal cleaning brush 910 has two types of structures. For the internal cleaning brush 910 provided at the connection between the two filter modules 300, two cleaning parts 911 extending in opposite directions in the axial direction of the outer frame 50 are provided on a base part 912. For the internal cleaning brush 910 provided at the end of the filter assembly 30, only one cleaning part 911 is required to be provided on the base part 912. The structure of the internal cleaning brush 910 can be the structure of the aforementioned internal cleaning brush 910 divided in half. Without loss of generality, in the former type of internal cleaning brush 910, the base part 912 can be cylindrical, and the two cleaning parts 911 are distributed on both sides of the axis of the cylinder. In the latter type of internal cleaning brush 910, the base part 912 is configured as half a cylinder, and the cleaning parts 911 are connected to the circumference of the cylinder.

[0202] In one embodiment, see Fig.24 and Fig.29, the cleaning portion 911 is configured as a sheet structure. In this way, the cleaning portion 911 is relatively thin, and the cleaning portion 911 can have an appropriate thickness d, and can have good deformation ability. When the cleaning portion 911 abuts against the filter element 320, it will not generate too much resistance to the filter element 320, thereby avoiding the situation where the filter element 320 is stuck and the outer skeleton 50 cannot rotate. It can be understood that the thickness of the cleaning portion 911 needs to be able to meet the requirements for deformation ability, and also ensure that the cleaning portion 911 has sufficient structural strength, and ensure the connection stability between the cleaning portion 911 and the base portion 912 or other related structures.

[0203] In one embodiment, the cleaning portion 911 and the filter element 320 are in interference fit. In this way, the cleaning portion 911 can clean the impurities of the filter element 320 more deeply, thereby enhancing the cleaning force of the cleaning structure 90 on the filter assembly 30, so as to ensure the filtering effect of the filter assembly 30 and increase the service life of the pre-filter. Among them, the degree of abutment between the cleaning portion 911 and the filter element 320 needs to be within an appropriate range. While ensuring the cleaning force of the cleaning portion 911 on the filter element 320, the friction between the cleaning portion 911 and the filter element 320 will not be too large, so as to avoid excessive interference with the rotation of the external skeleton 50 and reduce the wear on the cleaning portion 911.

[0204] In one embodiment, the cleaning structure 90 is detachably mounted on the outer frame 50. In this way, when the cleaning portion 911 is excessively worn and cannot effectively clean the filter assembly 30, the original cleaning structure 90 can be conveniently removed and replaced with a new cleaning structure 90. Of course, in other embodiments, only the cleaning portion 911 can be removed and replaced to save the maintenance cost of the pre-filter.

[0205] In one embodiment, see Fig.23 and Fig.25 , the cleaning structure 90 also includes a mounting portion 930, on which a plurality of internal cleaning brushes 910 are disposed, and a mounting groove is correspondingly disposed on the exoskeleton 50, and the mounting portion 930 is snapped into the mounting groove. It can be understood that the mounting portion 930 extends along the axial direction of the exoskeleton 50, and the plurality of internal cleaning brushes 910 are also distributed in the axial direction of the exoskeleton 50. In this way, a plurality of internal cleaning brushes 910 can be installed on the exoskeleton 50 through a mounting portion 930, and the mounting portion 930 and the exoskeleton 50 can be disassembled and assembled to replace the plurality of internal cleaning brushes 910, thereby improving the convenience of maintenance of the cleaning structure 90. Of course, in other embodiments, the internal cleaning brush 910 may also be directly connected to the exoskeleton 50.

[0206] In one embodiment, see Fig.30, some corners of the mounting portion 930 are set to a chamfered shape, and the corners corresponding to the mounting groove are configured to have the same chamfered shape. Among the corners of the mounting portion 930, only some are set to a chamfered shape, and the corners of the mounting groove are set to a corresponding chamfered shape. In this way, it is easy to match the corners corresponding to the mounting portion 930 and the mounting groove, and it plays a fool-proof role in the assembly process of the cleaning structure 90 and the outer frame 50, and can prevent the cleaning structure 90 from being installed upside down. Of course, in other embodiments, fool-proofing can also be performed in other ways, for example, an arrow indicating a direction is set on the outer side of the mounting portion 930.

[0207] In the embodiment of the present invention, the mounting portion 930 and the inner cleaning brush 910 are integrally formed. Specifically, the mounting portion 930 and the inner cleaning brush 910 are integrally formed, so that the inner cleaning brush 910 is conveniently installed and the installation of the inner cleaning brush 910 is stable.

[0208] Without loss of generality, see Fig.18 and Fig.19 There are multiple siphon channels 501, cleaning structures 90 and water flow driving members 540. The multiple siphon channels 501 and the multiple cleaning structures 90 are alternately distributed in the circumferential direction of the side frame 512. The water flow driving member 540 can be arranged corresponding to the cleaning structure 90. In this way, the flushing effect of the pre-filter can be guaranteed.

[0209] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 The pre-filter also includes a movable part 730, which is movably disposed in the water filter chamber 101 so that the pre-filter can switch between a filtering mode and a flushing mode. The water inlet 201 and the water outlet 202 are disposed on one side of the movable part 730, and the sewage outlet 102 is disposed on the other side of the movable part 730. The spaces on the opposite sides of the movable part 730 are isolated in the filtering mode and connected in the flushing mode.

[0210] In the technical solution of the present invention, the movable part 730 moves in the water filter chamber 101, so that the space on both sides of the movable part 730 switches between a blocked state and a connected state, thereby switching the pre-filter between a filtering mode and a flushing mode.

[0211] In the filtering mode, the water outlet 202 is open and the sewage outlet 102 is closed. After the raw water entering from the water inlet 201 enters the water filter chamber 101, it is filtered by the filter assembly 30 and flows to the water outlet 202. At this time, the movable part 730 is in a position to separate the space on both sides; in the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened. The water flow entering from the water inlet 201 can flush the filter assembly 30 in the water filter chamber 101. In this mode, the impurities attached to the filter assembly 30 can be cleaned, and then the sewage can flow out through the sewage outlet 102. At this time, the movable part 730 is in a position to conduct the space on both sides, so that the water inlet 201 and the sewage outlet 102 can be connected. Among them, when the pre-filter is in the filtering mode, the water inlet 201, the water outlet 202 and the filter assembly 30 can be relatively concentrated on the same side of the movable part 730, so that the raw water can be filtered more efficiently through the filter assembly 30.

[0212] In one embodiment, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 A first flow port 104 is formed in the water filter chamber 101, and a penetration direction of the first flow port 104 is parallel to a penetration direction of the sewage outlet 102. The movable member 730 includes a blocking portion 731, and the blocking portion 731 is axially movable relative to the shell, and blocks the first flow port 104 in the filtering mode, and opens the first flow port 104 in the flushing mode.

[0213] It can be understood that parallel means parallel or approximately parallel. In this way, the movement direction of the blocking portion 731 will be parallel to the distribution direction of the water inlet 201 and the sewage outlet 102, and the direction of the force of the pressure difference on the blocking portion 731 can also be parallel to the movement direction, which can more reliably drive the blocking portion 731. In addition, the penetration direction of the first flow port 104 and the movement direction of the movable part 730 are correspondingly set to the same direction, which can facilitate the layout of various structures in the water filter chamber 101 and enhance the structural symmetry of the pre-filter, thereby ensuring the water pressure stability of the pre-filter in the water filter chamber 101, so as to ensure the working stability of the pre-filter.

[0214] Of course, in other embodiments, the setting mode of the first flow port 104 and the movement direction of the movable part 730 can also be adaptively adjusted to other directions, or, when the penetration direction of the first flow port 104 is parallel to the penetration direction of the sewage outlet 102, the movable part 730 can also be rotatably arranged, and a through hole eccentric to the rotation axis is arranged on the blocking part 731. At this time, the movable part 730 can be driven to rotate so that the through hole is opposite to the first flow port 104 or staggered with the first flow port 104. When the two are opposite, the first flow port 104 can be opened, and when the two are staggered, the blocking part 731 blocks the first flow port 104.

[0215] Without loss of generality, please also refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 The first flow port 104 is located between the water inlet 201 and the sewage outlet 102, specifically, between the filter assembly 30 and the sewage outlet 102. The blocking portion 731 can be located on the side of the first flow port 104 close to the filter assembly 30, or on the side of the first flow port 104 close to the sewage outlet 102. Of course, in other embodiments, the sewage outlet 102 can also be used as the first flow port 104.

[0216] Please also refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 , Fig.12 and Fig.13 A sealing ring surface 711 is arranged in the water filter chamber 101 corresponding to the sealing portion 731, and the axial direction of the sealing ring surface 711 is parallel to the penetration direction of the first flow port 104. The outer peripheral seal of the sealing portion 731 is matched with the sealing ring surface 711 and can move axially relative to the sealing ring surface 711; the axial side of the sealing portion 731 can be detachably sealed on the first flow port 104, and the sealing portion 731 is provided with a second flow port 7311, and the second flow port 7311 and the first flow port 104 are staggered. In the flushing mode, the two ends of the second flow port 7311 are respectively connected to the spaces on both sides of the axial direction of the sealing portion 731.

[0217] That is, when the blocking portion 731 blocks the first flow port 104 through the solid structure around the second flow port 7311, the solid structure around the first flow port 104 can block the second flow port 7311, thereby isolating the space on both sides of the movable member 730, and when the blocking portion 731 is separated from the first flow port 104, the spaces on both sides of the axial direction of the first flow port 104 and the second flow port 7311 are connected, so that the water inlet 201 can be connected to the sewage outlet 102 through the first flow port 104 and the second flow port 7311. In addition, during the movement of the movable member 730, the outer periphery of the blocking portion 731 always maintains a state of sealing and matching with the sealing annular surface 711, which is conducive to ensuring the isolation of the space on both sides of the movable member 730 in the filtering mode, and avoiding water seepage from the side where the water inlet 201 is located to the side where the sewage outlet 102 is located, which affects the filtering process of the pre-filter. Furthermore, the sealing annular surface 711 can provide guidance for the movement of the blocking portion 731 to ensure that the blocking portion 731 switches smoothly between different positions.

[0218] Of course, in other embodiments, the outer periphery of the sealing portion 731 may be matched with the gap between other structures in the water filter chamber 101, and no flow structure is provided on the sealing portion 731. When the sealing portion 731 leaves the first flow port 104, the flow passes through the gap between the outer periphery of the sealing portion 731 and other structures. The sealing portion 731 is provided with a sealing structure corresponding to the first flow port 104 to ensure the sealing effect and the partition effect on the spaces on both sides.

[0219] Without loss of generality, please refer to Figure 3 , Figure 5 , Figure 7 , Fig. 9 , the outer periphery of the blocking portion 731 is sleeved with a sealing member, and the inner periphery and outer periphery of the sealing member are respectively in contact with the blocking portion 731 and the sealing annular surface 711. In this way, the blocking portion 731 can achieve a sealing fit between the outer periphery and the sealing annular surface 711 through the sealing member, and the sealing member can be filled between the outer periphery of the blocking portion 731 and the sealing annular surface 711 in an interference fit, but the interference should not be too high to ensure that the blocking portion 731 can move relatively smoothly along the sealing annular surface 711. Of course, in other embodiments, the outer periphery of the blocking portion 731 can also be formed with an elastic deformation portion, and the elastic deformation portion and the sealing annular surface 711 are sealed and matched.

[0220] Furthermore, if Fig.21As shown, there are a plurality of first flow openings 104 distributed at intervals along the circumference of the water filter chamber 101. That is, more than two first flow openings 104 are distributed at intervals in the circumferential direction, so that the range of the flow area can be effectively increased. The plurality of first flow openings 104 should be distributed around the central axis of the water filter chamber 101 so that the flow area is relatively concentrated, that is, a relatively concentrated flow area with a certain amount of coverage can be formed in the water filter chamber 101, which is conducive to ensuring that the water flows smoothly through the first flow opening 104. Of course, in other embodiments, it is also possible that only one first flow opening 104 is provided, and the blocking portion 731 covers the end side of the first flow opening 104, or the blocking portion 731 enters the first flow opening 104, and the sealing ring 1002 provided on the outer peripheral side cooperates with the inner peripheral seal of the first flow opening 104, thereby achieving the blocking of the first flow opening 104.

[0221] Furthermore, if Fig.12 and Fig.13 As shown, there are a plurality of second flow openings 7311 spaced apart along the circumference of the water filter chamber 101. That is, more than two second flow openings 7311 are spaced apart along the circumferential direction on the blocking portion 731, so that the range of the flow area can be effectively increased. The plurality of second flow openings 7311 should be distributed around the center of the blocking portion 731 so that the flow area is relatively concentrated, that is, a relatively concentrated flow area with a certain amount of coverage can be formed on the blocking portion 731, which is conducive to ensuring that the water flows smoothly through the second flow openings 7311, and the blocking portion 731 does not need to have a second flow opening 7311 with a large area, which is conducive to ensuring the structural strength of the blocking portion 731. Furthermore, the plurality of second flow openings 7311 can be evenly spaced apart around the center of the blocking portion 731 to improve the flow uniformity of the blocking portion 731. Without loss of generality, the two second flow openings 7311 are evenly spaced around the center of the blocking portion 731, that is, the two second flow openings 7311 are relatively distributed on both sides of the center of the blocking portion 731 in the same radial direction of the blocking portion 731. Of course, in other embodiments, only one second flow opening 7311 may be provided.

[0222] Furthermore, the first flow opening 104 and the second flow opening 7311 are staggered in the circumferential direction and / or radial direction of the water filter chamber 101. That is, the first flow opening 104 and the second flow opening 7311 are staggered in at least one of the circumferential direction and radial direction of the water filter chamber 101, so that when the blocking portion 731 blocks the first flow opening 104, the second flow opening 7311 will not be opposite to the first flow opening 104, that is, the water inlet 201 and the sewage outlet 102 can be separated, and when the blocking portion 731 leaves the first flow opening 104, the water inlet 201 and the sewage outlet 102 can be connected through the first flow opening 104 and the second flow opening 7311. In particular, when the first flow opening 104 and the second flow opening 7311 are staggered in both the circumferential direction and the radial direction, the path of water flowing from the first flow opening 104 to the second flow opening 7311 can be extended, thereby providing a buffering effect and preventing the water from flowing too fast.

[0223] Furthermore, the first flow opening 104 and the second flow opening 7311 are distributed in plurality at intervals along the circumference of the water filter chamber 101, and the plurality of the first flow openings 104 and the plurality of the second flow openings 7311 are staggered in the circumferential and radial directions of the water filter chamber 101. Specifically, when the blocking portion 731 blocks the first flow opening 104, the first flow opening 104 and the second flow opening 7311 are staggered in the axial direction, and the position of a second flow opening 7311 in the circumferential direction is correspondingly located between two adjacent second flow openings 7311. In addition, if the flow area of ​​a single first flow opening 104 is larger than the flow area of ​​a single second flow opening 7311, the number of first flow openings 104 can be adaptively set to be greater than the number of second flow openings 7311, so that the flow capacities of multiple first flow openings 104 and multiple second flow openings 7311 are equivalent, thereby ensuring the smooth flow of water to the sewage outlet 102.

[0224] Without loss of generality, the movable member 730 and the reversing member 720 are connected in transmission, so that the movable member 730 and the reversing member 720 can be linked, and while the flow path of the water inlet 201 and the filter assembly 30 is switched by the reversing member 720, the connection relationship between the sewage outlet 102 and the water inlet 201 can also be changed by the movable member 730. Of course, in other embodiments, the reversing member 720 and the movable member 730 may not be connected in transmission, but may be driven by different driving sources respectively, and cooperate with each other to form a flushing flow path and a filtering flow path.

[0225] In one embodiment, at least one of the reversing member 720 and the movable member 730 is connected to an elastic member 1003. Under the action of the elastic member 1003, the reversing member 720 and the movable member 730 can naturally maintain a position corresponding to the filtering mode. When the pre-filter switches from the filtering mode to the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened, so that there is a pressure difference between the water inlet 201 and the sewage outlet 102, and the side of the movable member 730 close to the water inlet 201 will be subjected to pressure, so that the movable member 730 moves toward the sewage outlet 102, thereby driving the reversing member 720 to move accordingly, so that a flushing flow path from the water inlet 201 to the sewage outlet 102 is formed in the pre-filter, and at the same time, the elastic member 1003 will undergo elastic deformation. When the pre-filter switches from the flushing mode to the filtering mode, the sewage outlet 102 is closed, the water outlet 202 is opened, and the elastic member 1003 will restore its deformation, thereby driving the reversing member 720 and the movable member 730 to return to the position corresponding to the filtering mode, that is, the movable member 730 will return to the position separating the spaces on both sides. Thereafter, in the absence of external force, the movable member 730 can be stably in the current position to provide a stable working environment for the filtering process of the pre-filter.

[0226] Of course, in other embodiments, the mode switching of the pre-filter may be controlled by other driving methods, such as manually twisting a screw rod. The user can switch the pre-filter to different modes by twisting the screw rod in different directions.

[0227] In one embodiment, please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 , the two ends of the elastic member 1003 are respectively connected to the switching member 720 and the filter assembly 30. Specifically, the elastic member 1003 is arranged between the switching member 720 and the filter assembly 30, so that one end of the elastic member 1003 is connected to the switching member 720, and the other end is connected to the filter assembly 30, thereby facilitating the installation of the elastic member 1003. Among them, the other end of the elastic member 1003 can be connected to the filter part of the filter assembly 30, and can also be connected to the water distributor 60.

[0228] The elastic member 1003 can be configured as a spring, so as to facilitate the installation of the elastic member 1003 and reduce the interference of the elastic member 1003 with the water flow inside the water filter chamber 101. In other embodiments, the elastic member 1003 can also be configured as an elastic block or an elastic sleeve, in which case, the elastic member 1003 is provided with an escape space for the water flow to pass through.

[0229] Furthermore, the elastic member 1003 is installed between the reversing member 720 and the water distributor 60. Specifically, because water needs to flow between the filter portion of the filter assembly 30 and the reversing member 720, especially in the flushing mode, the reversing member 720 sprays water from the inner periphery of the filter assembly 30 to the outside thereof to flush the filter assembly 30, the presence of the elastic member 1003 may affect the impact strength of the water flow, and therefore, the elastic member 1003 is arranged between the reversing member 720 and the water distributor 60.

[0230] Furthermore, one end of the elastic member 1003 is located inside the annular main body 7221, which helps to ensure the stable installation of the elastic member 1003, reduce the possibility of accidents of the elastic member 1003, and further reduce the interference of the elastic member 1003 on the water flow inside the water filter chamber 101. In other embodiments, the elastic member 1003 can also be arranged on the outside of the annular main body 7221. In this case, one end of the elastic member 1003 facing the connecting portion 721 can be sleeved on the annular main body 7221, thereby facilitating the annular main body 7221 to guide the elastic member 1003 to extend and contract. At this time, there may be no direct connection between the elastic member 1003 and the baffle skirt 7222, and one end of the elastic member 1003 abuts against the side of the baffle skirt 7222 facing the water distributor 60.

[0231] For further information, see Fig.26 and Fig. 27 The inner circumference of the annular main body 7221 is further provided with a water passing portion 7224. In the filtering mode, the inner circumference of the water passing portion 7224 is connected to the inner circumference of the filtering assembly 30 through the second connecting hole 7225;

[0232] The water distributor is provided with a blocking portion 604 , and in the flushing mode, the blocking portion 604 blocks the communication between the inner periphery of the water passing portion 7224 and the inner periphery of the filter assembly 30 .

[0233] Specifically, the blocking portion 604 is disposed in the first water flow space 610 and is convexly disposed toward the direction of the water isolation ring 210. The first water flow space 610 includes a portion located at the outer periphery of the blocking portion 604 and a portion located at the inner periphery of the blocking portion 604. The hollow tube section 723 is inserted from the inner periphery of the blocking portion 604 to the inner periphery of the filter module 300. The peripheral wall of the water flow portion 7224 is often provided with a second connecting hole 7225. Therefore, in the filtering mode, please refer to Figure 3 and Figure 4 The blocking portion 604 and the water passing portion 7224 are arranged at intervals, so that the inner periphery of the filter assembly 30 can be connected to the second connecting hole 7225 through the first water passing space 610, thereby facilitating the filtered raw water to flow into the inner periphery of the reversing member 720. In the flushing mode, please refer to Figure 7 and Figure 8The blocking portion 604 abuts against the water passing portion 7224 at the side of the second communicating hole 7225 away from the water isolation ring 210 , thereby blocking the communication between the second communicating hole 7225 and the inner periphery of the filter assembly 30 .

[0234] In the flushing mode, the reversing member 720 sprays water to the inner periphery of the filter assembly 30 through the first connecting hole 7231 to flush the filter assembly 30, so sufficient water pressure is required. If the inner periphery of the reversing member 720 is connected to the inner periphery of the filter assembly 30 through the second connecting hole 7225, it may cause the dispersion of the water flow, affecting the impact effect of the water flow on the filter assembly 30. Therefore, by blocking the connection between the second connecting hole 7225 and the inner periphery of the filter assembly 30, the inner periphery of the hollow tube section 723 is directly connected to the inner periphery of the filter assembly 30 through the first connecting hole 7231 to ensure the impact force of the water flow. In the filtering mode, the second connecting hole 7225 can increase the water flow area of ​​the water flow portion 7224, thereby increasing the water output of the inner periphery of the filter assembly 30.

[0235] Furthermore, one end of the elastic member 1003 is sleeved on the water passing portion 7224, and the other end is sleeved on the blocking portion 604. Thus, both opposite ends of the elastic member 1003 have guide structures, thereby improving the installation stability of the elastic member 1003.

[0236] In one embodiment, the width of the second connecting hole 7225 is greater than the width of the first connecting hole 7231. The first connecting hole 7231 has a smaller width, which is more conducive to forming a water flow that is ejected outward, and the second connecting hole 7225 has a larger width, which is conducive to increasing the water flow capacity of the reversing member 720 in the filtering mode. Of course, in other embodiments, the width of the second connecting hole 7225 can also be smaller than the width of the first connecting hole 7231. In this case, by increasing the distribution density of the second connecting holes 7225, the water flow capacity of the reversing member 720 in the filtering mode can also be greatly increased.

[0237] In one embodiment, see Fig.11 , the first connecting hole 7231 is configured as a strip hole extending in the axial direction. In this way, the width of the first connecting hole 7231 can be designed to be relatively small, so that the water flow on the inner periphery of the hollow tube section 723 can be sprayed through the first connecting hole 7231, and because the first connecting hole 7231 extends in the axial direction, it is beneficial to ensure that the first connecting hole 7231 covers the filter structure on the filter module 300, thereby ensuring the flushing effect of the filter module 300, and it is also beneficial to form a uniform spray water flow in the axial direction, so that the filter structure can be subjected to a uniform impact force in the axial direction, thereby ensuring the structural stability of the filter assembly 30. Of course, in other embodiments, it can also be, such as Figure 7 As shown, a plurality of first communicating holes 7231 are provided which are spaced apart along the axial direction.

[0238] Specifically, the width D of the first connecting hole 7231 is 1 mm to 2 mm. That is, the width D of the first connecting hole 7231 is greater than or equal to 1 mm and less than or equal to 2 mm. In this way, it is possible to ensure that a water flow of appropriate strength is stably ejected from the first connecting hole 7231, so that the filter module 300 can be subjected to an impact force of appropriate magnitude, which is beneficial to ensuring the structural stability of the filter module 300 while ensuring the flushing effect on the filter module 300. Of course, in other embodiments, on the premise of ensuring that a suitable jet of water can be formed, the width of the first connecting hole 7231 can also be less than 1 mm or greater than 2 mm.

[0239] Furthermore, there are a plurality of the first connecting holes 7231 distributed in the circumferential direction. In this way, the coverage of the filter structure by the jetted water flow in the circumferential direction can be ensured, thereby ensuring the flushing effect on the filter module 300. Moreover, it is also conducive to forming a uniform jetted water flow in the circumferential direction, so that the filter structure can be subjected to a uniform impact force in the axial direction, thereby ensuring the structural stability of the filter assembly 30.

[0240] In one embodiment, the first communication hole 7231 penetrates the peripheral wall of the hollow tube section 723 along the tangential direction of the inner peripheral surface of the hollow tube section 723. In this way, the water flow can be guided by the inner peripheral surface of the hollow tube section 723 to reduce the resistance of the water flow, and a vortex can be formed, so that the filter module 300 can be more fully rinsed. Of course, in other embodiments, the first communication hole 7231 can also penetrate the peripheral wall of the hollow tube section 723 in the radial direction.

[0241] In one embodiment, the first connecting hole 7231 is gradually expanded in the penetration direction from the inside to the outside. In this way, the ejection pressure of the water flow can be increased, thereby improving the flushing effect of the water flow on the filter module 300. Of course, in other embodiments, the first connecting hole 7231 can also be gradually contracted and expanded in the penetration direction from the inside to the outside, which is conducive to increasing the flow rate of the water flow.

[0242] In one embodiment, the first connecting hole 7231 is arranged in an arc shape in the penetration direction, so as to further enhance the effect of the swirl flow and thus further enhance the flushing effect of the filter module 300. Of course, in other embodiments, the first connecting hole 7231 may also be arranged straight in the penetration direction.

[0243] In one embodiment, the inner circumference of the hollow tube section 723 is formed with a plurality of arc segments corresponding to the first connecting hole 7231, and the plurality of arc segments are sequentially tangently connected in the water outlet direction of the corresponding first connecting hole 7231, and the radius increases sequentially. That is, in the water outlet direction of the corresponding first connecting hole 7231, the curvature of the plurality of arc segments gradually decreases, so that the water flow can be gradually guided to exit the first connecting hole 7231 through the plurality of arc segments, so that the exiting water flow of the first connecting hole 7231 can be transformed into a vortex flow, and it is beneficial for the water flow to maintain a certain centrifugal force, so that the exiting water flow of the first connecting hole 7231 is easier to diverge, thereby ensuring the comprehensive flushing of the filter module 300. In addition, the two connected arc segments are tangent to each other, which can avoid the formation of local losses and affect the formation of vortex flow. In addition, when a plurality of first connecting holes 7231 are provided in the circumferential direction of the hollow tube section 723, among the plurality of arc segments corresponding to two adjacent connecting holes, the arc segment with the largest curvature corresponding to one first connecting hole 7231 will be arranged adjacent to the arc segment with the smallest curvature corresponding to the other first connecting hole 7231, and both are located near the previous first connecting hole 7231. However, the curvature difference between the two arc segments is very large, and the water flow will not be guided to the arc segment corresponding to the next first connecting hole 7231, but can smoothly flow out through the previous first connecting hole 7231. In other embodiments, it is also possible that a gradually changing curvature arc segment is formed corresponding to a first connecting hole 7231, that is, the curvature of the arc segment gradually decreases in the direction approaching the corresponding first connecting hole 7231.

[0244] Further, the inner circumference of the hollow tube section 723 is formed with a first arc section 7233 and a second arc section 7234 corresponding to the first connecting hole 7231, the first arc section 7233 and the second arc section 7234 are sequentially tangently connected in the water outlet direction of the corresponding first connecting hole 7231, and the radius increases sequentially, and the central axis of the first arc section 7233 is the central axis of the hollow tube section 723. That is, the curvature of the second arc section 7234 is smaller than the curvature of the first arc section 7233, and the second arc section 7234 is flatter than the first arc section 7233, so that two differentiated arc sections can be formed by the first arc section 7233 and the second arc section 7234, so as to ensure the formation effect of the swirl, and the first arc section 7233 is used as the starting point for the water flow to form the swirl, and its central axis is the central axis of the hollow tube section 723, which can better guide the water flow. Of course, in other embodiments, other numbers of arc segments, such as three or four, may be formed corresponding to a first connecting hole 7231 .

[0245] It should be noted that the multiple indicated in this solution, unless otherwise specified, should be understood as greater than or equal to two.

[0246] The present invention also proposes a water system, which includes a pre-filter. The specific structure of the pre-filter refers to the above embodiment. Since the water system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the water system at least includes related components from the pre-filter to the water end. For example, the water system can include household appliances such as water heaters, dishwashers, and water dispensers, and can also include accessories such as water pipes for domestic water in the whole house.

[0247] 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: A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet connected to the water filter cavity, and a sewage outlet connected to the water filter cavity is provided on a side of the filter bottle away from the valve head; A filter assembly is arranged in the water filter cavity, the filter assembly includes a filter module, a water passage cavity is formed inside the filter module, a first water passage port communicating with the water passage cavity is arranged in the axial direction of the filter module, a second water passage port communicating with the water passage cavity is arranged in the circumferential direction of the filter module, the filter module includes a filter element arranged at the second water passage port, and the filter element is at least partially arranged in an inclined manner; and The reversing member is hollow, the inner circumference of the reversing member is connected to the water outlet and the water filter chamber, the reversing member includes a connecting portion and a blocking portion, the reversing member can be movably inserted in the filter assembly so that the pre-filter can switch between a filtering mode and a flushing mode, and the flushing flow path between the water inlet and the reversing member is connected through the connecting portion and cut off through the blocking portion.

2. The pre-filter according to claim 1, characterized in that: The filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, and each of the support frames is provided with the second water passage port.

3. The pre-filter according to claim 2, characterized in that: The support frame includes an oblique support portion, and the two ends of the oblique support portion are respectively connected to a first ring portion and a second ring portion, the two oblique support portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique support portion.

4. The pre-filter according to claim 3, characterized in that: The oblique support portion is formed with a plurality of the second water outlets which are distributed at intervals. The filter module is provided with a filter element corresponding to each of the support frames. The filter element is stacked on the surface of the oblique support portion.

5. The pre-filter according to claim 4, characterized in that: The outer diameter of the second ring portion is greater than the outer diameter of the first ring portion.

6. The pre-filter according to claim 4, characterized in that: Each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

7. The pre-filter according to claim 1, characterized in that: The valve head is provided with a water isolating ring between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolating ring, the water outlet is connected to the inner peripheral side of the water isolating ring, the connecting part and the blocking part are distributed axially, and the reversing member is axially movably inserted in the water isolating ring and the filter assembly.

8. The pre-filter according to claim 7, characterized in that: The filter assembly includes a water distributor, which is located at one end of the filter assembly close to the water isolation ring. The water isolation ring and the water distributor are jointly constructed to form a water flow structure, and the water flow structure is connected to the water inlet; On the adjacent side of the water distributor and the water isolating ring, the water passing structure is isolated from the connecting portion in the filtering mode and is connected to the connecting portion in the flushing mode.

9. The pre-filter according to claim 8, characterized in that: The water isolation ring and the water distributor are arranged at intervals, and the water passing structure is the interval between the water isolation ring and the water distributor; In the filtering mode, the baffle is at least located between the water isolation ring and the water distributor; In the flushing mode, the connecting portion is at least partially located between the water isolation ring and the water distributor.

10. The pre-filter according to claim 7, characterized in that: The filter assembly also includes a water distributor connected to the axial side of the filter module, the water distributor has a first water flow space corresponding to the first water flow port and a second water flow space corresponding to the second water flow port, the second water flow space is provided with a guide vane, and the reversing member extends into the water flow chamber through the first water flow space.

11. The pre-filter according to claim 10, characterized in that: The reversing member also includes a hollow pipe section, a peripheral wall of which is provided with a first connecting hole, the connecting portion, the blocking portion and the hollow pipe section are sequentially distributed along the axial direction, the connecting portion is plug-fitted with the water isolation ring, the blocking portion is plug-fitted with the water distributor, and the hollow pipe section extends into the water passage chamber.

12. The pre-filter according to claim 11, characterized in that: The first communicating hole is configured as a strip-shaped hole extending in the axial direction; And / or, the first communication hole penetrates the peripheral wall of the hollow tube segment along the tangential direction of the inner peripheral surface of the hollow tube segment; And / or, the first connecting hole is arranged in an arc shape in the penetration direction; And / or, the first connecting hole is gradually expanded in the penetration direction from the inside to the outside.

13. The switching element according to claim 11, characterized in that: The inner circumference of the hollow tube section is formed with a plurality of arc segments corresponding to the first connecting hole. The plurality of arc segments are sequentially tangently connected in the water outlet direction of the corresponding first connecting hole, and the radius increases sequentially.

14. The commutator according to claim 13, characterized in that: The inner circumference of the hollow pipe section is formed with a first arc segment and a second arc segment corresponding to the first connecting hole. The first arc segment and the second arc segment are tangentially connected in sequence in the water outlet direction of the corresponding first connecting hole, and the radius increases successively. The central axis of the first arc segment is the central axis of the hollow pipe section.

15. The pre-filter according to claim 11, characterized in that: The outer periphery of the hollow tube section and the inner periphery of the filter assembly are sealed and matched, and the matching point between the two is located at one end of the first communicating hole away from the blocking portion.

16. The pre-filter according to claim 15, characterized in that: The filter assembly also includes an end cover, which includes a cylindrical portion and a limiting ring portion arranged around the cylindrical portion, the limiting ring portion is connected to the side of the filter module away from the water distributor, the cylindrical portion is inserted into the water passage cavity, and the outer periphery of the hollow pipe section and the inner periphery of the cylindrical portion are sealed and matched.

17. The pre-filter according to claim 1, characterized in that: The switching member is connected to an elastic member, and under the action of the elastic member, the switching member can be maintained at a position corresponding to the filtering mode.

18. The pre-filter according to claim 17, characterized in that: The filter assembly comprises a water distributor, the water distributor is located at one end of the filter assembly close to the water inlet, and the elastic member is installed between the reversing member and the water distributor.

19. The pre-filter according to claim 18, characterized in that: The barrier portion includes an annular main body portion extending along the axial direction of the switching member, and a barrier skirt edge arranged around the outer circumference of the annular main body portion, and one end of the elastic member is located at the inner side of the annular main body portion.

20. The pre-filter according to claim 19, characterized in that The inner periphery of the annular main body is further provided with a water passing portion, and the water passing portion is provided with a second communicating hole. In the filtering mode, the inner periphery of the water passing portion is connected to the inner periphery of the filtering assembly through the second communicating hole; The water distributor is provided with a blocking portion, and in the flushing mode, the blocking portion blocks the communication between the inner periphery of the water passing portion and the inner periphery of the filter assembly.

21. The pre-filter according to claim 20, characterized in that: One end of the elastic member is sleeved on the water passing portion, and the other end is sleeved on the blocking portion.

22. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an outer frame, which is rotatably sleeved outside the filter assembly. The outer frame includes a side frame and a bottom plate, and the bottom plate is connected to the side frame and is located away from the valve head.

23. The pre-filter according to claim 22, characterized in that The outer frame forms a siphon flow channel, the side frame is provided with a siphon hole connected to the siphon flow channel, the chassis is provided with a first discharge port connected to the siphon flow channel, and the first discharge port is connected to the sewage outlet at least in the flushing mode.

24. The pre-filter according to claim 23, characterized in that An impeller assembly is also provided in the water filter chamber, and the impeller assembly includes a mounting seat and an impeller body rotatably mounted on the mounting seat, the impeller body is coaxially connected to the exoskeleton and fixed in the circumferential direction, the mounting seat is formed with a connected water inlet and a drain, the water inlet includes a first water inlet connected to the first discharge port, and the drain is connected to the sewage outlet.

25. The pre-filter according to claim 24, characterized in that The water inlet further comprises a second water inlet, wherein the first water inlet is arranged on one axial side of the mounting seat, and the second water inlet is arranged on a circumferential side of the mounting seat; The chassis is also provided with a second discharge port extending axially therethrough, and a water retaining structure is formed on opposite sides of the exoskeleton and the mounting seat. The water retaining structure is arranged around the first discharge port, and the second discharge port is located at the periphery of the water retaining structure. The second water inlet is connected to the second discharge port.

26. The pre-filter according to claim 24, characterized in that The reversing member is also transmission-connected to a movable member, and the movable member includes a blocking portion, and the blocking portion is located on a side of the outer frame away from the valve head, and the blocking portion can detachably block at least one of the water inlet and the drain outlet; In the filtering mode, the blocking portion blocks at least one of the water inlet and the drain outlet; in the flushing mode, both the water inlet and the drain outlet are open.

27. The pre-filter according to claim 26, characterized in that The pre-filter also includes a reversing bottom shell, which is fixedly connected to the mounting seat. The reversing bottom shell and the outer frame are respectively located on both axial sides of the mounting seat. The blocking portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

28. The pre-filter according to claim 27, characterized in that The outer periphery of the sealing portion is sleeved with a sealing ring so as to seal and cooperate with the inner peripheral wall of the reversing bottom shell through the sealing ring.

29. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an exoskeleton, which is provided with a water flow driving member. The water flow driving member has a driving surface, and the driving surface is arranged at an angle relative to the circumference of the exoskeleton, so that the driving surface can drive the exoskeleton to rotate after being impacted by the water flow.

30. The pre-filter according to claim 29, characterized in that The water flow driving component includes a hanging part and a driving body, the hanging part is hung on the end of the outer frame close to the water inlet, the driving body is arranged in a conformal manner with the inner circumferential wall of the outer frame, the driving body extends along the circumferential arc of the outer frame, and has a plurality of water baffles distributed at intervals, and the driving surface is formed on the water baffles.

31. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an exoskeleton, the exoskeleton is equipped with a cleaning structure, the cleaning structure includes an inner cleaning brush protruding from the inner circumference of the exoskeleton, the inner cleaning brush includes a cleaning portion, the cleaning portion extends in the axial direction of the exoskeleton, the cleaning portion is arranged corresponding to the filter element, and the cleaning portion is used to clean the filter element.

32. The pre-filter according to claim 31, characterized in that The cleaning portion extends along the circumference of the outer frame and is inclined relative to the axial direction of the outer frame; And / or, the cleaning portion is configured as a sheet-like structure; And / or, the side portion of the cleaning portion distributed in the axial direction of the outer skeleton is inclined.

33. The pre-filter according to claim 31, characterized in that The cleaning parts are distributed in a plurality in the axial direction of the outer frame, one cleaning part is arranged corresponding to one filter element, and two adjacent cleaning parts are arranged at an acute angle; And / or, the inner cleaning brush further comprises a base portion, the base portion is protrudingly arranged on the inner circumference of the outer frame, and the cleaning portion is connected to the outer circumference of the base portion.

34. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 33.

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