Pre-filter and water system

Abstract

The utility model discloses a pre-filter and a water consumption system, and relates to the technical field of filters. Wherein the pre-filter comprises a valve head, a filter bottle, a filter assembly, a reversing piece and a movable piece, the reversing piece and the movable piece are in transmission connection and are movably arranged, so that the pre-filter can be switched between a filtering mode and a flushing mode, the reversing piece can switch flow paths, the movable piece can switch on and off of spaces on the two sides, and the valve head is connected with the valve head. At least one of the reversing piece and the movable piece is connected with an elastic piece, and under the action of the elastic piece, the reversing piece and the movable piece can be naturally maintained at the position corresponding to the filtering mode. The technical scheme provided by the utility model has the technical effects that the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

[0001] The utility model 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, their demands for daily water use are also increasing. Due to long-term disrepair and aging of tap water pipes, the water contains a large amount of large particles harmful to the human body, such as mud, rust, and bloodworms, which seriously affect the health of residents. Therefore, a pre-filter is provided, which is equipped with a filter assembly and other components to filter out large particles before the tap water is used. However, while the pre-filter is filtering the water, impurities will adhere to the water filter cavity, especially the surface of the filter assembly. Over time, this will clog the filter assembly and reduce the filtering effect of the filter assembly. Utility Model Content

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

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

[0005] A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet connected to the water filter cavity, and the filter bottle is provided with a sewage outlet connected to the water filter cavity on a side away from the valve head;

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

[0007] A reversing member and a movable member in transmission connection, wherein the reversing member is movably inserted into the filter assembly to enable the pre-filter to switch between a filtering mode and a flushing mode;

[0008] The reversing member is hollow, and 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 water inlet, the water outlet and the filter assembly are arranged on one side of the movable member, and the sewage outlet is arranged on the other side of the movable member.

[0009] In the filtering mode, the flushing flow path between the water inlet and the reversing member is cut off by the blocking portion, and the spaces on opposite sides of the movable member are separated;

[0010] In the flushing mode, the flushing flow path between the water inlet and the reversing member is connected through the blocking portion, and the spaces on opposite sides of the movable member are connected;

[0011] At least one of the reversing member and the movable member is connected to an elastic member. Under the action of the elastic member, the reversing member and the movable member can naturally maintain positions corresponding to the filtering mode.

[0012] In one embodiment, the filter assembly is fixedly installed in the water filter cavity, and a first elastic member is provided between the reversing member and the filter assembly.

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

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

[0015] The reversing member further includes a hollow pipe section, the connecting portion, the blocking portion and the hollow pipe section are sequentially distributed along the axial direction, the connecting portion is plugged into the water separator, the blocking portion is plugged into the water distributor, and the hollow pipe section extends into the filter module;

[0016] On adjacent sides of the water distributor and the water isolation ring, the water flow structure is isolated from the connecting portion in the filtering mode and is connected to the connecting portion in the flushing mode.

[0017] In one embodiment, a first elastic member is provided between the reversing member and the water distributor.

[0018] In one embodiment, a water passage cavity is formed inside the filter module, a first water passage port communicating with the water passage cavity is provided in the axial direction of the filter module, a second water passage port communicating with the water passage cavity is provided in the circumferential direction of the filter module, and a filter element is provided in the second water passage port;

[0019] The water distributor has a first water flow space corresponding to the first water flow port and a second water flow space corresponding to the second water flow port. The second water flow space is provided with guide blades inclined relative to the circumferential direction. The water distributor and the water isolation ring are arranged opposite to and spaced apart in the axial direction. In the filtering mode, the axial sides of the baffle are respectively connected to the water distributor and the water isolation ring, and are respectively connected to the first water flow space and the inner circumference of the water isolation ring, and are spaced apart from the second water flow space. In the flushing mode, the connecting part is at least partially located between the water distributor and the water isolation ring, and the baffle covers the second water flow space.

[0020] In one embodiment, the barrier portion includes an annular main portion extending axially along the reversing member, and a barrier skirt arranged on the outer periphery of the annular main portion, the connecting portion and the annular main portion are distributed axially, and the annular main portion and the water distributor are movably plugged in and matched.

[0021] In one embodiment, a first mounting ring groove is provided on the outer circumference of the first water flow space, a second mounting ring groove is provided on the inner circumference of the annular main body, and the elastic member includes a first elastic member, one end of the first elastic member is installed in the first mounting ring groove, and the other end is installed in the second mounting ring groove.

[0022] In one embodiment, a second elastic member is connected to a side of the movable member close to the sewage outlet.

[0023] In one embodiment, the pre-filter also includes a sewage discharge assembly, the sewage outlet is formed in the sewage discharge assembly, the sewage discharge assembly includes a sewage discharge valve, the second elastic member is located between the movable member and the sewage discharge valve, and the two ends of the second elastic member are respectively abutted against the movable member and the sewage discharge assembly.

[0024] In one embodiment, the sewage discharge assembly includes a connecting member, the connecting member is installed at the sewage discharge port, the sewage discharge valve is connected to the connecting member, and the second elastic member abuts against the connecting member.

[0025] In one embodiment, a shielding portion is fixedly provided in the water filter chamber, the movable part includes a sealing portion and a connecting portion provided on the side of the sealing portion away from the sewage outlet, the water inlet and the sewage outlet are provided on both axial sides of the sealing portion, the movable part is provided with a flow port, the water outlet side of the flow port penetrates to the side of the sealing portion close to the sewage outlet, the water inlet side of the flow port extends axially to the connecting portion, and radially penetrates the radial side surface of the connecting portion, and in the filtering mode, the shielding portion blocks the water inlet side of the flow port.

[0026] In one embodiment, the connecting portion is axially movable so that the shielding portion can be detachably blocked on the water inlet side of the flow opening.

[0027] In one embodiment, the shielding portion is annular, and the water inlet side of the flow port is accommodated in the shielding portion in the filtering mode and is at least partially exposed to the outside in the flushing mode.

[0028] In one embodiment, a mounting protrusion is provided on one side of the blocking portion close to the sewage outlet, and a second elastic member is sleeved on the mounting protrusion.

[0029] In one embodiment, the mounting protrusion and the connecting portion are coaxially arranged, and the water outlet side of the flow port passes through the mounting protrusion.

[0030] In one embodiment, a sealing annular surface is provided in the water filter cavity corresponding to the blocking portion, and the outer periphery of the blocking portion is sealedly fitted with the sealing annular surface and can move axially relative to the sealing annular surface.

[0031] In one embodiment, the pre-filter also includes a reversing bottom shell, which is fixedly installed in the water filter chamber. The reversing bottom shell is hollow, and the inner circumferential surface of the reversing bottom shell is the sealing ring surface. The sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

[0032] In one embodiment, the pre-filter also includes an exoskeleton, which is sleeved on the outside of the filter assembly. The exoskeleton is connected to a reversing bottom shell on the side close to the sewage outlet. The sealing part is located in the reversing bottom shell, the shielding part is provided on the exoskeleton, and the connecting part extends into the exoskeleton.

[0033] In one embodiment, the filter assembly includes a plurality of filter modules connected in sequence, 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 second water flow port is provided with a filter element, the filter element is arranged in a ring shape, and 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.

[0034] In one embodiment, the filter module includes two support frames distributed along the axial direction, the water flow cavity is formed between the two support frames, each support frame is provided with the second water flow outlet, and the inner ring edge and the outer ring edge of the two adjacent filter elements are distributed in opposite directions.

[0035] In one embodiment, the support skeleton includes an oblique support portion, and the two ends of the oblique support portion are respectively connected to a first ring portion and a second ring portion. The two oblique support portions of the same filter module are connected through the second ring portion. The inner periphery of the first ring portion is provided with the first water outlet, and the second water outlet is provided on the oblique support portion.

[0036] In one embodiment, each of the support frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

[0037] The utility model also provides a water use system, comprising the aforementioned pre-filter.

[0038] In the technical solution of the present utility model, the pre-filter is of a backwash type. The reversing member and the movable member are linked to switch between different positions, effectively ensuring the operating performance of the pre-filter in different operating modes. Due to the transmission between the movable member and the reversing member, the reversing member switches the flow path between the water inlet and the filter assembly, and the movable member also changes the connection relationship between the sewage outlet and the water inlet, 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. In the flushing mode, the pre-filter can regularly clean impurities attached to the filter assembly through the flushing flow path, thereby ensuring the filtering effect of the filter assembly and extending the service life of the pre-filter. At the same time, under the action of the elastic member, when the pre-filter is in the filtering mode, the reversing member and the movable member can stably maintain their current positions, providing a stable filtering working environment for the pre-filter. When the pre-filter is in the flushing mode, when the external driving force is removed, the reversing member and the movable member can spontaneously return to the position corresponding to the filtering mode, facilitating the switching of the pre-filter back to the filtering mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0040] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present utility model;

[0041] Figure 2 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0042] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0043] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0044] Figure 5 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in flushing mode;

[0045] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0046] Figure 7 for Figure 5A partial enlarged view of point D in the middle;

[0047] Figure 8 This is a structural diagram of an embodiment of the exoskeleton of the pre-filter provided by the present invention;

[0048] Figure 9 This is a schematic diagram of the assembly structure of the movable parts, reversing parts and filter components of the pre-filter provided by the utility model;

[0049] Figure 10 for Figure 9 A schematic structural diagram of an embodiment of a switching member in FIG.

[0050] Figure 11 for Figure 9 A schematic diagram of the local structure of the moving parts in FIG.

[0051] Figure 12 for Figure 11 A schematic structural diagram of the local structure of the moving parts in another perspective;

[0052] Figure 13 for Figure 9 A schematic diagram of the connection structure of two filter modules of an embodiment of a filter assembly;

[0053] Figure 14 for Figure 9 A schematic diagram of the connection structure of two filter modules of another embodiment of the filter assembly;

[0054] Figure 15 for Figure 9 Schematic diagram of the exploded structure of an embodiment of the filtering module in FIG.

[0055] Figure 16 for Figure 9 A structural diagram of an embodiment of a filter component in FIG.

[0056] Description of Figure Numbers:

[0057] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet;

[0058] 20, valve head; 201, water inlet; 202, water outlet; 203, water isolation ring;

[0059] 30. Filter assembly; 300. Filter module; 301. First connection structure; 302. Second connection structure;

[0060] 310, supporting frame; 311, oblique supporting portion; 312, first ring portion; 313, second ring portion;

[0061] 320, filter element;

[0062] 330, first water outlet; 340, water passage cavity; 350, second water outlet;

[0063] 50. Exoskeleton; 503. Discharge port;

[0064] 511, chassis; 512, side frame; 550, shielding part;

[0065] 60. Water distributor; 610. First water flow space; 620. Second water flow space; 621. Guide vane; 630. First mounting ring groove;

[0066] 710, reversing bottom shell; 711, sealing ring surface;

[0067] 720, reversing member; 721, connecting portion; 722, blocking portion; 7221, reversing main body; 7222, blocking skirt; 723, hollow pipe section; 724, second mounting ring groove;

[0068] 730, movable part; 731, blocking part; 7311, flow outlet; 7312, mounting protrusion; 732, connecting part; 734, sealing part; 7301, water inlet side; 7302, water outlet side;

[0069] 80. Sewage discharge assembly; 810. Connector; 820. Sewage discharge valve;

[0070] 1001, fastener; 1003, first elastic member; 1004, second elastic member.

[0071] 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

[0072] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0073] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0074] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0075] Water systems, such as whole-house water purification systems, typically feature a pre-filter to remove large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system and is a physical filtration device used to protect back-end water safety.

[0076] The utility model proposes a pre-filter, which has a filtering mode and a flushing mode. In the filtering mode, the pre-filter can filter large particulate matter before the water end. In the flushing mode, the pre-filter can clean the filter components inside it 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.

[0077] See also Figures 1 to 7 In one embodiment of the present invention, the pre-filter includes a valve head 20 and a filter bottle 10, the filter bottle 10 is formed with a water filter chamber 101, the valve head 20 is provided with a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, and the filter bottle 10 is provided with a sewage outlet 102 on the side away from the valve head 20.

[0078] The water inlet 201 is connected to the water supply end of the water supply system, and the water outlet 202 is connected to the water consumption end of the water supply system, thereby filtering the raw water flowing from the water supply end to the water consumption end. It should be noted that the water supply end can be a tap, water tower, or well water, and the water consumption end can be a faucet, shower, or drinking water outlet, which is not specifically limited in this application.

[0079] The connection between the valve head 20 and the filter bottle 10 can be a threaded connection. For example, the valve head 20 may be provided with an externally threaded tube, and the mouth of the filter bottle 10 may be provided with an internal thread for threading the externally threaded tube. To reduce the production difficulty of the prefilter and the inspection requirements for the assembly results, as well as to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001. The fastener 1001 may be a bolt, wherein the bolt and the through hole threadably engage to lock the filter bottle 10 and the valve head 20. The fastener 1001 may also be a bolt and nut assembly, wherein the bolt passes through the through hole and is locked with the nut. The fastener 1001 may also be a pin and a pin shaft assembly, wherein the pin passes through the through hole and the pin shaft passes through the pin, thereby locking the filter bottle 10 and the valve head 20.

[0080] The valve head 20 includes a metal outer shell 21 and a plastic lining 22, both of which are connected. The water inlet 201 and the water outlet 202 are formed in the plastic lining 22. The metal outer shell 21 of the valve head 20 and the filter bottle 10 are connected by fasteners 1001. In this way, the water flowing through the pre-filter directly contacts the plastic lining 22 rather than the metal outer shell 21. This can prevent the water from being contaminated by metal elements precipitated from the metal outer shell 21, and can also make the pre-filter have good aesthetics and shell strength. In other embodiments, the valve head 20 can also be directly configured as a metal part.

[0081] The materials of the metal shell portion 21 and the plastic lining portion 22 are not specifically limited in this application. For example, the material of the metal shell portion 21 can be a copper alloy, such as brass, and the material of the plastic lining portion 22 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0082] The pre-filter also includes a filter assembly 30 disposed within the water filter chamber 101. After raw water (e.g., tap water or well water) flows from an external water source into the water inlet 201, 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. This provides better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to impurity blockage. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter mesh or a PP cotton filter mesh to filter impurities.

[0083] The pre-filter is usually a "T"-shaped structure. The upper "horizontal" position corresponds to the valve head 20, and the left and right ends are the water inlet 201 and the water outlet 202 respectively. The lower "vertical" main body is the filter bottle 10, and the sewage outlet 102 is located on the lower side of the filter bottle 10.

[0084] In one embodiment, please refer to Figures 13 to 16The filter assembly 30 includes a filter module 300, and a water flow cavity 340 is formed inside the filter module 300. A first water flow port 330 communicating with the water flow cavity 340 is provided in the axial direction of the filter module 300, and a second water flow port 350 communicating with the water flow cavity 340 is provided in the circumferential direction of the filter module 300. The filter module 300 includes a filter element 320 provided at the second water flow port 350, and the filter element 320 is at least partially inclined. It can be understood that in the filtering mode, the raw water will enter the water flow chamber 340 through the second water flow outlet 350 on the peripheral side of the filter module 300, so that the impurities in the raw water can be filtered by the filter element 320, and finally the clean water flows from the first water flow outlet 330 on the axial side of the filter module 300 to the water outlet 202. Since the filter element 320 is at least partially inclined, the filtering area of ​​the filter element 320 can be increased at the same axial height, which means that at the same flow rate, the filter element 320 of this solution can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filtering area of ​​the filter element 320 of this solution is large enough, even if a local area of ​​the filter element 320 is blocked, the remaining area of ​​the filter element 320 can continue to withstand a larger flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0085] It can be understood that in the filtration flow path of the pre-filter, the second water inlet 350, the water passage cavity 340, and the first water inlet 330 are sequentially arranged along the upstream and downstream sides. That is, when the pre-filter is in filtration mode, water entering from the water inlet 201 will flow through the second water inlet 350, the water passage cavity 340, and the first water inlet 330 in sequence to the water outlet 202. In other words, the water will flow from the outside of the filter module 300 to the inside of the filter module 300. However, when the pre-filter is in flushing mode, since the pre-filter is a backwash type, the flow direction of the water in the filter module 300 will change, flowing from the inside of the filter module 300 to the outside of the filter module 300. In other words, the water will flow from the water passage cavity 340 through the second water inlet 350 to the water passage cavity 101 on the outer peripheral side of the filter module.

[0086] Without loss of generality, the filter element 320 is annular and has an inner and outer ring edges, with the outer ring edge located axially to one side of the inner ring edge. That is, the inner and outer ring edges are not at the same height in the axial direction, so that the filter element 320 maintains an inclined shape in the circumferential direction. This can further increase the filtration area of ​​the filter element 320, further improve the flow load that the filter element 320 can withstand, and improve the filtration efficiency.

[0087] In one embodiment, if Figure 16As shown, the filter assembly 30 includes a plurality of filter modules 300. The provision of multiple filter modules 300 enhances the modularity of the filter assembly 30. The number of filter modules 300 can be flexibly adjusted according to the model of the pre-filter (for example, but not limited to, the size of the filter bottle 10), thereby achieving the effect of adjusting the size of the filter assembly 30, thereby solving the problem of sharing the filter assembly 30 of pre-filters of different models. Since the filtration area on each filter module 300 is fixed, by adjusting the number of filter modules 300, the total filtration area of ​​the filter assembly 30 can also be adjusted, thereby enabling the appropriate filtration area to be set, thereby achieving the effect of improving the filtration effect.

[0088] Furthermore, the outer side surface of the filter element 320 is configured as a conical surface. The conical surface design facilitates uniform distribution and smooth flow of the fluid, reduces eddy currents and turbulence within the filter module 300, and reduces energy loss. Specifically, the generatrix of the conical surface can be a straight line, or the generatrix of the conical surface can be a concave arc that is concave toward the inside of the water chamber 340, or the generatrix of the conical surface can be a convex arc that is convex toward the outside of the water chamber 340. In other embodiments, the outer side surface of the filter element 320 can also be a pyramidal surface with a polygonal cross-section, thereby increasing the filtration area of ​​the filter element 320.

[0089] In one embodiment, if Figure 16 As shown, the filter assembly 30 further includes a water distributor 60 , which is axially connected to the filter module 300 . Specifically, when multiple filter modules 300 are provided, the water distributor 60 is connected to a filter module 300 that is closer to the valve head 20 .

[0090] In one embodiment, see Figure 13 and Figure 14 A first connecting structure 301 and a second connecting structure 302 are respectively provided on both axial sides of the filter module 300. The first connecting structure 301 of one filter module 300 is used to detachably connect with the second connecting structure 302 of the other filter module 300, thereby fixing the two filter modules 300. At least one of the first connecting structure 301 and the second connecting structure 302 can be detachably connected to the water distributor 60. In other words, the structure for detachably connecting the two filter modules 300 is also used for detachably connecting with the water distributor 60. In this way, the modularity of the filter assembly 30 can be improved, and the assembly of the various structures of the filter assembly 30 can be facilitated.

[0091] Among them, it can be that one of the first connecting structure 301 and the second connecting structure 302 is set as a convexity and the other is set as a groove, and the water distributor 60 is correspondingly provided with a convexity or a groove. Of course, it can also be that one of the first connecting structure 301 and the second connecting structure 302 is set as a hook and the other is set as a hook groove, and the water distributor 60 is correspondingly provided with a hook or a hook groove.

[0092] Specifically, the filter module 300 may be provided with a latching protrusion on the side close to the water distributor 60 and a latching groove on the side away from the water distributor 60, and the water distributor 60 may be provided with a latching groove on the side close to the filter module 300. In this way, the water distributor 60 and the filter module 300 as well as the two adjacent filter modules 300 can be detachably connected through the cooperation of the latching protrusion and the latching groove, and the same applies to the cooperation of the hook groove and the latching hook.

[0093] In one embodiment, please refer to Figures 13 to 16 The filter module 300 includes two axially distributed support frames 310, with the water passage chamber 340 formed between the two support frames 310. Each support frame 310 is provided with a filter element 320, and the inner and outer annular edges of two adjacent filter elements 320 are arranged in opposite directions. It can be understood that, given a constant radial space within the water filter chamber 101, compared to a filter module 300 that maintains a tapered shape in one direction, a filter element 320 in the same filter module 300 that tapers in opposite directions can achieve a larger filtration area. In this way, this embodiment fully utilizes the space within the water filter chamber 101, creating a larger filtration area around the filter module 300, ensuring that the filter assembly 30 can withstand a greater flow load and improving filtration efficiency. At the same time, a sufficiently large water passage chamber 340 can be formed within the two support frames 310 to facilitate water flow. Of course, in other embodiments, a filter module 300 may also include only one support frame 310 , and the first water outlet 330 , the second water outlet 350 and the water passage cavity 340 are formed on the same support frame 310 .

[0094] In one embodiment, the support frame 310 includes an oblique support portion 311, with a first ring portion 312 and a second ring portion 313 connected to each end of the oblique support portion 311. The two oblique support portions 311 of the same filter module 300 are connected by the second ring portion 313. The first water outlet 330 is provided on the inner periphery of the first ring portion 312, and the second water outlet 350 is provided on the oblique support portion 311. This ensures the structural strength of the support frame 310 and the connection strength between the two support frames 310, thereby maintaining the filtration capacity of the filter assembly 30. Of course, in other embodiments, the support frame 310 can also be configured as other structural forms.

[0095] Specifically, the inclined support portion 311 includes a plurality of ribs spaced apart along the circumferential direction to form a plurality of second water outlets 350 spaced apart along the circumferential direction. The filter element 320 is stacked on the inclined support portion 311. In this way, the inclined support portion 311 can provide sufficient support to the filter element 320, and the total flow area of ​​the second water outlet 350 is large, so that the filter module 300 has sufficient flow capacity.

[0096] Without loss of generality, the outer diameter of the second ring portion 313 is larger than the outer diameter of the first ring portion 312. Thus, each filter element 320 alternately tapers in the upper and lower directions, making fuller use of the space within the water filter cavity 101 to provide a larger filtration area, thereby further improving the filtration efficiency of the filter assembly 30. Of course, in other embodiments, the outer diameter of the first ring portion 312 may be larger than the outer diameter of the second ring portion 313, or there may be no fixed size relationship between the diameters of the first ring portion 312 and the second ring portion 313.

[0097] In one embodiment, each support frame 310 is provided with a second ring portion 313, and the two second ring portions 313 of the same filter module 300 are detachably connected. It will be appreciated that a detachable connection allows for easy separation of components without damaging the connected components or adjacent components. This feature allows for quick and efficient maintenance or replacement of the support frame 310 of the filter module 300, reducing maintenance effort and costs. The ease of detachable connection significantly saves time when maintaining or replacing the support frame 310 of the filter module 300. Furthermore, the detachable connection allows for quick replacement of faulty support frames 310, thereby reducing water system outage time and improving maintenance efficiency. Furthermore, compared to non-detachable connections, detachable connections reduce the likelihood of entire components being scrapped due to inability to disassemble, thus reducing resource waste. Furthermore, the detachable connection allows for regular or irregular inspection and maintenance of the filter assembly 300 to ensure its stability and safety, helping to promptly identify and address potential safety hazards.

[0098] Furthermore, in some possible connection methods, the two second ring portions 313 are snap-connected. It can be understood that when the second ring portion 313 is made of plastic or metal, the snap-connecting structure can be directly molded on the second ring portion 313, and no additional locking accessories, such as screws, nuts, etc., are required during assembly, thereby reducing manufacturing costs and assembly costs. Moreover, since the snap-connecting structure is flexible in design, it can be customized according to the actual needs of the second ring portion 313, reducing material waste and improving material utilization. Secondly, snap-connection can achieve rapid assembly and disassembly without the need for complex tools and equipment. This greatly improves production efficiency and assembly efficiency, and also facilitates the maintenance and replacement of the filter module 300. Specifically, the snap-connecting structure can be a combination of a hook and a hook groove, or a combination of a protrusion and a groove. Of course, in other embodiments, the two second ring portions 313 may be threadedly connected. Through the tight engagement of the threads, the connection between the two second ring portions 313 has high tensile and compressive strength, which can meet the use requirements under various working conditions. After assembly, the connection portion 732 is not easy to loosen and can maintain a stable connection state, thereby ensuring the normal operation of the filter module 300.

[0099] Optionally, in the same filter module 300, the end faces of the two second ring portions 313 abut against each other; it can be understood that in the same filter module 300, the two support skeletons 310 are connected through the two second ring portions 313, and the water flow cavity 340 is formed between the two support skeletons 310. By abutting the end faces of the two second ring portions 313, the two support skeletons 310 can be connected while the water flow cavity 340 is sealed, which is beneficial to saving processing steps and improving production efficiency.

[0100] In one embodiment, the first ring portions 312 of two adjacent filter modules 300 are detachably connected. The specific method of detachably connecting the two first ring portions 312 can refer to the connection method of the two second ring portions 313, and the connection method between the water distributor 60 and the filter module 300 can also refer to the connection method between the two second ring portions 313. In this way, modular assembly between different filter modules 300 can be facilitated. Furthermore, the end faces of the first ring portions 312 of the two adjacent filter modules 300 are abutted against each other, so that while the connection of the two adjacent filter modules 300 is achieved, the first water outlets 330 of the two adjacent filter modules 300 can be connected, thereby saving processing steps and improving production efficiency.

[0101] In one embodiment, if Figure 16As shown, the water distributor 60 has a first water flow space 610 corresponding to the first water flow port 330 and a second water flow space 620 corresponding to the second water flow port 350. The second water flow space 620 is provided with guide vanes 621. The filtration flow path between the water inlet 201 and the outer periphery of the filter module 300 is connected through the second water flow space 620. Water flows through the second water flow space 620 into the water filter chamber 101, forming a vortex flow that disturbs the water flow and prevents impurity deposition.

[0102] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The pre-filter also includes a reversing member 720, which is hollow. The inner circumference of the reversing member 720 is connected to the water outlet 202 and the water filter chamber 101. The reversing member 720 includes a connecting portion 721 and a blocking portion 722. The reversing member 720 can be movably inserted into the filter assembly 30, so that the pre-filter can switch between a filtering mode and a flushing mode. The flushing flow path between the water inlet 201 and the reversing member 720 is connected through the connecting portion 721 and is cut off by the blocking portion 722.

[0103] In the technical solution of the present invention, the pre-filter is a backwash filter. In flushing mode and filtering mode, the direction of water flowing through the filter assembly 30 is opposite, and this water flow direction is switched by the diverter 720. This solution can change the connection relationship between different structures through the movement of the diverter 720, thereby changing the flow direction of raw water entering the water inlet 201 and the flow path of water within the water filter chamber 101, enabling the pre-filter to switch between filtering mode and flushing mode, and realizing self-flushing of the internal filter assembly 30 of the pre-filter, thereby eliminating the need for manual disassembly and cleaning, facilitating cleaning of the pre-filter, and thereby increasing the service life of the pre-filter. The connecting portion 721 and the blocking portion 722 are integrally formed in the diverter 720, thereby facilitating assembly of the diverter 720, ensuring the overall strength of the diverter 720, and preventing the presence of an installation gap between the connecting portion 721 and the blocking portion 722, which could cause unexpected water leakage into the diverter 720 and cause water flow disturbances.

[0104] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6The valve head 20 is provided with a water-isolating ring 210 between the water inlet 201 and the water outlet 202. The water inlet 201 is connected to the outer peripheral side of the water-isolating ring 210, and the water outlet 202 is connected to the inner peripheral side of the water-isolating ring 210. The reversing member 720 is axially movable and inserted into the water-isolating ring 210 and the filter assembly 30. It can be understood that the water-isolating ring 210 and the filter assembly 30 are arranged opposite to each other along the axial direction, and one end of the reversing member 720 is plugged into and matched with the water-isolating ring 210, wherein the reversing member 720 can be sleeved on the outside of the water-isolating ring 210, or the water-isolating ring 210 can be sleeved on the outside of the reversing member 720, and the other end of the reversing member 720 extends into the water-flowing cavity 340 through the first water-flowing space 610. In this way, the reversing member 720 can stably switch between different positions corresponding to the filtering mode and the flushing mode under the constraints of the water isolation ring 210 and the filter assembly 30. Of course, in other embodiments, the reversing member 720 or other components may be formed with a corresponding water isolation structure, which cooperates with the valve head 20 to perform the function of the water isolation ring 210 in this embodiment.

[0105] Please also refer to Figure 2 and Figure 3 When the reversing member 720 is driven to the position corresponding to the filtering mode, the position of the blocking portion 722 can avoid the filtering flow path between the water inlet 201 and the second water flow space 620, and cut off the flushing flow path between the water inlet 201 and the inner circumference of the reversing member 720, so that the filtering flow path from the water inlet 201 to the water filter chamber 101 through the second water flow space 620 is connected. At this time, since the sewage outlet 102 is closed and the water outlet 202 is opened, after the raw water enters from the water inlet 201, it can directly pass through the second water flow space 620 to the filter assembly 30 for filtration, and flow from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water, and the filtered water flows to the water outlet 202 through the inner circumference of the reversing member 720.

[0106] Please also refer to Figure 4 and Figure 5 When the reversing member 720 is driven to the position corresponding to the flushing mode, the position of the blocking portion 722 can isolate the water inlet 201 and the second water flow space 620, so as to isolate the filtration flow path between the water inlet 201 and the water filter chamber 101. The position of the connecting portion 721 can allow the water inlet 201 to communicate with 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 open 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.

[0107] Among them, the connecting portion 721 and the blocking portion 722 are integrally formed on the reversing member 720, which not only facilitates the assembly of the reversing member 720, but also ensures the overall strength of the reversing member 720, and avoids the installation gap between the connecting portion 721 and the blocking portion 722, which may cause accidental water leakage into the reversing member 720 and cause water flow turbulence.

[0108] In one embodiment, the water-isolating ring 210 and the water distributor 60 are jointly constructed to form a water-passing structure, and the water-passing structure is connected to the water inlet 201; on the adjacent side of the water distributor 60 and the water-isolating ring 210, the water-passing structure is separated from the connecting portion 721 in the filtering mode, and is connected to the connecting portion 721 in the flushing mode.

[0109] In this embodiment, the water flow structure is formed by the water isolation ring 210 and the water distributor 60. The switching member 720 switches between different positions, which can change the relative positions of the blocking portion 722 and the connecting portion 721 with the water flow structure, thereby controlling the connection and disconnection between the water flow structure and the corresponding space, thereby connecting or blocking the corresponding flow path. Of course, in other embodiments, the water flow structure can also be formed only on the water isolation ring 210.

[0110] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The water separator 210 and the water distributor 60 are spaced apart, the water-passing structure is the space between the water separator 210 and the water distributor 60, and the connecting portion 721 and the blocking portion 722 are distributed along the axial direction;

[0111] In the filtering mode, the blocking portion 722 is at least located between the water isolation ring 210 and the water distributor 60 , so that the water inlet 201 is connected to the second water flow space 620 ;

[0112] In the flushing mode, the communication portion 721 is at least partially located between the water isolation ring 210 and the water distributor 60 , so that the communication portion 721 is connected to the water inlet 201 , and the blocking portion 722 blocks the second water flow space 620 .

[0113] In this embodiment, the water-passing structure is configured as the gap between the water-isolating ring 210 and the water distributor 60. The connecting portion 721 and the blocking portion 722 are axially distributed, and the reversing member 720 is axially movable relative to the filter bottle 10. In different modes, the reversing member 720 axially moves to dispose the connecting portion 721 and the blocking portion 722 relative to the gap between the water-isolating ring 210 and the water distributor 60.

[0114] When the barrier portion 722 is arranged relative to the interval between the water-isolating ring 210 and the water distributor 60, the barrier portion 722 is at least located between the water-isolating ring 210 and the water distributor 60, and the interval at this location is divided into two parts by the barrier portion 722, one part is on the outer peripheral side of the reversing member 720, and the other part is on the outer peripheral side of the reversing member 720. The two parts are not directly connected here, but form the following filtration flow path: the raw water flows from the water inlet 201 through the second water flow space 620 to the water filter chamber 101, and in the water filter chamber 101, flows from the outer peripheral side of the filter 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.

[0115] When the connecting portion 721 is arranged relative to the interval between the water-isolating ring 210 and the water distributor 60, the connecting portion 721 is at least partially located between the water-isolating ring 210 and the water distributor 60. In this way, at this interval, the outer peripheral side of the reversing member 720 can be connected to the inner peripheral side of the reversing member 720 through the connecting portion 721. Since the blocking portion 722 blocks the second water flow space 620, the raw water flows from the water inlet 201 through the connecting portion 721 to the inner periphery of the reversing member 720, and then at the position corresponding to the filter assembly 30, it flows from the inner periphery of the reversing member 720 through the filter assembly 30 to the water filter chamber 101 on the outer peripheral side of the filter assembly 30, thereby flushing the filter assembly 30 and finally flowing to the sewage outlet 102.

[0116] Among them, the direction from the connecting part 721 to the blocking part 722 can be the direction from the water isolation ring 210 to the water distributor 60, or it can be that the blocking part 722 includes two parts that block the second water flow space 620 and the gap between the water isolation ring 210 and the water distributor 60, and the two parts are respectively located on both sides of the axial direction of the connecting part 721, and the part that blocks the second water flow space 620 is on the side of the water distributor 60 away from the water isolation ring 210.

[0117] In other embodiments, the water passing structure can be configured as a through-hole. In one embodiment, the water isolating ring 210 and the water distributor 60 are integrally formed, and the water passing structure can be configured as a through-hole provided in the water isolating ring 210 and the water distributor 60; in another embodiment, the water isolating ring 210 and the water distributor 60 are separately formed, and the water isolating ring 210 and the water distributor 60 are abutted and assembled to form a through-hole.

[0118] 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 rotating the reversing member 720 relative to the water distributor 60 and the water-isolating ring 210 to realize the switching between 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 between 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.

[0119] In one embodiment, the water distributor 60 and the water isolation ring 210 are arranged opposite to each other and spaced apart in the axial direction. In the filtering mode, the axial sides of the blocking portion 722 are respectively connected to the water distributor 60 and the water isolation ring 210, and are respectively connected to the first water flow space 610 and the inner circumference of the water isolation ring 210, and are spaced apart from the second water flow space 620. In the flushing mode, the connecting portion 721 is at least partially located between the water distributor 60 and the water isolation ring 210, and the blocking portion 722 covers the second water flow space 620. In this way, in the filtering mode, the water inlet 201 and the inner circumference of the reversing member 720 can be separated by the blocking portion 722 on the adjacent side of the water distributor 60 and the water isolation ring 210, and the water inlet 201 will also be connected to the water filter chamber 101 through the second water flow space 620 on this side. In the flushing mode, the water inlet 201 and the inner circumference of the reversing member 720 can be connected through the connecting portion 721 on the adjacent side of the water distributor 60 and the water isolation ring 210.

[0120] Specifically, the baffle portion 722 includes an annular main portion 7221 extending axially along the reversing member 720, and a baffle skirt 7222 disposed around the outer periphery of the annular main portion 7221. The annular main portion 7221 is connected to the connecting portion 721 and is slidably connected to the water distributor 60. The baffle skirt 7222 is located between the water distributor 60 and the water ring 210. In the flushing mode, the baffle skirt 7222 abuts the water distributor 60 at the outer periphery of the water flow space to seal the second water flow space 620. In the filtration mode, a gap is defined between the baffle skirt 7222 and the water distributor 60, separating the baffle skirt 7222 from the second water flow space 620. The outer periphery of the baffle skirt 7222 and the inner periphery of the filter bottle 10 form a gap, allowing the water inlet 201 to communicate with the second water flow space 620 through the gap.

[0121] In one embodiment, a filtering structure is provided around the circumference of the connecting portion 721. Specifically, the circumferential wall of the connecting portion 721 includes a porous structure that communicates with the water inlet 201. This allows raw water flowing from the water inlet 201 into the water filter chamber 101 to pass through during flushing mode, allowing the raw water to flow into the inner circumference of the filter assembly 30 and clean the filter assembly 30 from the inside out. However, this raw water may contain impurities. If not filtered, these impurities may be trapped within the inner circumference of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 switches from flushing mode to filtering mode, these impurities flow out of the water outlet 202 along with the filtered raw water, resulting in a poor initial filtration effect. Therefore, a filtering structure is also provided around the circumference of the connecting portion 721. This filtering structure is often configured as a filter screen, which is fixed to the inside or outside of the porous structure or integrally formed with the connecting portion 721. The filter screen can be bonded to the connecting portion 721. In other embodiments, the filtering structure may also be directly disposed on the periphery of the water isolation ring 210 by other fixed structures, so that the raw water flowing out of the water inlet 201 is filtered by the filtering structure and then flows to the connecting portion 721 .

[0122] In one embodiment, please refer to Figure 2 and Figure 10 The reversing member 720 further includes a hollow pipe section 723. The connecting portion 721, the blocking portion 722, and the hollow pipe section 723 are sequentially distributed along the axial direction. The connecting portion 721 is plugged into the water isolation ring 210, and the blocking portion 722 is plugged into the water distributor 60. The hollow pipe section 723 extends into the filter module 300. It can be understood that the axis of the hollow pipe section 723 is parallel to or even coincides with the axis of the filter bottle 10. The peripheral wall of the hollow pipe section 723 is provided with a through hole that communicates with the water filter chamber 101. In the flushing mode, the water flow entering the reversing member 720 from the connecting portion 721 can be guided to the inner periphery of the filter assembly 30 through the hollow pipe section 723.

[0123] In the filtering mode, raw water enters the water filter chamber 101 from the water inlet 201, flows to the filter assembly 30 through the second water flow space 620 of the water distributor 60, and flows from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water. After the filtered raw water enters the inner periphery of the filter assembly 30, it can enter the hollow pipe section 723, and then flow upward to the water outlet 202 under the action of water pressure; in the flushing mode, raw water enters the water filter chamber 101 from the water inlet 201, enters the inner periphery of the reversing member 720 through the connecting part 721, and continues to flow downward to the hollow pipe section 723, and then sprays toward the filter assembly 30, so that the cleaning water flow is sprayed from outside to inside along the radial direction of the filter assembly 30 to take away impurities on the filter assembly 30, thereby achieving the purpose of flushing the filter assembly 30, and then flows out from the sewage outlet 102.

[0124] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 The pre-filter also includes a movable part 730, which is 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 and the water outlet 202 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.

[0125] In the technical solution of the present utility model, the movable part 730 moves in the water filter chamber 101, so that the space on both sides of the movable part 730 switches between the blocked state and the connected state, thereby switching the pre-filter between the filtering mode and the flushing mode.

[0126] 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. In this mode, impurities attached to the filter component 30 can be cleaned, and then the sewage can flow out through the sewage outlet 102. At this time, the movable part 730 is in a position to connect the space on both sides, so that the water inlet 201 and the sewage outlet 102 can be connected.

[0127] When the pre-filter is in 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.

[0128] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7The movable part 730 includes a sealing portion 731 and a connecting portion 732 provided on the side of the sealing portion 731 away from the sewage outlet 102. The water inlet 201 and the sewage outlet 102 are respectively provided on both axial sides of the sealing portion 731. The outlet side 7302 of the flow outlet 7311 passes through the side of the sealing portion 731 close to the sewage outlet 102. The water inlet side 7301 of the flow outlet 7311 extends axially to the connecting portion 732 and radially passes through the radial side of the connecting portion 732. In the filtering mode, the blocking portion 540 blocks the water inlet side 7301 of the flow outlet 7311.

[0129] It can be understood that the axial direction of the sealing portion 731 is also the direction perpendicular or approximately perpendicular to its circumferential plane. The water inlet 201, the water outlet 202 and the filter assembly 30 are arranged on the same axial side of the sealing portion 731, and the sewage outlet 102 is located on the other axial side of the sealing portion 731. In the filtering mode, the space on both sides of the movable part 730 is mainly separated by the sealing portion 731, that is, two unconnected spaces are formed on both sides of the axial direction of the sealing portion 731.

[0130] It can be understood that the movement of the movable member 730 can change the relative position of the water inlet side 7301 of the flow port 7311 and the shielding portion 540. Specifically, Figure 4 As shown, in the filtering mode, the position of the movable member 730 will cause the blocking portion 540 to block the water inlet side 7301 of the flow port 7311, and the space on both sides of the blocking portion 731 axially can be isolated, so that the water inlet 201 and the sewage outlet 102 are not connected to each other; Figure 7 As shown, in the flushing mode, the position of the movable member 730 will cause the water inlet side 7301 of the flow port 7311 to be separated from the blocking portion 540, and the water inlet side 7301 of the flow port 7311 will also be exposed, so that the water inlet 201 can be connected to the sewage outlet 102 through the flow port 7311. Of course, in other embodiments, the flow port 7311 can also be an area that axially penetrates the blocking portion 731 and is located on the periphery of the connecting portion 732.

[0131] Without loss of generality, the connecting portion 732 is axially movable, and by changing the relative axial position of the water inlet side 7301 of the flow port 7311 and the shielding portion 540, the shielding portion 540 can be detachably blocked from the water inlet side 7301 of the flow port 7311. Of course, in other embodiments, the movable member 730 can also be rotatably arranged, and by changing the relative circumferential position of the water inlet side 7301 of the flow port 7311 and the shielding portion 540, the shielding portion 540 can be detachably blocked from the water inlet side 7301 of the flow port 7311.

[0132] Without loss of generality, in the filtering mode, the shielding portion 540 abuts against the blocking portion 731, that is, the blocking portion 731 can detachably abut against the side of the shielding portion 540 close to the sewage outlet 102. Thus, through the abutment and cooperation between the shielding portion 540 and the blocking portion 731, a positioning effect can be provided for the movement of the movable part 730, ensuring that the shielding portion 540 can reliably block the water inlet side 7301 of the flow outlet 7311.

[0133] Specifically, please participate Figure 4 、 Figure 7 and Figure 8 The shielding portion 540 is annular, and the water inlet side 7301 of the flow port 7311 is housed within the shielding portion 540 in the filtering mode, and is at least partially exposed in the flushing mode. Thus, in the filtering mode, the water inlet side 7301 of the flow port 7311 and the shielding portion 540 are disposed opposite each other and can be housed within the inner circumference of the shielding portion 540. The shielding portion 540 blocks the water inlet side 7301 of the flow port 7311 by surrounding the connecting portion 732 where the water inlet side 7301 of the flow port 7311 is located. Furthermore, the flow port 7311 is formed with multiple penetrating positions along the circumference of the connecting portion 732, thereby forming multiple water inlet sides 7301. The annular shielding portion 540 can block multiple water inlet sides 7301 simultaneously. Of course, in other embodiments, the shielding portion 540 may be in an arc shape and disposed corresponding to the water inlet side 7301 of the flow opening 7311 .

[0134] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 A sealing annular surface 711 is provided in the water filter chamber 101 corresponding to the sealing portion 731. The outer periphery of the sealing portion 731 is sealed and matched with the sealing annular surface 711 and can move axially relative to the sealing annular surface 711. That is, during the movement of the movable member 730, the outer periphery of the sealing portion 731 always maintains a sealed and matched state with the sealing annular surface 711. In the filtering mode, this helps to ensure the isolation of the space on both sides of the axial direction of the sealing portion 731, preventing water from seeping from the side where the water inlet 201 is located to the side where the sewage outlet 102 is located, thereby affecting the filtering process of the pre-filter. In addition, the sealing annular surface 711 can provide a guide for the movement of the sealing portion 731 to ensure that the sealing portion 731 switches smoothly between different positions. Of course, in other embodiments, the outer periphery of the sealing portion 731 can also be matched with the structural clearance of the circumferential ring.

[0135] Without loss of generality, please also refer to Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 11The outer periphery of the blocking portion 731 is provided with a sealing member 734, and the inner periphery and outer periphery of the sealing member 734 abut against the blocking portion 731 and the sealing annular surface 711, respectively. In this way, the blocking portion 731 can achieve a sealed fit with the sealing annular surface 711 on the outer periphery through the sealing member 734. The sealing member 734 can be filled between the outer periphery of the blocking portion 731 and the sealing annular surface 711 in an interference fit, but the interference fit should not be too large to ensure that the blocking portion 731 can move relatively smoothly along the sealing annular surface 711. Of course, in other embodiments, the outer periphery of the blocking portion 731 can also be formed with an elastic deformation portion, and the sealing annular surface 711 is sealed by the elastic deformation portion.

[0136] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 The pre-filter further includes a reversing bottom shell 710, which is fixedly mounted in the water filter chamber 101. The blocking portion 731 extends into the inner side of the reversing bottom shell 710 and is slidably connected to the reversing bottom shell 710. It can be understood that both axial sides of the reversing bottom shell 710 are provided with passages that do not interfere with the cooperation between the movable part 730 and the shielding part 540, or the communication between the flow port 7311 and the sewage outlet 102. In this embodiment, the sliding cooperation between the reversing bottom shell 710 and the blocking portion 731 can provide a guiding effect for the axial movement of the movable part 730. Specifically, the outer periphery of the blocking portion 731 can be slidably engaged with the inner periphery of the reversing bottom shell 710.

[0137] Without loss of generality, the inner circumferential surface of the reversing bottom housing 710 serves as the sealing annular surface 711, and the blocking portion 731 slidably and sealingly engages with the inner circumferential surface of the reversing bottom housing 710. In this embodiment, the sealing engagement is achieved through the inner circumferential surface of the reversing bottom housing 710 and the outer circumference of the blocking portion 731. Furthermore, the inner circumference of the reversing bottom housing 710 provides guidance for the movement of the blocking portion 731, thereby ensuring that the blocking portion 731 smoothly switches between different positions. 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 slidably and sealingly engage with each other.

[0138] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8The pre-filter further comprises an exoskeleton 50, which is sleeved over the filter assembly 30. The exoskeleton 50 comprises a side frame 512 and a bottom plate 511. The bottom plate 511 is provided with a discharge port connected to the water inlet 201. The movable member 730 comprises a blocking portion 731. The discharge port and the sewage outlet 102 are located on either side of the blocking portion 731 in the axial direction. It can be understood that the water filter chamber 101 is divided into two spaces by the bottom plate 511. The filter assembly 30 is mounted on a side of the bottom plate 511 close to the water inlet 201, with the side frame 512 also located on this side. The blocking portion 731 is located on a side of the bottom plate 511 close to the sewage outlet 102. The spaces on both sides are connected via the discharge port on the bottom plate 511. In the filtering mode, the water inlet 201 is connected to the sewage outlet 102 via the discharge port and the flow port 7311 in sequence.

[0139] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 The outer frame 50 is provided with an annular shielding portion 540. The water inlet side 7301 of the flow port 7311 is disposed on the inner circumference of the shielding portion 540, and the discharge port is disposed on the outer circumference of the shielding portion 540. Specifically, the discharge port 503 is located on the outer circumference of the shielding portion 540. In the filtering mode, the shielding portion 540 blocks the water inlet side 7301 of the flow port 7311 on its inner circumference. The portion of the blocking portion 731 located on the outer circumference of the shielding portion 540 can separate the discharge port from the sewage outlet 102.

[0140] Specifically, the reversing bottom shell 710 is fixedly connected to a side of the bottom plate 511 near the drain outlet 102, and the drain outlet is provided corresponding to the inner circumference of the reversing bottom shell 710. Because the outer circumference of the blocking portion 731 is sealed with the inner circumference of the reversing bottom shell 710, and the drain outlet is also located on the inner circumference of the reversing bottom shell 710, when the water inlet side 7301 of the flow port 7311 is blocked by the blocking portion 540, the flow path between the drain outlet and the drain outlet 102 is also cut off by the blocking portion 731. When the water inlet side 7301 of the flow port 7311 is exposed outside the blocking portion 540, the drain outlet can be connected to the drain outlet 102 through the flow port 7311. Of course, in other embodiments, the blocking portion 731 may be provided with a protrusion corresponding to the drain outlet, and the protrusion may be inserted into the drain outlet to block the drain outlet accordingly.

[0141] Without loss of generality, the movable member 730 and the reversing member 720 are transmission-connected. Thus, the movable member 730 and the reversing member 720 can be linked. While the reversing member 720 switches the flow path between the water inlet 201 and the filter assembly 30, the movable member 730 can also change the communication relationship between the sewage outlet 102 and the water inlet 201. Of course, in other embodiments, the reversing member 720 and the movable member 730 may not be transmission-connected, but may be driven by different drive sources and cooperate with each other to form the flushing flow path and the filtration flow path.

[0142] In one embodiment, the movable member 730 is fixedly connected to the reversing member 720. Thus, when the reversing member 720 is driven to move axially, it can drive the movable member 730 to move axially synchronously, causing the blocking portion 731 to move accordingly. Of course, in other embodiments, the reversing member 720 and the movable member 730 can also be connected through an intermediate structure. For example, the reversing member 720 and the movable member 730 can be plugged together to allow axial movement, with an elastic member connected between them to transmit axial movement.

[0143] For more details, please refer to Figure 4 and Figure 7 , the reversing member 720 is fixedly connected to the inner periphery of the filter assembly 30 through the hollow pipe section 723 and the connecting portion 732 of the movable member 730. Specifically, the connecting portion 732 extends into the filter assembly 30 and is connected to the hollow pipe section 723. Among them, the movable member 730 and the reversing member 720 can be connected by threads, that is, one of the hollow pipe section 723 and the connecting portion 732 is provided with a screw hole, and the other is provided with an external thread, and the two are fixedly connected by screw connection. In this way, the movable member 730 and the reversing member 720 are formed separately, and different materials can be selected for processing and forming to meet the requirements of reversing and blocking respectively. Of course, in other embodiments, the reversing member 720 and the blocking portion 731 can also be formed as one piece.

[0144] In one embodiment, at least one of the reversing member 720 and the movable member 730 is connected to an elastic member 1003. Under the action of the elastic member 1003, both the reversing member 720 and the movable member 730 can naturally maintain the position corresponding to the filtering mode. When the pre-filter switches from filtering mode to flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened, resulting in a pressure difference between the water inlet 201 and the sewage outlet 102. The side of the movable member 730 near the water inlet 201 will be subjected to pressure, causing the movable member 730 to move toward the sewage outlet 102, thereby driving the reversing member 720 to move accordingly, forming a flushing flow path from the water inlet 201 to the sewage outlet 102 in the pre-filter. At the same time, the elastic member 1003 will undergo elastic deformation. When the pre-filter switches from the flushing mode to the filtering mode, the sewage outlet 102 is closed and the water outlet 202 is opened, and the elastic member 1003 will restore its deformation, thereby driving the reversing member 720 and the movable member 730 to return to the position corresponding to the filtering mode. That is, the reversing member will return to the position corresponding to the filtering mode, and the movable member 730 will return to the position separating the spaces on both sides. Thereafter, without being subjected to external forces, the reversing member and the movable member 730 can be stably in their current positions to provide a stable working environment for the filtering process of the pre-filter.

[0145] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 A first elastic member is provided between the reversing member 720 and the filter assembly 30. Specifically, the first elastic member 1003 is provided between the reversing member 720 and the filter assembly 30, such that one end of the first elastic member 1003 is connected to the reversing member 720 and the other end is connected to the filter assembly 30, thereby facilitating the installation of the first elastic member 1003. The other end of the first elastic member 1003 can be connected to the filter portion of the filter assembly 30 or to the water distributor 60.

[0146] The first elastic member 1003 can be configured as a spring, which not only facilitates the installation of the first elastic member 1003 but also reduces the interference of the first elastic member 1003 with the water flow inside the water filter chamber 101. In other embodiments, the first elastic member 1003 can also be configured as an elastic block or an elastic sleeve. In this case, the first elastic member 1003 is provided with an escape space for the water flow to pass through.

[0147] Furthermore, the first elastic member 1003 is installed between the reversing member 720 and the water distributor 60. Specifically, because water needs to flow between the filtering portion of the filter assembly 30 and the reversing member 720, especially in the flushing mode, the reversing member 720 sprays water from the inner periphery of the filter assembly 30 to the outside thereof to flush the filter assembly 30. Therefore, the presence of the first elastic member 1003 may affect the impact strength of the water flow, and therefore, the first elastic member 1003 is provided between the reversing member 720 and the water distributor 60.

[0148] Furthermore, one end of the first elastic member 1003 is located inside the annular main portion 7221, helping to ensure stable installation of the first elastic member 1003, reducing the possibility of accidents with the first elastic member 1003, and further reducing the interference of the first elastic member 1003 with the water flow within the water filter chamber 101. In other embodiments, the first elastic member 1003 can also be located outside the annular main portion 7221. In this case, the end of the first elastic member 1003 facing the connecting portion 721 can be sleeved onto the annular main portion 7221, thereby facilitating the annular main portion 7221 to guide the expansion and contraction of the first elastic member 1003. In this case, the first elastic member 1003 and the barrier skirt 7222 do not need to be directly connected. One end of the first elastic member 1003 abuts the side of the barrier skirt 7222 facing the water distributor 60.

[0149] In one embodiment, a first mounting groove is defined on the outer circumference of the first water passage, and a second mounting groove is defined on the inner circumference of the annular main body. One end of the first elastic member is mounted in the first mounting groove, and the other end is mounted in the second mounting groove. This ensures stable mounting of the first elastic member, thereby ensuring the switching of the reversing member between different positions.

[0150] Specifically, the outer peripheral wall of the second mounting groove, also known as the annular main body, slidably abuts the outer peripheral side of the first mounting groove. This allows the first mounting groove to guide the axial movement of the commutator main body. One end of the first elastic member is adapted to fit outside the inner peripheral wall of the first mounting groove, while the other end is adapted to fit outside the inner peripheral wall of the second mounting groove, ensuring the installation stability of the first elastic member. Without loss of generality, when the commutator is in the position corresponding to the filtering mode, an axial spacing exists between the inner peripheral wall of the first mounting groove and the commutator. When the commutator is switched to the position corresponding to the flushing mode, the commutator abuts the inner peripheral wall of the first mounting groove. Furthermore, a first water flow space is formed on the inner peripheral side of the inner peripheral wall of the first mounting groove.

[0151] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7A second elastic member is provided on the side of the movable member 730 that is closer to the sewage outlet 102. This provides a mounting base for the second elastic member 1004 through the structure at the bottom of the filter bottle 10, preventing interference with other structures. Of course, in other embodiments, the second elastic member 1004 can also be provided on the side of the movable member 730 that is farther from the sewage outlet 102.

[0152] Specifically, the second elastic member 1004 is disposed on a side of the blocking portion 731 near the sewage outlet 102. It will be appreciated that the second elastic member 1004 is hollow, and the flow port 7311 and the sewage outlet 102 are disposed corresponding to the inner circumferential space of the second elastic member 1004. Even when the second elastic member 1004 is compressed to a clearance-free fit, sewage can still be discharged to the sewage outlet 102 through the inner circumferential space of the second elastic member 1004. Alternatively, the flow channel between the outlet side of the flow port 7311 and the sewage outlet 102 may bypass the second elastic member 1004.

[0153] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 、 Figure 11 and Figure 12 The sealing portion 731 has a mounting protrusion 7312 protruding from one side thereof near the sewage outlet 102, and the second elastic member 1004 is sleeved on the mounting protrusion 7312. In this way, the second elastic member 1004 can be positioned by the mounting protrusion 7312, making it difficult for the second elastic member 1004 to shift, thereby being stably installed between the sealing 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 be provided in the sealing portion 731 to accommodate the end of the second elastic member 1004, or the second elastic member 1004 can be embedded in the sealing portion 731.

[0154] Without loss of generality, the mounting protrusion 7312 and the connecting portion 732 are coaxially arranged, and the outlet side 7302 of the flow port 7311 passes through the mounting protrusion 7312. In this way, the second elastic member 1004 can be centrally connected to the blocking portion 731, and the inner peripheral space of the second elastic member 1004 can be arranged relative to the outlet side 7302 of the flow port 7311 and the sewage outlet 102 without interfering with the communication between the outlet side 7302 of the flow port 7311 and the sewage outlet 102. Of course, in other embodiments, the flow port 7311 can pass through the side of the blocking portion 731, and multiple mounting protrusions 7312 can be arranged around the flow port 7311, and a second elastic member 1004 can be collectively sleeved on the outside of multiple mounting protrusions 7312, or multiple second elastic members 1004 can be sleeved on multiple mounting protrusions 7312 in a one-to-one correspondence.

[0155] Without loss of generality, please also refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 The housing includes a drain assembly 80, the drain port 102 is formed in the drain assembly 80, and the drain assembly 80 includes a drain valve 820. The second elastic member 1004 is located between the movable member 730 and the drain valve 820, with both ends of the second elastic member 1004 abutting the movable member 730 and the drain assembly 80, respectively. In this manner, the drain port 102 can be controlled open and closed via the drain valve 820. The abutment of the second elastic member 1004 against the drain assembly 80 allows the second elastic member 1004 to be relatively centrally positioned relative to the movable member 730, that is, relative to the fixed connection portion 732 and the hollow tube section 723, facilitating transmission between the movable member 730 and the reversing member 720. Of course, in other embodiments, the end of the second elastic member 1004 away from the movable member 730 may abut the filter bottle 10 or the reversing bottom housing 710.

[0156] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 The sewage discharge assembly 80 includes a connector 810, which is mounted on the sewage outlet 102. The sewage discharge valve 820 is connected to the connector 810, and the second elastic member 1004 abuts against the connector 810. Specifically, the reversing bottom shell 710 is located between the outer frame 50 and the sewage outlet 102, with one axial side mounted on the outer frame 50 and the other axial side abutting the filter bottle 10 and connected to the connector 810. One end of the second elastic member 1004 abuts against the blocking portion 731, and the other end abuts against the connector 810. It can be understood that the connecting member 810 will also be hollow, and the sewage will flow to the sewage valve 820 through the inner peripheral space of the connecting member 810. The second elastic member 1004 abuts against the connecting member 810, which can make the inner peripheral space of the second elastic member 1004 and the inner peripheral space of the connecting member 810 relative and centralized, ensuring the smoothness of sewage discharge. At the same time, it is beneficial to reduce the size of the second elastic member 1004, thereby saving the production cost of the pre-filter.

[0157] Without loss of generality, the second elastic member 1004 is configured as a compression spring. When the water inlet 201 and the water outlet 202 are open and the sewage outlet 102 is closed, that is, when the pre-filter is in the filtering mode, the second elastic member 1004 can be in a natural state, that is, the second elastic member 1004 maintains its original length, and the second elastic member 1004 can also be in a compressed state to provide a certain pre-tightening force to the movable member 730 to ensure that the blocking part 731 reliably isolates the chambers on both sides; when the water outlet 202 is switched to the closed state and the sewage outlet 102 is switched to the open state, that is, when the pre-filter is switched to the flushing mode, the pressure difference on both sides of the blocking part 731 will indirectly act on the second elastic member 1004, causing the second elastic member 1004 to be compressed. In this way, when the pre-filter is switched to the filtering mode again, that is, after the pressure difference on both sides of the blocking part 731 disappears, the elastic force of the second elastic member 1004 will act on the blocking part 731, thereby driving the movable member 730 to return to its previous position. Of course, in other embodiments, the second elastic member 1004 may also be an elastic silicone sleeve or an elastic rubber sleeve.

[0158] It should be noted that the multiple indicated in this solution should be understood as greater than or equal to two unless otherwise specified.

[0159] The present invention also provides a water system including a prefilter. The specific structure of the prefilter is similar to that of the above-described embodiments. Since the present water system utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects of the technical solutions of the above-described embodiments, and therefore will not be further detailed here. The water system includes at least the relevant components from the prefilter to the water supply terminal. For example, the water system may include household appliances such as a water heater, a dishwasher, and a water dispenser, as well as accessories such as water pipes for household water supply.

[0160] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet connected to the water filter cavity, and the filter bottle is provided with a sewage outlet connected to the water filter cavity on a side away from the valve head; A filter assembly is arranged in the water filter cavity; A reversing member and a movable member in transmission connection, wherein the reversing member is movably inserted into the filter assembly to enable the pre-filter to switch between a filtering mode and a flushing mode; The reversing member is hollow, and 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 water inlet, the water outlet and the filter assembly are arranged on one side of the movable member, and the sewage outlet is arranged on the other side of the movable member. In the filtering mode, the flushing flow path between the water inlet and the reversing member is cut off by the blocking portion, and the spaces on opposite sides of the movable member are separated; In the flushing mode, the flushing flow path between the water inlet and the reversing member is connected through the blocking portion, and the spaces on opposite sides of the movable member are connected; At least one of the reversing member and the movable member is connected to an elastic member. Under the action of the elastic member, the reversing member and the movable member can naturally maintain positions corresponding to the filtering mode.

2. The prefilter according to claim 1, wherein The filter assembly is fixedly installed in the water filter cavity, and a first elastic member is provided between the reversing member and the filter assembly.

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

4. The prefilter according to claim 3, characterized in that The filter assembly includes a water distributor and a filter module, the water distributor is connected to a side of the filter module close to the water isolation ring, the water isolation ring and the water distributor are jointly constructed to form a water flow structure, and the water flow structure is connected to the water inlet; The reversing member further includes a hollow pipe section, the connecting portion, the blocking portion and the hollow pipe section are sequentially distributed along the axial direction, the connecting portion is plugged into the water separator, the blocking portion is plugged into the water distributor, and the hollow pipe section extends into the filter module; On adjacent sides of the water distributor and the water isolation ring, the water flow structure is isolated from the connecting portion in the filtering mode and is connected to the connecting portion in the flushing mode.

5. The pre-filter according to claim 4, characterized in that A first elastic member is provided between the reversing member and the water distributor.

6. The prefilter according to claim 4, characterized in that A water passage cavity is formed inside the filter module, a first water passage is provided in the axial direction of the filter module to communicate with the water passage cavity, a second water passage is provided in the circumferential direction of the filter module to communicate with the water passage cavity, and a filter element is provided in the second water passage; The water distributor has a first water flow space corresponding to the first water flow port and a second water flow space corresponding to the second water flow port. The second water flow space is provided with guide blades inclined relative to the circumferential direction. The water distributor and the water isolation ring are arranged opposite to and spaced apart in the axial direction. In the filtering mode, the axial sides of the baffle are respectively connected to the water distributor and the water isolation ring, and are respectively connected to the first water flow space and the inner circumference of the water isolation ring, and are spaced apart from the second water flow space. In the flushing mode, the connecting part is at least partially located between the water distributor and the water isolation ring, and the baffle covers the second water flow space.

7. The prefilter according to claim 6, characterized in that The barrier portion includes an annular main portion extending axially along the reversing member, and a barrier skirt arranged on the outer periphery of the annular main portion. The connecting portion and the annular main portion are distributed axially, and the annular main portion and the water distributor are movably plugged in and matched.

8. The pre-filter according to claim 7, characterized in that A first mounting ring groove is provided on the outer circumference of the first water flow space, a second mounting ring groove is provided on the inner circumference of the annular main body, and the elastic member includes a first elastic member, one end of the first elastic member is installed in the first mounting ring groove, and the other end is installed in the second mounting ring groove.

9. The prefilter according to claim 1, wherein: A second elastic member is connected to a side of the movable member close to the sewage outlet.

10. The pre-filter according to claim 9, characterized in that The pre-filter also includes a sewage discharge assembly, the sewage outlet is formed in the sewage discharge assembly, the sewage discharge assembly includes a sewage discharge valve, the second elastic member is located between the movable member and the sewage discharge valve, and the two ends of the second elastic member are respectively in contact with the movable member and the sewage discharge assembly.

11. The prefilter according to claim 10, wherein: The sewage discharge assembly includes a connecting piece, the connecting piece is installed at the sewage discharge port, the sewage discharge valve is connected to the connecting piece, and the second elastic piece abuts against the connecting piece.

12. The pre-filter according to claim 1, wherein A shielding portion is fixedly provided in the water filter chamber, and the movable part includes a sealing portion and a connecting portion provided on the side of the sealing portion away from the sewage outlet, the water inlet and the sewage outlet are respectively provided on both axial sides of the sealing portion, and the movable part is provided with a flow port, the water outlet side of the flow port penetrates to the side of the sealing portion close to the sewage outlet, the water inlet side of the flow port extends axially to the connecting portion, and radially penetrates the radial side surface of the connecting portion. In the filtering mode, the shielding part blocks the water inlet side of the flow port.

13. The pre-filter according to claim 12, wherein: The connecting portion is axially movable so that the shielding portion can be detachably blocked on the water inlet side of the flow opening.

14. The pre-filter according to claim 13, wherein: The shielding portion is annular, and the water inlet side of the flow port is accommodated in the shielding portion in the filtering mode and is at least partially exposed to the outside in the flushing mode.

15. The pre-filter according to claim 12, wherein: A mounting protrusion is protruded from one side of the blocking portion close to the sewage outlet, and a second elastic member is sleeved on the mounting protrusion.

16. The pre-filter according to claim 15, characterized in that The mounting protrusion and the connecting portion are coaxially arranged, and the water outlet side of the flow port passes through the mounting protrusion.

17. The pre-filter according to claim 12, wherein: A sealing annular surface is provided in the water filtering cavity corresponding to the blocking portion. The outer periphery of the blocking portion is sealed and matched with the sealing annular surface and can move relative to the sealing annular surface along the axial direction.

18. The pre-filter according to claim 17, wherein: The pre-filter also includes a reversing bottom shell, which is fixedly installed in the water filter chamber. The reversing bottom shell is hollow, and the inner circumferential surface of the reversing bottom shell is the sealing annular surface. The sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

19. The pre-filter according to claim 12, wherein: The pre-filter also includes an exoskeleton, which is sleeved on the outside of the filter assembly. The exoskeleton is connected to a reversing bottom shell on the side close to the sewage outlet. The blocking part is located in the reversing bottom shell. The shielding part is provided on the exoskeleton, and the connecting part extends into the exoskeleton.

20. The pre-filter according to claim 1, wherein The filter assembly includes a plurality of filter modules connected in sequence, 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, a filter element is provided in the second water flow port, the filter element is annularly arranged, and 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.

21. The pre-filter according to claim 20, characterized in that The filter module includes two support frames distributed along the axial direction, the water flow cavity is formed between the two support frames, each support frame is provided with the second water flow port, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

22. The pre-filter according to claim 21, wherein The support frame includes an oblique support portion, and the two ends of the oblique support portion are respectively connected to a first ring portion and a second ring portion. The two oblique support portions of the same filter module are connected through the second ring portion. The inner periphery of the first ring portion is provided with the first water outlet, and the second water outlet is provided on the oblique support portion.

23. The pre-filter according to claim 22, wherein: Each of the support frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

24. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 23.

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