Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water consuming system, and relates to the technical field of filters, the pre-filter comprises a shell, a filter assembly, an outer framework and a reversing piece, the shell is provided with a water filtering cavity, a water inlet, a water outlet and a sewage draining exit, the water inlet, the water outlet and the sewage draining exit are communicated with the water filtering cavity, and the filter assembly is arranged in the water filtering cavity; the outer framework is arranged in the water filtering cavity and provided with a siphon flow channel, a siphon hole communicated with the siphon flow channel and a first discharging opening, and the first discharging opening is communicated with the sewage draining opening. The reversing piece is hollow, the inner circumferential side of the reversing piece is communicated with the water outlet and the water filtering cavity, the reversing piece comprises a communicating part and a blocking part, the reversing piece is movably arranged in the water filtering cavity, so that the prefilter can be switched between a filtering mode and a flushing mode, and a flushing flow path between the water inlet and the reversing piece is communicated through the communicating part and is separated through the blocking part. According to the technical scheme, the filtering effect of the filtering assembly can be 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, which is equipped with a filter assembly and other components inside, 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 assembly, which will clog the filter assembly over time and reduce the filtering effect of the filter assembly. 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] The housing has a water filter cavity, and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity, wherein the water inlet is connected to the water supply end, and the water outlet is connected to the water use end;

[0006] A filter assembly is arranged in the water filter chamber;

[0007] an outer frame, arranged in the water filter cavity, and provided with a siphon flow channel, a siphon hole and a first discharge port respectively connected to the siphon flow channel, wherein the first discharge port is connected to the sewage outlet; and

[0008] 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 arranged in the water filter chamber 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 blocked by the blocking portion.

[0009] In one embodiment, the shell 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, and the water outlet is connected to the inner peripheral side of the water-isolating ring; the pre-filter also includes a water distributor, the water distributor is provided at one end of the filter assembly close to the water-isolating ring, and the water distributor forms a water flow space connected to the water filter chamber; in the filtering mode, on the adjacent side of the water distributor and the water-isolating ring, the water inlet is connected to the water flow space, and the water inlet and the inner peripheral side of the reversing member are separated; in the flushing mode, on the adjacent side of the water distributor and the water-isolating ring, the water inlet is connected to the inner peripheral side of the reversing member through the connecting portion, and the blocking portion separates the water inlet and the water flow space.

[0010] In one embodiment, the water-isolating ring and the water distributor jointly form a water-passing structure, and the water-passing structure is connected to the water inlet; on the adjacent side of the water distributor and the water-isolating ring, in the filtering mode, the water-passing structure is separated from the connecting part, and in the flushing mode, the water-passing structure is connected to the connecting part.

[0011] In one embodiment, the water isolating ring and the water distributor are integrally formed, and the water passing structure is a through hole provided at the connection between the water isolating ring and the water distributor.

[0012] In one embodiment, the water isolating ring and the water distributor are formed separately, and the water isolating ring and the water distributor are abutted against each other and assembled to form a through hole.

[0013] In one embodiment, the water isolating ring and the water distributor are formed separately, and the water passing structure is the interval between the water isolating ring and the water distributor.

[0014] In one embodiment, the water-isolating ring and the water distributor are spaced apart, and the connecting portion and the blocking portion are distributed axially; in the filtering mode, the blocking portion is at least located between the water-isolating ring and the water distributor, so that the water inlet is connected to the water flow space; in the flushing mode, the connecting portion is at least partially located between the water-isolating ring and the water distributor, so that the connecting portion is connected to the water inlet, and the blocking portion blocks the water flow space.

[0015] In one embodiment, the barrier portion includes an annular main body extending along the axial direction of the reversing member, and a barrier skirt arranged on the outer periphery of the annular main body, the water distributor is provided with a mounting ring groove connected to the inner periphery of the filter assembly, the water flow space is arranged on the outer peripheral side of the mounting ring groove, and the annular main body is slidably inserted in the mounting ring groove; in the flushing mode, the barrier skirt covers the water flow space.

[0016] In one embodiment, a water passing portion is further provided on the inner periphery of the annular main body portion, a second connecting hole is provided on the peripheral wall of the water passing portion, and a blocking portion is provided on the bottom of the mounting ring groove; in the filtering mode, a gap is arranged between the water passing portion and the blocking portion so that the second connecting hole is connected to the inner periphery of the filter assembly; in the flushing mode, the blocking portion blocks the connection between the second connecting hole and the inner periphery of the filter assembly.

[0017] In one embodiment, the switching member includes a switching section and a hollow pipe section connected in sequence along the axial direction, the switching section includes the connecting portion and the blocking portion, the hollow pipe section is inserted in the filter assembly, and the peripheral wall of the hollow pipe section is provided with a first connecting hole, and the flushing flow path between the first connecting hole and the water inlet is connected through the connecting portion and blocked by the blocking portion.

[0018] In one embodiment, the filter assembly includes a plurality of filter elements distributed along the axial direction, a plurality of first connecting holes are provided, and are configured to form a jet of water toward the filter elements. In the flushing mode, the first connecting holes are arranged axially corresponding to the filter elements.

[0019] In one embodiment, the pre-filter also includes a movable part, which is movably disposed in the water filter chamber so that the pre-filter can switch between a filtering mode and a flushing mode. The water inlet, the water outlet and the first discharge port are disposed on one side of the movable part, and the sewage outlet is disposed on the other side of the movable part. The spaces on the opposite sides of the movable part are isolated in the filtering mode and connected in the flushing mode.

[0020] In one embodiment, the movable member is transmission-connected to the reversing member.

[0021] In one embodiment, under the action of water pressure, the movable part switches between different positions corresponding to the filtering mode and the flushing mode, and at least one of the movable part and the reversing part is connected to an elastic part, so that the movable part and the reversing part can naturally maintain the positions corresponding to the filtering mode.

[0022] In one embodiment, the pre-filter also includes a water distributor, which is arranged at one end of the filter assembly close to the water inlet, and the water distributor forms a water flow space connected to the water filter chamber, and the elastic member is installed between the reversing member and the water distributor; the barrier portion includes an annular main body extending along the axial direction of the reversing member, and a barrier skirt arranged on the outer periphery of the annular main body, and the barrier skirt covers the water flow space in the flushing mode, and one end of the elastic member is located on the inner side of the annular main body.

[0023] In one embodiment, the water distributor is provided with a mounting ring groove connected to the inner circumference of the filter assembly, the water flow space is arranged on the outer circumferential side of the mounting ring groove, the reversing member is slidably inserted in the mounting ring groove, and one end of the elastic member is inserted into the mounting ring groove.

[0024] In one embodiment, the movable member is fixedly connected to the reversing member, and the elastic member is arranged on a side of the movable member close to the sewage outlet.

[0025] In one embodiment, the movable part includes a sealing portion, the water inlet and the sewage outlet are respectively arranged on two axial sides of the sealing portion, a first flow port is provided between the water inlet and the sewage outlet, and the sealing portion is provided with a second flow port, the second flow port and the first flow port are staggered, and the axial side surface of the sealing portion can be detachably sealed from the first flow port.

[0026] In one embodiment, a mounting protrusion is protrudingly provided on one side of the blocking portion close to the sewage outlet, and the elastic member is sleeved on the mounting protrusion.

[0027] In one embodiment, the shell includes a sewage discharge assembly, the sewage discharge port is formed in the sewage discharge assembly, the sewage discharge assembly includes a sewage discharge valve, the elastic member is located between the movable member and the sewage discharge valve, and the two ends of the elastic member are respectively abutted against the movable member and the sewage discharge assembly.

[0028] In one embodiment, the pre-filter further includes a driving member, which is drivingly connected to the reversing member and exposed outside the housing.

[0029] In one embodiment, the driving member includes a driving screw, one of the housing and the switching member is rotatably connected to the driving screw and axially fixed, and the other of the housing and the switching member is threadedly connected to the driving screw via a screw connection structure.

[0030] In one embodiment, the screw connection structure is configured as a mounting bracket fixedly disposed in the reversing member, the driving screw is screwed to the mounting bracket, and is rotatably connected to the housing and fixed in the axial direction.

[0031] In one embodiment, the driving member further includes a driving knob, which is fixed to the driving screw and located outside the housing.

[0032] In one embodiment, the movable part includes a blocking portion, and the pre-filter is further provided with a sewage discharge channel connected to the sewage discharge port. The blocking portion blocks the sewage discharge channel in the filtering mode and opens the sewage discharge channel in the flushing mode.

[0033] In one embodiment, the sewage discharge channel has a first channel and a second channel coaxially connected, and the first channel is located on a side close to the water filter chamber; the movable part also includes a avoidance portion, and the avoidance portion is connected to a side of the blocking portion close to the water filter chamber; in the filtering mode, the blocking portion blocks the first channel, and in the flushing mode, the blocking portion is in the second channel and is gapped with the second channel, and the avoidance portion passes through the first channel and is gapped with the first channel.

[0034] In one embodiment, the filter assembly includes a filter module, a water flow cavity is formed inside the filter module, a first water flow port connected to the water flow cavity is provided in the axial direction of the filter module, a second water flow port connected to the water flow cavity is provided in the circumferential direction of the filter module, the filter module includes a filter element arranged at the second water flow port, and the siphon hole is arranged corresponding to the filter element.

[0035] In one embodiment, the filter module is provided with multiple axially, and two adjacent filter modules are connected through the first water outlet. The outer skeleton is sleeved on the outside of the filter component, and the siphon flow channel includes a side wall flow channel extending along the axial direction and located on the outside of the filter component. The side wall flow channel is provided with multiple siphon holes at intervals along the axial direction, and one siphon hole corresponds to at least one filter element.

[0036] In one embodiment, the siphon flow channel further includes a bottom flow channel connected to the side wall flow channel and extending radially, and the bottom flow channel is provided with the first discharge port and is located on a side of the filter assembly close to the sewage discharge port.

[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 water inlet and a drain, the water inlet is connected to the first discharge port, and the drain is connected to the sewage outlet.

[0038] In one embodiment, the water inlet includes a first water inlet and 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 the circumferential side of the mounting seat; the exoskeleton is also provided with a second discharge port, and a water retaining structure is formed on the 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 on the outer periphery of the water retaining structure; the first water inlet is connected to the first discharge port, and the second water inlet is connected to the second discharge port.

[0039] The present invention also provides a water use system, comprising the aforementioned pre-filter.

[0040] In the embodiment of the present invention, the pre-filter is of backwash type, and the reversing member is switched between different positions, so that the pre-filter can form a filtering flow path and a flushing flow path in the filtering mode and the flushing mode respectively, and can effectively ensure the working performance of the pre-filter in different working modes. Among them, in the flushing mode, the pre-filter can regularly clean the impurities attached to the filter assembly through the flushing flow path, thereby ensuring the filtering effect of the filter assembly and prolonging the service life of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 A cross-sectional view of the first embodiment of the pre-filter provided by the present invention, corresponding to the flushing mode;

[0043] Figure 2 for Figure 1 Another cross-sectional view of the illustrated embodiment, corresponding to the flushing mode;

[0044] Figure 3 for Figure 1 A partial enlarged view of the middle A;

[0045] Figure 4 for Figure 2 A partial enlarged view of point E in the middle;

[0046] Figure 5 for Figure 1 A structural schematic diagram of a moving part in;

[0047] Figure 6 for Figure 5 Another structural schematic diagram of the movable part shown;

[0048] Figure 7 for Figure 1 A partial enlarged view of point B in the middle;

[0049] Figure 8 for Figure 2 A partial enlarged view of point D in the middle;

[0050] Fig. 9 for Figure 1 A structural schematic diagram of the commutating member in FIG.

[0051] Fig.10 for Fig. 9Another structural schematic diagram of the commutator shown;

[0052] Fig.11 for Fig. 9 Another structural schematic diagram of the commutating member shown;

[0053] Fig.12 for Figure 1 A partial enlarged view of point C in the middle;

[0054] Fig.13 for Figure 1 A structural schematic diagram of an impeller assembly in FIG.

[0055] Fig.14 for Fig.13 Another structural schematic diagram of the impeller assembly shown;

[0056] Fig.15 for Fig.13 A schematic diagram of the internal structure of the impeller assembly shown;

[0057] Fig.16 for Figure 1 Schematic diagram of the skeleton structure in ;

[0058] Fig.17 A schematic diagram of the structure of the second embodiment of the pre-filter provided by the present invention, corresponding to the flushing mode;

[0059] Fig.18 for Fig.17 A partial enlarged view of point F in the middle;

[0060] Fig.19 for Fig.17 Installation diagram of the moving parts, reversing parts and water distributor;

[0061] Fig. 20 A schematic structural diagram of a third embodiment of a pre-filter provided by the present invention;

[0062] Fig.21 for Fig. 20 A cross-sectional view of the illustrated embodiment corresponds to the flushing mode;

[0063] Fig. 22 for Fig.21 A partial enlarged view of the G in the middle;

[0064] Fig.23 for Fig. 22 Schematic diagram of the structure shown in filtering mode;

[0065] Fig.24 for Fig.21 Installation diagram of the moving parts, reversing parts and driving parts;

[0066] Fig.25 for Fig.21 Schematic diagram of the installation of the movable parts and the mounting bracket;

[0067] Fig.26 for Fig.21 A partial enlarged view of the H in the middle;

[0068] Fig. 27 for Fig.26 Schematic diagram of the structure shown in filtering mode.

[0069] Description of Figure Numbers:

[0070] 10, filter bottle; 101, water filter chamber; 102, sewage outlet; 104, first flow outlet; 140, sewage channel; 141, first channel; 142, second channel;

[0071] 20. Valve head; 201. Water inlet; 202. Water outlet; 203. Water isolation ring; 22. Metal outer shell; 23. Plastic lining;

[0072] 30, filter assembly; 300, filter module; 301, end cover; 320, filter element; 330, first water outlet; 340, water chamber; 350, second water outlet;

[0073] 40, impeller assembly; 401, impeller chamber; 402, first water inlet; 403, second water inlet; 404, drain outlet; 410, mounting seat; 424, water retaining ring; 440, impeller body; 441, impeller shaft; 442, blades; 443, second protrusion;

[0074] 50, outer frame; 501, siphon flow channel; 501a, side wall flow channel; 501b, bottom flow channel; 503, first discharge port; 504, second discharge port; 511, chassis; 512, side frame; 514, first protrusion; 515, water retaining ring; 531, siphon hole;

[0075] 60, water distributor; 601, water flow space; 602, mounting ring groove; 604, blocking part;

[0076] 710, reversing bottom shell; 711, sealing ring surface; 720, reversing member; 721, connecting part; 722, blocking part; 7221, annular main body; 7222, blocking skirt; 7224, water passing part; 7225, second connecting hole; 723, hollow pipe section; 7231, first connecting hole; 730, movable member; 731, blocking part; 7311, second flow opening; 7312, mounting convex part; 732, connecting part; 733, avoidance part; 740, mounting bracket; 741, inner ring part; 742, outer ring part; 743, connecting arm; 744, clamping convex part; 745, connecting rib; 750, driving member; 751, driving screw; 752, driving knob;

[0077] 80. sewage discharge assembly; 820. sewage discharge valve;

[0078] 1001. Fastener; 1002. Sealing ring; 1003. Elastic member; 1004. Water retaining structure.

[0079] 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

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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, which is equipped with a filter assembly and other components inside, 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 assembly, which will clog the filter assembly over time and reduce the filtering effect of the filter assembly.

[0084] The present invention proposes a pre-filter, the internal components of which can realize the switching of internal flow channels, so that the internal filter components can be cleaned regularly to discharge the large particulate matter previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter, thereby increasing the service life of the pre-filter.

[0085] 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.

[0086] See also Figure 1 In one embodiment of the present invention, the pre-filter includes a housing having a water filter chamber 101, and a water inlet 201 and a water outlet 202 connected to the water filter chamber 101. The housing is usually formed in separate parts, so the housing includes a filter bottle 10 and a valve head 20 connected to the filter bottle 10, the water filter chamber 101 is at least provided in the filter bottle 10, and the water inlet 201 and the water outlet 202 are both provided in the valve head 20. 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, so as to filter the raw water flowing from the water supply end to the water use end.

[0087] It should be noted that the water supply end can be a tap, a water tower or 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.

[0088] The connection between the valve head 20 and the filter bottle 10 can be threaded, for example, the valve head 20 is provided with an external threaded tube, and the bottle 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.

[0089] See also Figure 7In some embodiments, the valve head 20 may include a metal shell 22 and a plastic lining 23 connected to each other, and the water inlet 201 and the water outlet 202 are formed on the plastic lining 23. In this way, the water flowing through the pre-filter directly contacts the plastic lining 23 instead of the metal shell 22, which can avoid the problem of water being contaminated by metal elements precipitated from the metal shell 22, and make the pre-filter have good aesthetics and shell strength.

[0090] The material of the metal shell portion 22 and the plastic lining portion 23 is not specifically limited in this application. For example, the material of the metal shell portion 22 can be a copper alloy, such as brass, and the material of the plastic lining portion 23 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0091] See also Figure 1 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, which can provide better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., and reduce the risk of damage to these devices due to clogging by impurities.

[0092] See also Figures 1 to 4 In some embodiments, the bottom end of the housing (the end away from the water inlet 201) is usually provided with a sewage outlet 102, which corresponds to different working modes of the pre-filter and can be switched between open and closed. For example, in one embodiment, the housing further includes a sewage outlet assembly 80, which is installed on the side of the filter bottle 10 away from the valve head 20, and the sewage outlet assembly 80 is formed with a sewage outlet channel, and the sewage outlet channel is provided with a sewage outlet 102 on the side close to the valve head 20. Among them, the sewage outlet assembly 80 may include a sewage outlet valve 820, and the sewage outlet channel is interrupted or connected by the sewage outlet valve 820. The pre-filter is usually a "T"-shaped structure, the "horizontal" position on the top corresponds to the valve head 20, the left and right ends are the water inlet 201 and the water outlet 202 respectively, and the "vertical" main body on the bottom is the filter bottle 10, which is used to install the filter assembly 30, and the axial direction of the water filter chamber 101 corresponds to the extension direction of this "vertical".

[0093] See also Figure 1 and Fig.10In some embodiments, the pre-filter further comprises an exoskeleton 50, which is arranged in the water filter chamber 101 and is provided with a siphon channel 501, a siphon hole 531 respectively connected to the siphon channel 501, and a first discharge port 503, wherein the first discharge port 503 is connected to the sewage outlet 102. Thus, by arranging the siphon channel 501 and the siphon hole 531 on the exoskeleton 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 discharged more efficiently. That is, the impurities, particles, etc. intercepted by the filter assembly 30 can be more effectively guided to the sewage outlet 102 more quickly and effectively during the flushing stage, and finally discharged through the sewage outlet 102, thereby improving the flushing effect of the water filter chamber 101, especially the filter assembly 30. Thus, the flushing of the filter assembly 30 can be achieved to ensure the filtering effect of the filter assembly 30 and improve the service life of the pre-filter.

[0094] See also Figure 1 and Figure 5 In some embodiments, the pre-filter further 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 disposed in the water filter chamber 101 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 blocked by the blocking portion 722.

[0095] 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 through the filter assembly 30 is opposite. The water flow direction is achieved by switching the reversing member 720 between two positions corresponding to the filtering mode and the flushing mode.

[0096] Please also read Figure 1 and Figure 7 In the filtering mode, the water outlet 202 is open and the sewage outlet 102 is closed. When the reversing member 720 moves to a position corresponding to the filtering mode, the position of the baffle 722 can avoid the filtering flow path between the water inlet 201 and the water flow space 601, 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 water flow space 601 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 water flow space 601 to the filter assembly 30 for filtering, and flow from the outside to the 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.

[0097] Please also read Figure 2 and Figure 8 In the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened. When the reversing member 720 moves to the position corresponding to the flushing mode, the position of the blocking portion 722 can separate the water inlet 201 and the water flow space 601, so as 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, so as 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.

[0098] In summary, the technical solution of the present invention can change the connectivity 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 water filter chamber 101, thereby enabling the pre-filter to switch between the filtering mode and the flushing mode, and realizing self-flushing of the internal filtering assembly 30 of the pre-filter, thereby eliminating the need for manual disassembly and cleaning, facilitating the cleaning of the pre-filter, and thereby increasing the service life of the pre-filter.

[0099] That is, by switching the reversing member 720 between different positions, the pre-filter can form a filtering flow path and a flushing flow path in the filtering mode and the flushing mode, respectively, and can effectively ensure the working performance of the pre-filter in different working modes. In the flushing mode, the pre-filter can regularly clean the impurities attached to the filter assembly 30 through the flushing flow path, thereby ensuring the filtering effect of the filter assembly 30 and improving the service life of the pre-filter.

[0100] Of course, in other embodiments, the pre-filter may also be set to a forward flushing type, and the relevant technology is relatively mature, so this application will not elaborate on it. The following will take the backwashing pre-filter as an example to further explain the technical solution.

[0101] Optionally, the connecting portion 721 and the blocking portion 722 are integrally formed on the switching member 720, which not only facilitates the assembly of the switching member 720, but also ensures the overall strength of the switching member 720, and avoids the possibility of an installation gap between the connecting portion 721 and the blocking portion 722, which may cause accidental water seepage into the switching member 720 and cause water flow turbulence.

[0102] See also Figure 1 and Figure 7Furthermore, a water-isolating ring 203 is provided in the shell 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 203, and the water outlet 202 is connected to the inner peripheral side of the water-isolating ring 203; the pre-filter also includes a water distributor 60, which is arranged at one end of the filter assembly 30 close to the water-isolating ring 203, and the water distributor 60 forms a water-passing space 601 connected to the water filter chamber 101; in the filtering mode, on the adjacent side of the water distributor 60 and the water-isolating ring 203, the water inlet 201 is connected to the water-passing space 601, and the water inlet 201 and the inner peripheral side of the reversing member 720 are separated; in the flushing mode, on the adjacent side of the water distributor 60 and the water-isolating ring 203, the water inlet 201 is connected to the inner peripheral side of the reversing member 720 through the connecting portion 721, and the blocking portion 722 separates the water inlet 201 and the water-passing space 601.

[0103] Furthermore, the water-blocking ring 203 and the water distributor 60 together form a water-passing structure, which is connected to the water inlet 201; on the adjacent side of the water distributor 60 and the water-blocking ring 203, in the filtering mode, the water-passing structure is separated from the connecting part 721, and in the flushing mode, the water-passing structure is connected to the connecting part 721.

[0104] In some embodiments, the water-passing structure is formed by the water-isolating ring 203 and the water distributor 60. The reversing member 720 switches between different positions, which 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 203.

[0105] Please also read Figure 8 and Fig. 9 In the first embodiment, optionally, the water-isolating ring 203 and the water distributor 60 are spaced apart, the water-passing structure is the space between the water-isolating ring 203 and the water distributor 60, and the connecting portion 721 and the blocking portion 722 are distributed along the axial direction; in the filtering mode, the blocking portion 722 is at least located between the water-isolating ring 203 and the water distributor 60, so that the water inlet 201 is connected to the water-passing space 601; in the flushing mode, the connecting portion 721 is at least partially located between the water-isolating ring 203 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 water-passing space 601.

[0106] In this embodiment, the water passing structure is configured as the interval between the water isolation ring 203 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 203 and the water distributor 60.

[0107] When the blocking portion 722 is arranged relative to the interval between the water blocking ring 203 and the water distributor 60, the blocking portion 722 is at least located between the water blocking ring 203 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 water space 601 to the water filter chamber 101, and in the water filter chamber 101, flows from the outer peripheral side of the filter component 30 to the inner peripheral side of the filter component 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.

[0108] When the connecting portion 721 is arranged relative to the interval between the water-isolating ring 203 and the water distributor 60, the connecting portion 721 is at least partially located between the water-isolating ring 203 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 water flow space 601, 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.

[0109] Among them, the direction from the connecting part 721 to the blocking part 722 can be the direction from the water isolation ring 203 to the water distributor 60, or it can be that the blocking part 722 includes two parts that block the water flow space 601 and the gap between the water isolation ring 203 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 water flow space 601 is on the side of the water distributor 60 away from the water isolation ring 203.

[0110] In other embodiments, the water passing structure can be configured as a through hole. In one embodiment, the water isolating ring 203 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 203 and the water distributor 60; in another embodiment, the water isolating ring 203 and the water distributor 60 are separately formed, and the water isolating ring 203 and the water distributor 60 are abutted and assembled to form a through hole.

[0111] 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 203 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.

[0112] See also Figure 7 and Figure 8 In the first embodiment, optionally, the water distributor 60 and the water-isolating ring 203 are arranged opposite to each other and spaced apart in the axial direction. In the filtering mode, the two axial sides of the baffle 722 are respectively connected to the water distributor 60 and the water-isolating ring 203 and spaced apart from the water-passing space 601. In the flushing mode, the connecting portion 721 is at least partially located between the water distributor 60 and the water-isolating ring 203 and covers the water-passing space 601. 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 baffle 722 on the adjacent side of the water distributor 60 and the water-isolating ring 203, and the water inlet 201 will also be connected to the water filter chamber 101 on this side through the water-passing space 601. 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-isolating ring 203.

[0113] In order to ensure the barrier effect of the barrier portion 722, in the embodiment of the present invention, please refer to Figures 7 to 9 The blocking portion 722 includes an annular main body portion 7221 extending axially along the reversing member 720, and a blocking skirt 7222 arranged on the outer periphery of the annular main body portion 7221. The water distributor 60 is provided with an installation annular groove 602 connected to the inner periphery of the filter assembly 30. The water flow space 601 is arranged on the outer peripheral side of the installation annular groove 602. The annular main body portion 7221 is slidably inserted into the installation annular groove 602. In the flushing mode, the blocking skirt 7222 covers the water flow space 601.

[0114] Specifically, the blocking portion 722 includes an annular main body 7221 extending along the axial direction of the reversing member 720, and the annular main body 7221 is used to connect with the connecting portion 721, so as to communicate with the inner circumference of the connecting portion 721. The water distributor 60 is provided with a mounting annular groove 602 connected to the inner circumference of the filter assembly 30, and the bottom of the mounting annular groove 602 is provided with a through hole (the inner circumference of the mounting annular groove 602) connected to the interior of the filter assembly 30. The annular main body 7221 is slidably inserted into the mounting annular groove 602. On the one hand, the annular main body 7221 can guide the sliding of the reversing member 720 relative to the water distributor 60. On the other hand, the annular main body 7221 is inserted into the mounting annular groove 602, which helps to block the through hole at the bottom of the mounting annular groove 602, so that the interior of the filter assembly 30 can only be connected to the inner circumference of the reversing member 720 through the through hole, and then connected to the water outlet 202, reducing the possibility of the through hole connecting to the water inlet 201.

[0115] The water flow space 601 is arranged around the outer peripheral side of the mounting annular groove 602, so the water flow space 601 is separated from the mounting annular groove 602, the mounting annular groove 602 is connected to the inner periphery of the filter assembly 30, and the water flow space 601 is connected to the outer peripheral space of the filter assembly 30. In addition, since a plurality of spiral flow channels are arranged in the water flow space 601 of the water distributor 60, a plurality of spaced and spirally arranged fan blades are arranged in the water flow space 601. In the flushing state, if the blocking portion 722 is directly inserted into the water flow space 601, it may interfere with the fan blades inside it. Therefore, a blocking skirt 7222 is arranged on the outer periphery of the annular main body 7221, and the blocking skirt 7222 is directly covered on the water inlet side of the water flow space 601, thereby blocking the water flow space 601. Of course, in other embodiments, a blocking structure adapted to the water flow space 601 is provided on the outer periphery of the annular main body 7221 , and the blocking structure is inserted into the water flow space 601 to block the water flow space 601 .

[0116] In an embodiment of the present invention, a water passing portion 7224 is further provided on the inner periphery of the annular main body portion 7221, a second connecting hole 7225 is provided on the peripheral wall of the water passing portion 7224, and a blocking portion 604 is provided on the bottom of the mounting ring groove 602; in the filtering mode, a gap is arranged between the water passing portion 7224 and the blocking portion 604 so that the second connecting hole 7225 is connected to the inner periphery of the filter assembly 30; in the flushing mode, the blocking portion 604 blocks the connection between the second connecting hole 7225 and the inner periphery of the filter assembly 30.

[0117] Specifically, the peripheral wall of the water-passing portion 7224 is provided with a second connecting hole 7225, so that the inner periphery of the filter assembly 30 can be connected to the second connecting hole 7225 through the gap between the water-passing portion 7224 and the annular main body 7221, thereby facilitating the filtered raw water to flow into the inner periphery of the reversing member 720. Figure 7), the water-passing portion 7224 is provided with a through-hole gap at the bottom of the mounting ring groove 602 to communicate with the inner periphery of the filter assembly 30; in the flushing mode (refer to Figure 8 ), the edge of the through hole can abut against the lower edge of the second connecting hole 7225 to eliminate the gap between the water passing portion 7224 and the bottom of the mounting ring groove 602, thereby blocking the connection between the second connecting hole 7225 and the inner periphery of the filter assembly 30.

[0118] In the flushing mode, the reversing member 720 sprays water to the inner periphery of the filter assembly 30 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 reversing member 720 is directly connected to the inner periphery of the filter assembly 30 to ensure the impact force of the water flow. In the flushing mode, the second connecting hole 7225 can increase the water flow area of ​​the water flow portion 7224, thereby increasing the water output from the inner periphery of the filter assembly 30.

[0119] The bottom of the mounting ring groove 602 is provided with a blocking portion 604 protruding inwardly. The blocking portion 604 can abut against the lower edge of the second communicating hole 7225 in the flushing state to block the communication between the second communicating hole 7225 and the inside of the filter assembly 30, thereby blocking the second communicating hole 7225 in the flushing state. If the blocking portion 604 blocks the communication between the second communicating hole 7225 and the inner periphery of the filter assembly 30 by blocking the second communicating hole 7225, once the circumferential offset occurs between the water distributor 60 and the reversing member 720, it may cause the blocking portion 604 to be unable to be smoothly inserted into the second communicating hole 7225, thereby causing the blocking portion 604 to fail. Therefore, the blocking portion 604 is arranged to abut against the lower edge of the second communicating hole 7225, thereby eliminating the gap between the water passing portion 7224 and the blocking portion 604 to block the water flow.

[0120] Please also read Figures 9 to 11 Furthermore, the reversing member 720 includes a switching section and a hollow pipe section 723 connected in sequence along the axial direction, the switching section includes a connecting portion 721 and a blocking portion 722, the hollow pipe section 723 is inserted into the filter assembly 30, and a first connecting hole 7231 is provided on the peripheral wall of the hollow pipe section 723. The flushing flow path between the first connecting hole 7231 and the water inlet 201 is connected through the connecting portion 721 and is blocked by the blocking portion 722.

[0121] Specifically, the first connecting hole 7231 connects the outside and the inside of the hollow pipe section 723. In the flushing mode, the water in the hollow pipe section 723 can flow to the outside of the hollow pipe section 723 through the first connecting hole 7231, that is, flow to the inside of the filter component 30, and then flow out to the outside of the filter component 30. In this process, impurities on the outer surface of the filter component 30 can be flushed off and finally flow to the sewage outlet 102.

[0122] Optionally, the filter assembly 30 includes a plurality of filter elements 320 distributed along the axial direction, and a plurality of first communication holes 7231 are provided, and are configured to form a jet of water toward the filter element 320. In the flushing mode, the first communication holes 7231 are arranged axially corresponding to the filter element 320. That is, the aperture of the first communication holes 7231 is small, so that the water in the hollow tube section 723 can have a large flow rate when flowing out through the first communication holes 7231, and form a jet of water to flush the filter element 320 more specifically, so that impurities on the outer surface of the filter element 320 are more easily removed. Of course, in other embodiments, the aperture of the first communication holes 7231 may not be set small.

[0123] The form and structure of the filter element 30 are not limited, and the filter element can be configured with a stainless steel filter or a PP cotton filter to filter impurities.

[0124] See also Figure 7 , Figure 8 , Fig.10 and Fig.11 Furthermore, the reversing member 720 further includes a water passing portion 7224, and the water passing portion 7224 is provided with a second connecting hole 7225 having an opening size larger than the first connecting hole 7231. In the filtering mode, the second connecting hole 7225 connects the water cavity 340 and the water outlet 202. In the filtering mode, the second connecting hole 7225 connects the inner periphery of the filter assembly 30. In the flushing mode, the connection between the second connecting hole 7225 and the inner periphery of the filter assembly 30 is blocked. In this way, on the one hand, the second connecting hole 7225 does not serve as a water passing structure in the flushing mode to prevent the water in the hollow pipe section 723 from flowing out from the second connecting hole 7225, thereby ensuring that the water in the hollow pipe section 723 can be fully ejected from the first connecting hole 7231. On the other hand, the second connecting hole 7225 serves as a water-passing structure in the filtering mode, and can cooperate with the first connecting hole 7231 to enable the water in the filtering assembly 30 to flow into the inner side of the hollow tube section 723 faster and more smoothly, so that the flow rate to the water outlet 202 is larger. Of course, in other embodiments, the second connecting hole 7225 may not be provided.

[0125] Specifically, there are multiple second connecting holes 7225, which are circumferentially spaced and distributed on the peripheral side wall of the water passing portion 7224. In this way, the total flow cross-sectional area of ​​the second connecting holes 7225 can be increased, which is conducive to allowing the water in the filter assembly 30 to flow into the inner side of the hollow tube section 723 faster and more smoothly.

[0126] See also Figure 1 and Figure 5 In some embodiments, further, the pre-filter also includes a movable part 730, and the movable part 730 can be movably arranged in the water filter chamber 101, so that the pre-filter can switch between the filtering mode and the flushing mode. The water inlet 201, the water outlet 202 and the first discharge port 503 are arranged on one side of the movable part 730, and the sewage outlet 102 is arranged on the other side of the movable part 730. The spaces on the opposite sides of the movable part 730 are separated in the filtering mode and connected in the flushing mode.

[0127] Specifically, see Figure 1 , Figure 3 and Figure 7 In the filtering mode, the water outlet 202 is opened and the sewage outlet 102 is closed. The raw water entering from the water inlet 201 enters the water filter chamber 101, is filtered by the filter component 30, and then 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 component 30 in the water filter chamber 101, thereby cleaning the impurities attached to the filter component 30, 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, the water filter chamber 101 and the sewage outlet 102 can be connected.

[0128] Among them, see Figure 1 and Figure 3 When the front filter is in the filtering mode, the water inlet 201, the water outlet 202 and the filter assembly 30 can be relatively concentratedly distributed on the same side of the movable part 730, so that the raw water can be filtered through the filter assembly 30 more efficiently.

[0129] In this embodiment, by switching between different positions of the movable member 730, the pre-filter can form a filtering flow path and a flushing flow path in the filtering mode and the flushing mode, respectively, and can effectively ensure the working performance of the pre-filter in different working modes. In the flushing mode, the pre-filter can regularly clean the impurities attached to the filter assembly 30 through the flushing flow path, thereby ensuring the filtering effect of the filter assembly 30 and improving the service life of the pre-filter.

[0130] Without loss of generality, when the front filter switches from the filtering mode to the flushing mode, that is, when the water outlet 202 is closed and the sewage outlet 102 is opened, the space on the side where the sewage outlet 102 is located is connected to the external environment, and the space on the side where the water inlet 201 is located is connected to the water supply end through the water inlet 201, thereby making the pressure of the space on the side where the water inlet 201 is greater than the pressure of the space on the side where the sewage outlet 102 is located. This pressure difference causes the movable part 730 to move, so that it can move to a position that connects the spaces on both sides of the movable part 730, so that the flushing flow path between the water filter chamber 101 and the sewage outlet 102 is connected.

[0131] That is, in some embodiments of the pre-filter of the present invention, under the action of water pressure, the movable member 730 can be switched between different positions corresponding to the filtering mode and the flushing mode. Of course, in other embodiments, the position switching of the movable member can also be achieved without the help of water pressure, for example, see the structural scheme of the third embodiment below.

[0132] Specifically, optionally, the movable part 730 is transmission-connected to the reversing part 720. Under the action of water pressure, the movable part 730 switches between different positions corresponding to the filtering mode and the flushing mode. Therefore, the reversing part 720 also switches between different positions corresponding to the filtering mode and the flushing mode following the position switching of the movable part 730.

[0133] It can be understood that there are many structural forms for the movable member 730 and the reversing member 720 to achieve transmission connection. For example, see Fig.12 In the first embodiment, optionally, the movable member 730 further includes a connecting portion 732 disposed on the side of the blocking portion 731 away from the sewage outlet 102, and one end of the hollow pipe section 723 of the reversing member 720 close to the sewage outlet 102 is threadedly connected to the connecting portion 732. For example, the hollow pipe section 723 may be provided with a threaded hole, and the connecting portion 732 may be provided with an external thread; or, the hollow pipe section 723 may be provided with an external thread, and the connecting portion 732 may be provided with a threaded hole, which is not specifically limited in the present application.

[0134] See also Figure 1 and Fig.10 In some embodiments, the movable member 730 is provided with a second flow opening 7311. In the flushing mode, the spaces on both sides of the movable member 730 are connected through the second flow opening 7311. In the filtering mode, the second flow opening 7311 is blocked, so that the spaces on both sides of the movable member 730 are isolated. In this way, by controlling the conduction and blocking of the second flow opening 7311, the switching between the flushing mode and the filtering mode can be achieved, and the structure is simple and easy to implement.

[0135] See also Figures 1 to 6In the first embodiment, the movable member 730 includes a blocking portion 731 that can move in the axial direction, the water inlet 201 and the sewage outlet 102 are respectively arranged on both sides of the axial direction of the blocking portion 731, and the second flow port 7311 is at least partially arranged in the blocking portion 731; a first flow port 104 is arranged between the water inlet 201 and the sewage outlet 102, and the blocking portion 731 can conduct the flushing flow path between the first flow port 104 and the second flow port 7311 in the flushing mode, and the blocking portion 731 can block the flushing flow path between the first flow port 104 and the second flow port 7311 in the filtering mode. In this way, the moving 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 moving direction, so that the blocking portion 731 can be driven more reliably.

[0136] See also Figure 3 In the first embodiment, optionally, the penetration direction of the first flow port 104 is parallel to the penetration direction of the sewage outlet 102. It should be noted that parallel means parallel or approximately parallel. In this way, the penetration direction of the first flow port 104 and the movable direction of the movable member 730 are correspondingly set to the same direction, which can facilitate the layout of various structures in the water filter chamber 101 and improve 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.

[0137] 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.

[0138] Without loss of generality, please also refer to Figure 1 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.

[0139] See also Figure 3 and Figure 4In the first embodiment, optionally, a sealing ring surface 711 is provided in the water filter chamber 101 corresponding to the blocking portion 731, the axial direction of the sealing ring surface 711 is parallel to the penetration direction of the first flow port 104, and the outer periphery of the blocking portion 731 is sealed and matched with the sealing ring surface 711, and can move relative to the sealing ring surface 711 along the axial direction. In this way, during the movement of the movable part 730, the outer periphery of the blocking portion 731 always maintains a state of sealing and matching with the sealing ring surface 711. In the filtering mode, it is beneficial to ensure the isolation of the space on both sides of the movable part 730, and avoid 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. In addition, the sealing ring surface 711 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.

[0140] See also Figure 3 and Figure 4 In the first embodiment, further, the pre-filter further includes a reversing bottom shell 710 fixedly mounted on the water filter chamber 101, and a sealing annular surface 711 is provided on the reversing bottom shell 710, that is, the blocking portion 731 is slidably sealed with the inner circumference of the reversing bottom shell 710. In this way, 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 member 730, so as to ensure that the blocking portion 731 switches smoothly between different positions.

[0141] It can be understood that, for the two sides of the reversing bottom shell 710 distributed along the axial direction, in the embodiment without the impeller assembly 40, one side of the reversing bottom shell 710 is fixedly connected to the chassis 511 of the outer frame 50, and the other side is abutted against the filter bottle 10; in the embodiment with the impeller assembly 40, one side of the reversing bottom shell 710 is fixedly connected to the mounting seat 410, and the other side is abutted against the filter bottle 10. In this way, the installation stability of the reversing bottom shell 710 in the filter bottle 10 can be improved, thereby improving the guiding effect on the blocking portion 731 and ensuring the sealing cooperation with the blocking portion 731.

[0142] Of course, in other embodiments, the sealing annular surface 711 may be formed by the filter bottle 10, and the filter assembly 30 and the sealing annular surface 711 on the filter bottle 10 may be slidably sealed together. Alternatively, the first flow port 104 that cooperates with the sealing portion 731 may be formed by the reversing bottom shell 710.

[0143] See also Figure 3 and Figure 4In the first embodiment, further, a sealing ring 1002 is sleeved on the outer periphery of the blocking portion 731, and the outer periphery of the sealing ring 1002 abuts against the sealing ring surface 711. In this way, the blocking portion 731 can seal the reversing bottom shell 710 through the sealing ring 1002 sleeved on the outer periphery and the sealing ring surface 711. The cross section of the sealing ring 1002 can be circular, peanut-shaped, or V-shaped.

[0144] It can be understood that the sealing portion 731 in the first embodiment has a larger diameter and cross-sectional area, and can slide sealingly in the reversing bottom shell 710, so it can respond more sensitively to changes in the water pressure difference on both sides, and displace axially under the action of the water pressure, thereby making the switching of the pre-filter between different working modes (including filtering mode and flushing mode) smoother and more reliable.

[0145] See also Figures 4 to 6 , Fig.14 In the first embodiment, the second flow opening 7311 axially penetrates the opposite sides of the blocking portion 731, and the axial side of the blocking portion 731 can be detachably blocked from the first flow opening 104, and the second flow opening 7311 and the first flow opening 104 are staggered. Specifically, in the flushing mode, the two ends of the second flow opening 7311 are respectively connected to the spaces on the axial sides of the blocking portion 731. 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 part 730. 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.

[0146] 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.

[0147] In some embodiments, further, the movable member 730 switches between different positions corresponding to the filtering mode and the flushing mode, and at least one of the movable member 730 and the reversing member 720 is connected to the elastic member 1003, so that the movable member 730 and the reversing member 720 can be naturally maintained in the position corresponding to the filtering mode.

[0148] For example, see Figure 7In the first embodiment, the elastic member 1003 is connected between the baffle 722 of the reversing member 720 and the water distributor 60. Of course, in other embodiments, the elastic member 1003 may also be connected between the movable member 730 and the housing, for example, see Fig.17 and Fig.18 In the second embodiment, the elastic member 1003 is arranged on one side of the blocking portion 731 close to the sewage outlet 102, and one end of the elastic member 1003 is connected to the blocking portion 731, and the other end of the elastic member 1003 is connected to the sewage discharge assembly 80 or the filter bottle 10.

[0149] It is worth mentioning that in the embodiment of the present invention, optionally, the blocking portion 604 is arranged in an annular shape as a whole, and one end of the elastic member 1003 away from the water passing portion 7224 is sleeved on the blocking portion 604, so that the blocking portion 604 can further serve as a guide for the extension and retraction of the elastic member 1003.

[0150] See also Figures 7 to 10 In the first embodiment, further, the pre-filter also includes a water distributor 60, which is arranged at one end of the filter assembly 30 close to the water inlet 201, and the water distributor 60 forms a water flow space 601 connected to the water filter chamber 101, and the elastic member 1003 is installed between the reversing member 720 and the water distributor 60; the blocking portion 722 includes an annular main body portion 7221 extending along the axial direction of the reversing member 720, and a blocking skirt 7222 arranged on the outer periphery of the annular main body portion 7221, the blocking skirt 7222 covers the water flow space 601 in the flushing mode, and one end of the elastic member 1003 is located on the inner side of the annular main body portion 7221.

[0151] Specifically, the baffle portion 722 includes an annular main body portion 7221 extending along the axial direction of the reversing member 720, and the annular main body portion 7221 is used to be axially connected to the connecting portion 721 and communicate with the inner circumference of the connecting portion 721. The baffle skirt 7222 is arranged around the outer circumference of the annular main body portion 7221. When in the flushing state, the baffle skirt 7222 is directly covered on the water inlet side of the water flow space 601, thereby blocking the water flow space 601, so as to facilitate the control of the on-off of the filtering flow path between the water inlet 201 and the water filter chamber 101. One end of the elastic member 1003 is arranged on the inner side of the annular main body portion 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.

[0152] In other embodiments, the elastic member 1003 may also be disposed on the outer side of the annular main body 7221. In this case, one end of the elastic member 1003 facing the connecting portion 721 may 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. In this case, the elastic member 1003 may not be directly connected to the barrier skirt 7222, and one end of the elastic member 1003 abuts against the side of the barrier skirt 7222 facing the water distributor 60.

[0153] To facilitate the installation of the elastic member 1003 and the water distributor 60, in the embodiment of the present invention, the water distributor 60 is provided with a mounting annular groove 602 communicating with the inner circumference of the filter assembly 30, the water passage space 601 is arranged around the outer circumference of the mounting annular groove 602, the annular main body 7221 is slidably inserted in the mounting annular groove 602, and one end of the elastic member 1003 is inserted into the mounting annular groove 602. Specifically, the bottom of the mounting annular groove 602 is provided with a through hole (the inner circumference of the mounting annular groove 602) communicating with the interior of the filter assembly 30. The reversing member 720 is slidably inserted into the mounting annular groove 602, that is, the annular main body 7221 is slidably inserted into the mounting annular groove 602. On the one hand, the annular main body 7221 can guide the sliding movement of the reversing member 720 relative to the water distributor 60. On the other hand, the annular main body 7221 is inserted into the mounting annular groove 602 to form a closed space together with the mounting annular groove 602, which helps to block the direct connection between the through hole at the bottom of the mounting annular groove 602 and the water inlet 201, so that the interior of the filter assembly 30 can only be connected to the inner periphery of the reversing member 720 through the through hole, and then connected to the water outlet 202, reducing the possibility of the through hole connecting to the water inlet 201. The water-passing space 601 is arranged around the outer periphery of the mounting annular groove 602, so the water-passing space 601 is separated from the mounting annular groove 602, the mounting annular groove 602 is connected to the inner periphery of the filter assembly 30, and the water-passing space 601 is connected to the outer periphery of the filter assembly 30.

[0154] See also Fig.18 In the second embodiment, the movable member 730 is fixedly connected to the reversing member 720, and the elastic member 1003 is arranged on the side of the movable member 730 close to the sewage outlet 102. That is, the elastic member 1003 is located on the side of the movable member 730 close to the sewage outlet 102, so that the elastic member 1003 can be provided with a mounting base through the structure at the bottom of the filter bottle 10, and it is not easy to interfere with other structures. Of course, in other embodiments, the elastic member 1003 can also be arranged on the side of the movable member 730 away from the sewage outlet 102.

[0155] Specifically, the elastic member 1003 is disposed on one side of the blocking portion 731 close to the sewage outlet 102. It can be understood that the elastic member 1003 is hollow, and the second flow port 7311 and the sewage outlet 102 are disposed corresponding to the inner peripheral space of the elastic member 1003. Even if the elastic member 1003 is compressed to a clearance-free fit on the circumference, sewage can be discharged to the sewage outlet 102 through the inner peripheral space of the elastic member 1003. Alternatively, the flow channel between the first flow port 104 and the sewage outlet 102 is disposed bypassing the elastic member 1003.

[0156] See also Fig.18 In the second embodiment, optionally, a mounting protrusion 7312 is convexly provided on one side of the blocking portion 731 close to the sewage outlet 102, and the elastic member 1003 is sleeved on the mounting protrusion 7312. In this way, the elastic member 1003 can be limited by the mounting protrusion 7312, so that the elastic member 1003 is not easily displaced, so that it can be stably installed between the blocking portion 731 and the sewage outlet 102, thereby stably providing a restoring force to the movable member 730. Of course, in other embodiments, a groove can also be provided in the blocking portion 731 to accommodate the end of the elastic member 1003, or the elastic member 1003 can also be embedded in the blocking portion 731.

[0157] In the second embodiment, further, the housing includes a sewage discharge assembly 80, the sewage discharge port 102 is formed in the sewage discharge assembly 80, the sewage discharge assembly 80 includes a sewage discharge valve 820, the elastic member 1003 is located between the movable member 730 and the sewage discharge valve 820, and the two ends of the elastic member 1003 are respectively abutted against the movable member 730 and the sewage discharge assembly 80. In this way, the structure is simple and easy to install.

[0158] See also Figure 3 , Figures 13 to 15 In some embodiments, an impeller assembly 40 is further provided in the water filter chamber 101. The impeller assembly 40 includes a mounting seat 410 and an impeller body 440 rotatably mounted on the mounting seat 410. The impeller body 440 is coaxially connected to the outer frame 50 and is fixed in the circumferential direction. The mounting seat 410 is formed with a first water inlet 402 and a drain outlet 404 that are connected to each other. The first water inlet 402 is connected to the first discharge port 503, and the drain outlet 404 is connected to the sewage outlet 102.

[0159] Among them, the water flow flowing into the mounting seat 410 through the first water inlet 402 can make the blades drive the impeller shaft 441 to rotate. In the flushing stage of the pre-filter, that is, when the drain valve 820 is opened, the water flows into the first water inlet 402 of the impeller assembly 40, and the impeller body 440 rotates under the impact of the water flow. This rotational motion can produce 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, suspend them in the water, and discharge them from the filter bottle 10 through the drain valve 820 and the drain port 102 with the water flow, thereby avoiding the re-deposition of impurities on the filter medium and ensuring the thoroughness of the flushing process. Furthermore, the impeller assembly 40 can effectively prevent the clogging of the filter medium by enhancing the flushing effect, keep the water flow unblocked, and maintain the filtration efficiency of the pre-filter, which is very important for maintaining stable water pressure and clean water quality in a home or commercial system.

[0160] 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.

[0161] See also Figure 3 and Fig.13 In some embodiments, optionally, the mounting seat 410 is further provided with a second water inlet 403, the first water inlet 402 is provided on one axial side of the mounting seat 410, and the second water inlet 403 is provided on the peripheral side of the mounting seat 410; the chassis 511 is further provided with a second discharge port 504 penetrating along the axial direction, and a water retaining structure 1004 is formed on the opposite side of the exoskeleton 50 and the mounting seat 410, the water retaining structure 1004 is arranged around the first discharge port 503, and the second discharge port 504 is located on the periphery of the water retaining structure 1004; the first water inlet 402 is connected to the first discharge port 503, and the second water inlet 403 is connected to the second discharge port 504. Specifically, the water retaining structure 1004 can block the flushing flow path of the second discharge port 504 and the first discharge port 503, so that the water flowing out of the first discharge port 503 can only flow to the first water inlet 402, and the water flowing out of the second discharge port 504 can only flow to the second water inlet 403.

[0162] In this way, by adding a second water inlet 403 and a second discharge port 504, water on the inner side of the outer skeleton 50 can flow directly into the second water inlet 403 through the second discharge port 504, thereby increasing the water flow path and flow rate entering the impeller chamber 401, which can provide more sufficient power for the rotation of the impeller body 440 and enable the water flow to form a more complex flow pattern in the impeller chamber 401.

[0163] Of course, in other embodiments, the second water inlet 403 and the water retaining structure may not be provided.

[0164] Please also read Fig.16 In the first embodiment, optionally, the outer frame 50 is provided with a water retaining ring 515, and the mounting seat 410 is provided with a water retaining ring 424. The water retaining ring 515 and the water retaining ring 424 cooperate to form a water retaining structure 1004. The siphon flow channel 501 and the first water inlet 402 are connected at the inner periphery of the water retaining structure 1004, and the filter chamber 101 is connected to the second water inlet 403 at the outer periphery of the water retaining structure 1004 through the second discharge port 504. Further, the mounting seat 410 is provided with second water inlets 403 on both opposite sides. When the water in the filter bottle 10 other than the siphon flow channel 501 is discharged, it 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 chamber 401 through the first water inlet 402.

[0165] In the first embodiment, further, the exoskeleton 50 is connected to the impeller body 440 by transmission, and the impeller body 440 itself rotates under the impact of the water flow and links the exoskeleton 50, so that the impeller body 440 can rotate in the same direction as the exoskeleton 50 during the flushing stage, that is, it can provide a rotational driving force to the exoskeleton 50. On this basis, the rotational movement of the exoskeleton 50 helps to enhance the siphon effect of the siphon hole 531 and the siphon channel 501 thereon, thereby enhancing the cleaning effect in the flushing mode.

[0166] There are many types of structural forms of transmission connection between the outer frame 50 and the impeller body 440, for example, see Figures 13 to 16 In the first embodiment, the impeller body 440 includes an impeller shaft 441, and a clamping portion is provided on the side of the outer frame 50 facing the mounting seat 410, and the end of the impeller shaft 441 passing through the mounting seat 410 is clamped with the clamping portion. In this way, the impeller shaft 441 is connected to the clamping portion by clamping, so as to realize the clamping of the impeller body 440 and the outer frame 50, which not only facilitates the connection operation of the impeller body 440 and the outer frame 50, but also ensures the connection stability of the impeller body 440 and the outer frame 50, so that the impeller body 440 can pull the outer frame 50 to rotate stably, thereby ensuring the reliability of flushing and cleaning the filter assembly 30.

[0167] Without loss of generality, after the impeller shaft 441 and the clamping part are clamped, they are relatively fixed in the circumferential direction, so that the impeller body 440 and the outer frame 50 can rotate synchronously on the same axis. Of course, after the impeller shaft 441 and the clamping part are clamped, the two can also be fixed in the axial direction to avoid the failure of the clamping relationship between the outer frame 50 and the impeller body 440 during water flushing. Among them, the impeller shaft 441 can be formed in parts and then assembled to form the impeller body 440, or it can be formed integrally with the impeller body 440.

[0168] See also Fig.13 and Fig.16 In the first embodiment, optionally, the clamping portion is configured as a plurality of first protrusions 514 distributed in a circumferential manner, and a plurality of second protrusions 443 are provided at one end of the impeller shaft 441 close to the outer frame 50, and the plurality of second protrusions 443 are distributed along the circumference of the impeller shaft 441, and a first protrusion 514 is clamped between two adjacent second protrusions 443. It can be understood that the plurality of first protrusions 514 or the plurality of second protrusions 443 are each arranged in a ring shape, and the groove between two adjacent second protrusions 443 is adapted to a first protrusion 514, and the groove between two adjacent first protrusions 514 is adapted to a second protrusion 443, so that the clamping stability of the first protrusion 514 and the second protrusion 443 is guaranteed. At the same time, during the rotation of the impeller shaft 441, the force between the first protrusion 514 and the second protrusion 443 is stable, and the impeller body 440 and the outer frame 50 can be timely and efficiently transmitted to ensure the cleaning efficiency. In addition, multiple first protrusions 514 and multiple second protrusions 443 are snap-connected. When the connection between some of the first protrusions 514 and the second protrusions 443 fails, the connection between the other first protrusions 514 and the second protrusions 443 can still ensure the snap-connection stability between the impeller body 440 and the outer frame 50.

[0169] In this embodiment, further, the second protrusion 443 is exposed on the outside of the mounting seat 410. In this way, when the impeller body 440 is connected to the exoskeleton 50, the first protrusion 514 and the second protrusion 443 are connected on the outside of the mounting seat 410, providing the technician with an operational field of view for the connection, avoiding the impeller chamber 401 from blocking the connection between the impeller body 440 and the exoskeleton 50, and improving the operational convenience of the connection between the exoskeleton 50 and the impeller body 440.

[0170] Of course, in other embodiments, the structure of the transmission connection between the outer skeleton 50 and the impeller body 440 may also be in other forms, and this application does not make any specific limitation on this.

[0171] See also Figure 3 , Fig.13 and Fig.15Furthermore, the mounting seat 410 also has an impeller cavity 401, and a plurality of second water inlets 403 with the same circumferential opening are arranged at intervals on the circumferential side of the mounting seat 410, and the first water inlet 402, the second water inlet 403 and the drain port 404 are all connected to the impeller cavity 401; the impeller body 440 includes an impeller shaft 441 and a plurality of blades 442 obliquely arranged on the impeller shaft 441, and the water flow from the first water inlet 402 and the second water inlet 403 can make the blades 442 drive the impeller shaft 441 to rotate. In this way, the water flow path and flow rate entering the impeller cavity 401 are increased through the first water inlet 402 and the second water inlet 403, and the provision of multiple water inlets (including the first water inlet 402 and the second water inlet 403) can make the water flow form a more complex flow pattern in the impeller cavity 401, providing sufficient power for the rotation of the impeller body 440.

[0172] It can be understood that at least one of the first water inlet 402, the second water inlet 403 and the drain port 404 can be used as the first flow port 104. In this embodiment, the drain port 404 is provided on a side of the impeller chamber 401 close to the sewage outlet 102 and serves as the first flow port 104. Of course, in other embodiments, the first water inlet 402 or the second water inlet 403 can also be used as the first flow port 104.

[0173] See also Fig.16 In the first embodiment, optionally, the exoskeleton 50 includes a chassis 511 disposed on the side of the filter assembly 30 close to the sewage outlet 102, and the chassis 511 is also provided with a second discharge port 504 connecting the water filter chamber 101 and the outside of the exoskeleton 50, and the second discharge port 504 is connected to the second water inlet 403. That is, part of the water inside the exoskeleton 50 can flow directly from the second discharge port 504 into the second water inlet 403, and part of the water flows to the first discharge port 503 through the siphon channel 501 and then flows into the first water inlet 402. In this way, the addition of the second discharge port 504 provides an additional discharge channel for the accumulated water inside the exoskeleton 50, which helps to speed up the water flow and improve the drainage efficiency. During the use of the filter, especially under high flow or high pressure conditions, this design can significantly reduce the risk of water accumulation inside the exoskeleton 50 and ensure the smooth operation of the filter. By timely draining the accumulated water inside the outer frame 50, the retention time of the water between the filter assembly 30 and the outer frame 50 can be reduced, which helps to improve the overall filtering effect of the pre-filter.

[0174] According to the water accumulation inside the exoskeleton 50 and the drainage requirements, a plurality of second discharge ports 504 can be provided on the chassis 511. These second discharge ports 504 can be evenly distributed or arranged in a targeted manner according to the water accumulation area to maximize the drainage efficiency. Specifically, a plurality of second discharge ports 504 are provided, and a second discharge port 504 is provided between two adjacent siphon channels 501 and close to the outside of the chassis 511 relative to the first discharge port 503. The second discharge port 504 is arranged at a position symmetrical to the first discharge port 503 to maintain the balance and beauty of the overall structure. This arrangement also helps to disperse the drainage pressure and improve the drainage efficiency.

[0175] See also Figure 1 In some embodiments, the filter assembly 30 includes a filter module 300, a water passage cavity 340 is formed inside the filter module 300, a first water passage 330 connected to the water cavity 340 is provided in the axial direction of the filter module 300, a second water passage 350 connected to the water cavity 340 is provided in the circumferential direction of the filter module 300, the filter module 300 includes a filter element 320 arranged at the second water passage 350, and the siphon hole 531 is arranged corresponding to the filter element 320.

[0176] Specifically, in the filtering mode, the water in the water filter chamber 101 flows into the water chamber 340 from the second water port 350, and is filtered by the filter element 320 on the second water port 350 to remove impurities, and the water in the water chamber 340 then flows from the first water port 330 to the water outlet 202; in the flushing mode, the water in the water filter chamber 101 flows into the water chamber 340 from the first water port 330, and then flows from the water chamber 340 through the second water port 350 to the outside of the filter module 300. In this process, the water flowing through the second water port 350 will flush the filter element 320, so that the impurities on the filter element 320 fall off and mix into the water in the water filter chamber 101, and finally discharged through the sewage outlet 102. Among them, impurities located on the inner side of the outer frame 50 will be sucked into the siphon hole 531 and discharged to the first discharge port 503 through the siphon channel 501. By setting the siphon hole 531 corresponding to the filter element 320, the siphon effect and efficiency can be improved.

[0177] Optionally, the filter element 320 is at least partially tilted. The form and structure of the filter element 320 are not limited, and it may be a stainless steel filter or a PP cotton filter. In this way, by tilting the filter element 320 at least partially, the filter area of ​​the filter element 320 is increased relative to the cylindrical structure of the filter element 320 extending axially. Under the same axial height, the filter area of ​​the filter element 320 can be increased. Due to the increase in the filter area of ​​the filter element 320, it can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filter area of ​​the filter element 320 is large enough, even if a local area of ​​the filter element 320 is clogged, the remaining area of ​​the filter element 320 can continue to withstand a larger flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0178] Optionally, the filter element 320 is arranged in an annular shape, and the axis extends along the first direction. The filter element 320 has an inner ring edge and an outer ring edge, and the outer ring edge is located on the axial side of the inner ring edge, and the siphon hole 531 is arranged side by side with the outer ring edge in the first direction. It can be understood that the outer ring edge is closer to the inner side of the outer skeleton 50 than the inner ring edge, and the filter element 320 is in a structural form that extends obliquely from the inner ring edge toward the outer ring edge, so that impurities falling off the filter element 320 can flow along the outer surface of the filter element 320 to the outer ring edge and be sucked in by the siphon hole 531 adjacent to the outer ring edge. In this way, the siphon effect and its efficiency can be improved. Of course, in other embodiments, the siphon hole 531 can also be arranged side by side with the inner ring edge in the first direction, or the siphon hole 531 can be between the inner ring edge and the outer ring edge in the first direction.

[0179] See also Figure 1 Optionally, the filter module 300 is provided with multiple axially, and two adjacent filter modules 300 are connected through the first water outlet 330. The exoskeleton 50 is sleeved on the outside of the filter component 30. The siphon flow channel 501 includes a side wall flow channel 501a extending along the axial direction and located on the outside of the filter component 30. The side wall flow channel 501a is provided with multiple siphon holes 531 at intervals along the axial direction, and a siphon hole 531 corresponds to at least one filter element 320.

[0180] In this embodiment, the filter assembly 30 includes multiple filter modules 300. Since the filter area on each filter module 300 is constant, by setting up multiple filter modules 300, the total filter area of ​​the filter assembly 30 can be increased, thereby improving the filter efficiency; moreover, when the filter element 320 of a single filter module 300 is tilted, setting up multiple filter modules 300 can further utilize the space and form a larger total filter area.

[0181] Optionally, the same filter module 300 has two opposite filter elements 320 in the first direction, and the two filter elements 320 are arranged in a tapered shape in the direction away from each other, and the siphon hole 531 is arranged corresponding to at least one of the two filter elements 320. In this way, the two filter elements 320 of the same filter module 300 are arranged in a tapered shape in the direction away from each other, so that a bell-shaped space with an opening facing outward is formed between the two adjacent filter elements 320 of the two adjacent filter modules 300, and the bell-shaped space is conducive to the impurities falling off the filter element 320 to flow to the siphon hole 531. Optionally in this embodiment, the two filter elements 320 on the same filter module 300 are each provided with a siphon hole 531, so that the impurities falling off each filter element 320 can be targetedly sucked away by the corresponding siphon hole 531, thereby improving the siphon effect and efficiency. Of course, in other embodiments, the two filter elements 320 on the same filter module 300 can also be provided with only one siphon hole 531.

[0182] In this embodiment, one siphon hole 531 is optionally provided corresponding to one filter element 320. By distributing multiple siphon holes 531 axially on the side wall flow channel 501a and corresponding one to one with the filter elements 320, in the flushing mode, the particles falling off each filter element 320 can be guided and discharged by the corresponding siphon hole 531, which can further improve the flushing effect. Of course, in other embodiments, one siphon hole 531 can also be provided corresponding to multiple filter elements 320, for example, one siphon hole 531 is provided between two adjacent filter elements 320 to be responsible for the siphon effect of the two filter elements 320.

[0183] Optionally, the siphon hole 531 is arranged side by side with the filter element 320 in the first direction. In this way, the siphon hole 531 can be arranged as close to the filter element 320 as possible, so as to promptly absorb the impurities falling off the filter element 320 during the flushing stage. Of course, in other embodiments, the siphon hole 531 can also be arranged in a staggered manner with the filter element 320 in the first direction.

[0184] It should be noted that the multiple indicated in this solution can be understood as greater than or equal to two.

[0185] In order to further improve the flushing efficiency and effect, optionally, at least two side wall flow channels 501a are provided, and at least two side wall flow channels 501a are spaced apart on opposite sides of the filter assembly 30. In this way, the multiple siphon holes 531 on the multiple side wall flow channels 501a work simultaneously and play a more efficient siphoning role on the filter element 320. In this embodiment, optionally, three side wall flow channels 501a are provided. Of course, in other embodiments, two, four or more side wall flow channels 501a may also be provided, or only one side wall flow channel 501a may be provided.

[0186] Optionally, the siphon flow channel 501 further includes a bottom flow channel 501b connected to the side wall flow channel 501a and extending radially, and the bottom flow channel 501b is provided with a first discharge port 503 and is located on a side of the filter assembly 30 close to the sewage outlet 102. In this way, the siphon effect can be improved by connecting the side wall flow channel 501a and the first discharge port 503 through the bottom flow channel 501b. Of course, in other embodiments, the bottom flow channel 501b may not be provided, and the first discharge port 503 may be directly formed at the lower end of the side wall flow channel 501a.

[0187] Specifically, in the present embodiment, two siphon channels 501 are designed on the outer skeleton 50, and the two siphon channels 501 are distributed at an angle of 180°. The siphon channel 501 includes a side wall channel 501a extending axially and a bottom channel 501b connected to the side wall channel 501a and extending radially. Each side wall channel 501a is provided with a plurality of siphon holes 531 distributed axially, and the siphon holes 531 are elliptical in shape. The number and layout of the siphon holes 531 are related to the number and structure of the modules of the filter assembly 30, and can be arranged flexibly. The water inside the siphon channel 501 flows to the bottom channel 501b and flows out from the first discharge port 503. The first discharge port 503 is arranged at an oblique angle, so that the water flow can be tilted into the bottom impeller assembly 40, thereby improving the rotation efficiency of the impeller.

[0188] See also Fig.18 The siphon flow channel 501 is in an "L" shape, the side wall flow channel 501a is the vertical part of the "L" shape, and the bottom flow channel 501b is the horizontal part of the "L" shape. The side wall flow channel 501a is arranged corresponding to the side frame 512, which means that the side wall flow channel 501a is arranged on the side frame 512 part, and does not limit the formation method of the side wall flow channel 501a.

[0189] See also Figure 1 , Figure 3 and Fig.12 In the first embodiment, the impeller body 440 includes a hollow impeller shaft, and the connecting portion 732 of the movable member 730 passes through the impeller shaft from the reversing bottom shell 710 and can rotate relative to the impeller body 440. In this way, the impeller shaft is configured as a hollow cylinder for the connecting portion 732 of the movable member 730 to pass through, which simplifies the structure and improves the compactness of the pre-filter. Of course, in other embodiments, the impeller shaft can also be designed as a solid shaft.

[0190] See also Fig.12In the first embodiment, further, the filter assembly 30 further includes an end cap 301, which is disposed at the first water passage 330 near the sewage outlet 102, one end of the movable member 730 passes through the end cap 301 and is connected to the hollow pipe section 723, and the hollow pipe section 723 is sealed with the end cap 301, so that the first water passage 330 near the sewage outlet 102 is closed. In this way, in the filtering mode, all the water on the outside of the filter assembly 30 can flow through the filter element 320 radially and flow into the inside of the filter assembly 30, and then flow axially to the water outlet 202, thereby ensuring the filtering effect; in the flushing mode, all the water on the inside of the filter assembly 30 can flow through the filter element 320 radially and flow out to the outside of the filter assembly 30, thereby improving the flushing effect.

[0191] Specifically, optionally, a columnar structure is protruding from the side of the end cover 301 away from the sewage outlet 102, and the end face of the columnar structure is provided with a hole structure, and the end face of the hollow pipe section 723 is provided with a threaded hole for threaded connection of the movable part 730, and the peripheral side surface of the hollow pipe section 723 slides against the hole wall surface of the hole structure to achieve a sealed fit between the hollow pipe section 723 and the end cover 301.

[0192] See also Fig. 20 and Fig.21 In the third embodiment, the pre-filter further includes a driving member 750, which is drivingly connected to the reversing member 720 and partially exposed outside the shell. Among them, the part of the driving member 750 exposed on the outside of the pre-filter is for the user to act on. The user acts on the driving member 750 to drive the reversing member 720 to switch between two positions corresponding to the filtering mode and the flushing mode. It can be understood that in this embodiment, through the additional driving member 750, the blocking part 731 mainly relies on the driving action of the driving member 750 to achieve position switching, rather than relying on the action of water pressure. Of course, in this embodiment, optionally, the blocking part 731 can also be set to be able to automatically displace due to water pressure, and at the same time be driven by the driving member 750 to support the user to manually switch modes.

[0193] See also Figure 24 to Figure 27 In the third embodiment, further, the driving member 750 includes a driving screw 751, one of the housing and the reversing member 720 is rotatably connected to the driving screw 751 and is axially fixed, and the other of the valve head 20 and the reversing member 720 is threadedly connected to the driving screw 751 through a screw connection structure.

[0194] When the reversing member 720 is screwed to the driving screw 751 through the screw connection structure, the driving screw 751 can rotate relative to the valve head 20, but is axially fixedly arranged relative to the valve head 20. In this way, when the driving screw 751 is rotated by the user, the driving screw 751 does not move axially relative to the valve head 20, but only rotates. Due to the threaded cooperation between the screw connection structure and the driving screw 751, the reversing member 720 will be driven to move axially relative to the valve head 20, thereby realizing the switching of the reversing member 720 between different axial positions.

[0195] When the valve head 20 is screwed to the driving screw 751 through a screw structure, the driving screw 751 can rotate relative to the reversing member 720, but is axially fixed relative to the reversing member 720. In this way, when the driving screw 751 is rotated by the user, the driving screw 751 can move axially relative to the valve head 20. Since the driving screw 751 and the reversing member 720 are relatively fixed in the axial direction, the reversing member 720 will be driven to move axially together. Moreover, since the driving screw 751 and the reversing member 720 are rotatably arranged, the reversing member 720 will not be driven by the driving screw 751 to rotate, which can reduce the movement of the reversing member 720 relative to the water barrier ring 203 and the filter assembly 30, thereby reducing friction.

[0196] In this embodiment, the driving member 750 drives the switching member 720 to move axially through a threaded connection. Of course, in other embodiments, the axial drive of the switching member 720 can also be achieved through a worm gear mechanism, or the driving member 750 drives the switching member 720 to rotate in an appropriate manner.

[0197] In one embodiment, see Fig.24 and Fig.25 The screw connection structure is configured as a mounting bracket 740 fixedly mounted in the reversing member 720, and the driving screw 751 is screwed to the mounting bracket 740, and is rotatably connected to the valve head 20 and fixed in the axial direction. Specifically, a screw hole is provided at the center of the mounting bracket 740, and the driving screw 751 is screwed to the screw hole to achieve screw connection between the reversing member 720 and the driving screw 751. The mounting bracket 740 is provided with a plurality of water-passing holes at intervals around the circumference of the screw hole, so that the spaces on both sides of the axial direction between the mountings on the inner circumference of the reversing member 720 can be connected, without affecting the flow of water in the reversing member 720. Furthermore, the mounting bracket 740 can, of course, in other embodiments, an internal thread can be set on the inner circumference of the switching member 720, the driving screw 751 can be fixedly sleeved on the outside of the mounting bracket 740, and an external thread can be set on the outer circumference of the mounting bracket 740. Through the screw connection between the mounting bracket 740 and the switching member 720, the screw connection drive between the driving screw 751 and the switching member 720 is realized.

[0198] In one embodiment, the mounting bracket 740 is detachably connected to the switching member 720. In this way, when one of the mounting bracket 740 and the switching member 720 is structurally damaged, the two can be disassembled and the damaged part can be replaced, which is conducive to saving the maintenance cost of the pre-filter. Of course, in other embodiments, the mounting bracket 740 can also be integrally formed with the switching member 720, or the two can be separately formed and fixedly connected by welding or bonding.

[0199] In one embodiment, the mounting bracket 740 is snap-connected to the reversing member 720. Of course, in other embodiments, the mounting bracket 740 and the reversing member 720 may also be connected by plugging, snapping or screw locking.

[0200] See also Fig.25 In the third embodiment, specifically and optionally, the mounting bracket 740 includes an inner ring portion 741 and an outer ring portion 742 connected to each other, the driving screw 751 is screwed to the inner ring portion 741, and the outer ring portion 742 is snap-connected to the switching member 720. That is, the inner and outer peripheries of the mounting bracket 740 are both provided with ring portions, the inner periphery of the inner ring portion 741 is formed with screw holes for the driving screw 751 to be screwed, and the outer ring portion 742 can fit the inner periphery of the switching member 720 to ensure that the mounting bracket 740 can be stably snap-connected to the switching member 720. Of course, in other embodiments, the outer periphery of the mounting bracket 740 may not be provided with a ring portion.

[0201] In the third embodiment, optionally, a plurality of connecting arms 743 extending in the axial direction are connected to one axial side of the outer ring portion 742, the plurality of connecting arms 743 are distributed at intervals in the circumferential direction, the connecting arms 743 are provided with a clamping protrusion 744, the commutator 720 is provided with a buckle groove correspondingly, the clamping protrusion 744 is buckled with the buckle groove, the inner ring portion 741 is arranged opposite to the connecting arms 743, and is connected to the plurality of connecting arms 743 one by one through a plurality of connecting ribs 745 distributed in the circumferential direction. That is, the inner ring portion 741 and the outer ring portion 742 are arranged in an axially staggered manner, the outer ring portion 742 is buckled with the commutator 720 through the connecting arms 743, and the inner ring portion 741 is arranged opposite to the connecting portion 732, which is conducive to shortening the length of the force transmission path between the commutator 720 and the driving screw 751, and is convenient for driving the commutator 720. The inner ring portion 741 and the outer ring portion 742 are connected one-to-one by a plurality of connecting ribs 745 and a plurality of connecting arms 743, which is beneficial to enhancing the structural strength of the mounting bracket 740 and increasing the number of force transmission paths between the switching member 720 and the driving screw 751, thereby avoiding stress concentration between the two. The mounting bracket 740 is not easily damaged, which is beneficial to ensuring the connection stability between the switching member 720 and the driving screw 751.

[0202] In the third embodiment, optionally, the buckle groove is formed in the baffle portion 722 , and the outer ring portion 742 is exposed at a port of the reversing member 720 , specifically, the outer ring portion 742 is exposed at a port on a side of the connecting portion 721 away from the baffle portion 722 . Specifically, the connecting portion 721 and the blocking portion 722 are distributed axially from the water isolation ring 203 to the water distributor 60, and the connecting portion 721 has a hole-like structure distributed circumferentially. The mounting bracket 740 is inserted from one side of the connecting portion 721 to the inner circumference of the switching member 720, wherein the end face of the outer ring portion 742 is preferably flush with the end face of the switching member 720, and the connecting arm 743 extends into the inner circumference of the switching member 720 relative to the blocking portion 722. A locking protrusion 744 is provided at the end of the connecting arm 743, which is engaged with the buckle groove of the blocking portion 722 through the locking protrusion 744. In this way, the connection stability between the mounting bracket 740 and the switching member 720 can be guaranteed, and the mounting bracket 740 has little obstruction to the water flow at the connecting portion 721. Furthermore, the inner ring portion 741 is located relative to the blocking portion 722, and the inner ring portion 741 will not block the water flow at the connecting portion 721.

[0203] Please also read Fig.26 and Fig. 27 In the third embodiment, further, the driving member 750 further includes a driving knob 752, which is fixed to the end of the driving screw 751 and is located outside the valve head 20. In this way, the user can drive the driving screw 751 to rotate relative to the valve head 20 by rotating the driving knob 752, and the outer diameter of the driving knob 752 can be set to be larger than the outer diameter of the driving screw 751. Further, anti-slip grooves can be set on the outer periphery of the driving knob 752, or a flat position can be set on the end surface of the driving knob 752 to facilitate user operation. Of course, in other embodiments, the end of the driving screw 751 can also be exposed to the valve head 20, and a flat position is set, so that the user can act on the driving screw 751 through a wrench, thereby driving the driving screw 751 to rotate.

[0204] In one embodiment, the driving knob 752 is rotatably connected to the valve head 20, and is limitedly matched with the valve head 20 in the axial direction, so that the two are relatively fixed in the axial direction. In this way, through the limited matching of the driving knob 752 and the valve head 20, the driving screw 751 can be relatively fixed with the valve head 20 in the axial direction to ensure the motion transmission between the driving screw 751 and the reversing member 720. Specifically, it can be that a groove is provided on the outer side of the valve head 20, and the driving knob 752 is at least partially accommodated in the groove. One of the inner wall of the groove and the outer periphery of the driving knob 752 is provided with an annular groove, and the other is provided with a convex portion slidably connected with the annular groove. The convex portion can be annular, or can be provided at a single point, or can be provided in multiple portions and distributed at intervals along the circumferential direction. In this way, through the matching of the annular groove and the convex portion, the driving knob 752 and the driving screw 751 can be relatively fixed with the valve head 20 in the axial direction, and can rotate relative to the valve head 20. Of course, in other embodiments, the drive screw 751 may be limitedly matched with the valve head 20 in the axial direction.

[0205] It is worth mentioning that in the embodiment in which the movable part 730 is transmission-connected to the reversing part 720, the reversing part 720 is driven to move axially by the driving part 750, which can not only switch the flow path between the water inlet 201 and the water filter chamber 101, but also drive the movable part 730 to move to open or close the sewage channel 140. That is, the blocking portion 731 of the movable part 730 realizes a function similar to that of a valve core at the sewage channel 140. Therefore, a valve body structure may not be additionally provided at the sewage channel 140. When the pre-filter performs mode switching, it is only necessary to perform corresponding operations on the valve body at the water outlet 202 and perform corresponding operations on the reversing part 720.

[0206] See also Fig. 22 and Fig.23 In the third embodiment, further, the movable member 730 includes a blocking portion 731, and the pre-filter is further provided with a drain channel 140 connected to the drain port 102. The blocking portion 731 blocks the drain channel 140 in the filtering mode and opens the drain channel 140 in the flushing mode. That is, the movable member 730 moves axially to open or close the drain channel 140, that is, the blocking portion 731 realizes a function similar to a valve core at the drain channel 140, and therefore, a valve body structure may not be additionally provided at the drain channel 140. In this way, the structure is simple and easy to implement.

[0207] See also Fig. 22 and Fig.23In the third embodiment, further, the sewage channel 140 has a first channel 141 and a second channel 142 coaxially connected, and the first channel 141 is located on a side close to the water filter chamber 101; the movable part 730 also includes an avoidance portion 733, and the avoidance portion 733 is connected to a side of the blocking portion 731 close to the water filter chamber 101; in the filtering mode, the blocking portion 731 blocks the first channel 141, and in the flushing mode, the blocking portion 731 is in the second channel 142 and has a clearance fit with the second channel 142, and the avoidance portion 733 passes through the first channel 141 and has a clearance fit with the first channel 141.

[0208] It can be understood that the inner diameter of the second channel 142 is larger than the outer diameter of the sealing portion 731, the inner diameter of the first channel 141 is larger than the outer diameter of the avoidance portion 733, the inner diameter of the second channel 142 is larger than the inner diameter of the first channel 141, the outer diameter of the sealing portion 731 is larger than the outer diameter of the avoidance portion 733, the avoidance portion 733 and the first channel 141 and the second channel 142 can all be loosely matched, when the movable part 730 moves, the avoidance portion 733 will not interfere with the sewage channel 140, and, in the flushing mode, the avoidance portion 733 and the sealing portion 731 will not block the sewage channel 140, so that the sewage channel 140 is opened, and the filter chamber can be connected to the sewage pipe via the gap between the second channel 142 and the avoidance portion 733 and the gap between the first channel 141 and the sealing portion 731 in sequence.

[0209] In the third embodiment, further, the outer periphery of the blocking portion 731 is provided with a sealing ring 1002. In the filtering mode, the blocking portion 731 is located in the first channel 141, and the outer periphery of the sealing ring 1002 abuts against the inner peripheral wall of the first channel 141. At this time, the outer diameter of the blocking portion 731 should be equal to or slightly smaller than the inner diameter of the first channel 141, so that the blocking portion 731 can be sealed by the sealing ring 1002 and the inner peripheral wall of the first channel 141, thereby achieving the blocking of the first channel 141. Among them, the cross section of the sealing ring 1002 can be circular or peanut-shaped or V-shaped. Of course, in other embodiments, in the filtering mode, the blocking portion 731 can also abut against the step surface at the connection between the first channel 141 and the second channel 142, and the end side of the first channel 141 is blocked by the end side of the blocking portion 731, thereby achieving the sealing of the first channel 141. At this time, the outer diameter of the blocking portion 731 should be greater than the inner diameter of the first channel 141.

[0210] The present invention also proposes a water use system, which includes the aforementioned pre-filter. The specific structure of the pre-filter refers to the above-mentioned embodiment. Since the water use system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0211] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The housing has a water filter cavity, and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity, wherein the water inlet is connected to the water supply end, and the water outlet is connected to the water use end; A filter assembly is arranged in the water filter chamber; An outer frame is arranged in the water filter cavity and is provided with a siphon flow channel, a siphon hole and a first discharge port respectively connected to the siphon flow channel, and the first discharge port is connected to the sewage outlet; as well as 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 arranged in the water filter chamber 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 blocked by the blocking portion.

2. The pre-filter according to claim 1, characterized in that: The shell 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, and the water outlet is connected to the inner peripheral side of the water isolating ring; the pre-filter also includes a water distributor, the water distributor is provided at one end of the filter assembly close to the water isolating ring, and the water distributor forms a water flow space connected to the water filter cavity; In the filtering mode, on the adjacent side of the water distributor and the water isolation ring, the water inlet is connected to the water flow space, and the water inlet is isolated from the inner peripheral side of the reversing member; In the flushing mode, on the adjacent sides of the water distributor and the water blocking ring, the water inlet is connected to the inner circumference of the reversing member through the connecting portion, and the blocking portion separates the water inlet from the water flow space.

3. The pre-filter according to claim 2, characterized in that: The water isolation ring and the water distributor together 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, in the filtering mode, the water passing structure is separated from the connecting portion, and in the flushing mode, the water passing structure is connected to the connecting portion.

4. The pre-filter according to claim 3, characterized in that: The water isolating ring and the water distributor are integrally formed, and the water passing structure is a through hole provided at the connection between the water isolating ring and the water distributor; or, The water isolating ring and the water distributor are formed separately, and the water isolating ring and the water distributor are abutted and assembled to form a through hole; or, The water isolating ring and the water distributor are formed separately, and the water passing structure is the interval between the water isolating ring and the water distributor.

5. The pre-filter according to claim 2, characterized in that: The water isolating ring and the water distributor are arranged at intervals, and the connecting portion and the blocking portion are distributed along the axial direction; In the filtering mode, the baffle is at least located between the water isolation ring and the water distributor, so that the water inlet is connected to the water flow space; In the flushing mode, the connecting portion is at least partially located between the water isolating ring and the water distributor, so that the connecting portion is connected to the water inlet, and the blocking portion blocks the water flow space.

6. The pre-filter according to claim 2, characterized in that: The baffle portion includes an annular main body extending along the axial direction of the reversing member, and a baffle skirt arranged around the outer periphery of the annular main body, the water distributor is provided with an installation annular groove communicating with the inner periphery of the filter assembly, the water flow space is arranged around the outer periphery of the installation annular groove, and the annular main body is slidably inserted into the installation annular groove; In the flushing mode, the baffle skirt covers the water flow space.

7. The pre-filter according to claim 6, characterized in that: The inner circumference of the annular main body is also provided with a water passing portion, the peripheral wall of the water passing portion is provided with a second communicating hole, and the bottom of the mounting ring groove is provided with a blocking portion; In the filtering mode, the water passing portion and the blocking portion are provided with a gap so that the second communicating hole is connected to the inner periphery of the filtering assembly; In the flushing mode, the blocking portion blocks the communication between the second communication hole and the inner periphery of the filter assembly.

8. The pre-filter according to claim 1, characterized in that: The switching member includes a switching section and a hollow pipe section connected in sequence along the axial direction, the switching section includes the connecting portion and the blocking portion, the hollow pipe section is inserted in the filter assembly, and the peripheral wall of the hollow pipe section is provided with a first connecting hole, the flushing flow path between the first connecting hole and the water inlet is connected through the connecting portion and blocked by the blocking portion.

9. The pre-filter according to claim 8, characterized in that: The filter assembly includes a plurality of filter elements distributed along the axial direction, a plurality of first connecting holes are provided, and are configured to form a jet of water toward the filter elements. In the flushing mode, the first connecting holes are arranged axially corresponding to the filter elements.

10. The pre-filter according to claim 1, characterized in that: The pre-filter also includes a movable part, which is movably arranged in the water filter chamber so that the pre-filter can switch between a filtering mode and a flushing mode. The water inlet, the water outlet and the first discharge port are arranged on one side of the movable part, and the sewage outlet is arranged on the other side of the movable part. The spaces on the opposite sides of the movable part are isolated in the filtering mode and connected in the flushing mode.

11. The pre-filter according to claim 10, characterized in that: The movable member is transmission-connected to the reversing member.

12. The pre-filter according to claim 11, characterized in that: Under the action of water pressure, the movable part switches between different positions corresponding to the filtering mode and the flushing mode, and at least one of the movable part and the reversing part is connected to the elastic part, so that the movable part and the reversing part can be naturally maintained at the positions corresponding to the filtering mode.

13. The pre-filter according to claim 12, characterized in that: The pre-filter further comprises a water distributor, which is arranged at one end of the filter assembly close to the water inlet, and the water distributor forms a water flow space communicating with the water filter cavity, and the elastic member is installed between the reversing member and the water distributor; The barrier portion includes an annular main body extending along the axial direction of the reversing member, and a barrier skirt arranged around the outer circumference of the annular main body, the barrier skirt covers the water flow space in the flushing mode, and one end of the elastic member is located on the inner side of the annular main body.

14. The pre-filter according to claim 13, characterized in that: The water distributor is provided with a mounting ring groove connected to the inner circumference of the filter assembly, the water flow space is arranged on the outer circumference of the mounting ring groove, the reversing member is slidably inserted in the mounting ring groove, and one end of the elastic member is inserted into the mounting ring groove.

15. The pre-filter according to claim 12, characterized in that: The movable part is fixedly connected to the reversing part, and the elastic part is arranged on a side of the movable part close to the sewage outlet.

16. The pre-filter according to claim 15, characterized in that: The movable part includes a blocking part, the water inlet and the sewage outlet are respectively arranged on two axial sides of the blocking part, a first flow port is arranged between the water inlet and the sewage outlet, and the blocking part is provided with a second flow port, the second flow port and the first flow port are staggered, and the axial side surface of the blocking part can be detachably blocked from the first flow port.

17. The pre-filter according to claim 16, characterized in that: A mounting protrusion is convexly provided on one side of the blocking portion close to the sewage outlet, and the elastic member is sleeved on the mounting protrusion.

18. The pre-filter according to claim 16, characterized in that: The shell includes a sewage discharge component, the sewage discharge port is formed in the sewage discharge component, the sewage discharge component includes a sewage discharge valve, the elastic member is located between the movable member and the sewage discharge valve, and the two ends of the elastic member are respectively abutted against the movable member and the sewage discharge component.

19. The pre-filter according to claim 11, characterized in that: The pre-filter further comprises a driving member, which is drivingly connected to the reversing member and exposed outside the housing.

20. The pre-filter according to claim 19, characterized in that The driving member includes a driving screw, one of the housing and the switching member is rotatably connected to the driving screw and is axially fixed, and the other of the housing and the switching member is threadedly connected to the driving screw via a screw connection structure.

21. The pre-filter according to claim 20, characterized in that: The screw connection structure is configured as a mounting bracket fixedly arranged in the switching member, the driving screw is screwed to the mounting bracket, and is rotatably connected to the housing and fixed in the axial direction.

22. The pre-filter according to claim 20, characterized in that: The driving member further comprises a driving knob, which is fixed to the driving screw and located outside the housing.

23. The pre-filter according to claim 10, characterized in that: The movable part includes a blocking portion, and the pre-filter is further provided with a sewage discharge channel connected to the sewage discharge port. The blocking portion blocks the sewage discharge channel in the filtering mode and opens the sewage discharge channel in the flushing mode.

24. The pre-filter according to claim 23, characterized in that The sewage discharge channel comprises a first channel and a second channel which are coaxially connected, wherein the first channel is located at a side close to the water filter chamber; the movable member further comprises an avoidance portion, wherein the avoidance portion is connected to a side of the blocking portion close to the water filter chamber; In the filtering mode, the blocking portion blocks the first channel, and in the flushing mode, the blocking portion is in the second channel and is gapped with the second channel, and the avoidance portion passes through the first channel and is gapped with the first channel.

25. The pre-filter according to claim 1, characterized in that: The filter assembly includes a filter module, a water passage cavity is formed inside the filter module, a first water passage port connected to the water passage cavity is provided in the axial direction of the filter module, a second water passage port connected to the water passage cavity is provided in the circumferential direction of the filter module, the filter module includes a filter element provided at the second water passage port, and the siphon hole is provided corresponding to the filter element.

26. The pre-filter according to claim 25, characterized in that The filter modules are provided with multiple ones along the axial direction, and two adjacent filter modules are connected through the first water outlet. The outer skeleton is sleeved on the outside of the filter component. The siphon flow channel includes a side wall flow channel extending along the axial direction and located on the outside of the filter component. The side wall flow channel is provided with multiple siphon holes at intervals along the axial direction, and one siphon hole corresponds to at least one filter element.

27. The pre-filter according to claim 26, characterized in that The siphon flow channel also includes a bottom flow channel connected to the side wall flow channel and extending radially. The bottom flow channel is provided with the first discharge port and is located on a side of the filter assembly close to the sewage discharge port.

28. The pre-filter according to claim 1, 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 water inlet and a drain, the water inlet is connected to the first discharge port, and the drain is connected to the sewage outlet.

29. The pre-filter according to claim 28, characterized in that The water inlet includes a first water inlet and 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 the circumferential side of the mounting seat; the exoskeleton is also provided with a second discharge port, and a water retaining structure is formed on the 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 on the outer periphery of the water retaining structure; the first water inlet is connected to the first discharge port, and the second water inlet is connected to the second discharge port.

30. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 29.

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