Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water system, and relates to the technical field of filters, the pre-filter comprises a valve head, a filter bottle and a filter assembly, the valve head and the filter bottle are in threaded connection, a water filtering cavity is formed in the filter bottle, the valve head is provided with a water inlet and a water outlet which are communicated with the water filtering cavity, a sewage draining exit is formed in the side, away from the valve head, of the filter bottle, and the water draining exit is communicated with the water filtering cavity. The filtering assembly comprises a plurality of filtering modules connected in the axial direction, a water passing cavity is formed in each filtering module, a first water passing opening communicated with the water passing cavity is formed in the filtering module in the axial direction, a second water passing opening communicated with the water passing cavity is formed in the filtering module in the circumferential direction, the second water passing opening is provided with a filtering piece, and the filtering piece is connected with the filtering module through the first water passing opening. The filtering piece is arranged in an annular shape and is provided with an inner annular edge and an outer annular edge, and the outer annular edge is located on one side of the inner annular edge in the axial direction. According to the technical scheme, the filtering effect of the filtering assembly is guaranteed, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

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

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

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

[0005] A valve head and a filter bottle are screwed together, the filter bottle forms 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 on a side away from the valve head; and

[0006] A filter assembly is arranged in the water filter cavity, and the filter assembly includes a plurality of filter modules connected along the axial direction, a water passage cavity is formed inside the filter module, a first water passage port connected to the water passage cavity is provided in the axial direction of the filter module, a second water passage port connected to the water passage cavity is provided in the circumferential direction of the filter module, a filter element is provided in the second water passage port, the filter element is arranged in an annular shape, and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one axial side of the inner ring edge.

[0007] In one embodiment, the filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, each support frame is provided with the second water passage, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

[0008] In one embodiment, the supporting skeleton includes an oblique supporting portion, the two ends of the oblique supporting portion are respectively connected to a first ring portion and a second ring portion, the two oblique supporting portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique supporting portion.

[0009] In one embodiment, the oblique support portion is formed with a plurality of the second water outlets distributed at intervals, and the filter module is provided with a filter element corresponding to each of the support frames, and the filter element is stacked on the surface of the oblique support portion.

[0010] In one embodiment, each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

[0011] In one embodiment, the pre-filter further comprises an outer frame, and the outer frame is rotatably mounted outside the filter assembly.

[0012] In one embodiment, the pre-filter further comprises an impeller body coaxially connected to the outer frame, the impeller body is disposed in the water filter chamber, and the impeller body is relatively fixed to the outer frame in the circumferential direction.

[0013] In one embodiment, the pre-filter further comprises a mounting seat fixedly mounted on the water filter chamber, the mounting seat is provided with a water inlet and a water outlet communicating with the water filter chamber, and the impeller body is rotatably mounted in the mounting seat.

[0014] In one embodiment, the impeller body includes an impeller shaft, a limiting groove is provided in the mounting seat, a ball is installed in the limiting groove, and the impeller body is rotatably inserted in the limiting groove and rolls against the ball.

[0015] In one embodiment, the water inlet is arranged on a circumferential side of the mounting seat, and the drain outlet is arranged on an axial side of the mounting seat close to the sewage outlet.

[0016] In one embodiment, a flat portion is provided at one end of the impeller shaft, and a snap-in groove is correspondingly provided at the outer frame, and the flat portion is adapted to snap-in into the snap-in groove.

[0017] In one embodiment, the outer frame is provided with a cleaning structure, and the cleaning mechanism is used to clean at least one of the filter element and the filter bottle.

[0018] In one embodiment, the cleaning structure includes an inner cleaning brush protruding from the inner circumference of the outer skeleton, the inner cleaning brush includes a cleaning portion, the cleaning portion extends in the axial direction of the outer skeleton, the cleaning portion is arranged corresponding to the filter element, and the cleaning portion is used to clean the filter element.

[0019] In one embodiment, the cleaning portion is provided on a side portion of the inner cleaning brush distributed in the axial direction of the outer frame.

[0020] In one embodiment, the cleaning portion is inclined toward a side of the filter element corresponding to the filter element.

[0021] In one embodiment, the cleaning portion includes a plurality of brush strips spaced apart along a radial direction of the outer skeleton.

[0022] In one embodiment, the cleaning portion is configured as a brush piece protruding along the axial direction of the outer skeleton and extending along the radial direction of the outer skeleton.

[0023] In one embodiment, the cleaning structure includes an outer cleaning brush disposed on the outer peripheral side of the outer frame, and a gap between the outer cleaning brush and the inner wall of the filter bottle is 0 to 0.3 mm.

[0024] In one embodiment, the cleaning portion extends along the circumferential direction of the outer frame and is inclined relative to the axial direction of the outer frame.

[0025] In one embodiment, a plurality of cleaning parts are distributed in the axial direction of the outer frame, one cleaning part is arranged corresponding to one filter element, and two adjacent cleaning parts are arranged at an acute angle.

[0026] In one embodiment, the inner cleaning brush further comprises a base portion, the base portion is protrudingly disposed on the inner circumference of the outer frame, and the cleaning portion is connected to the outer circumference of the base portion.

[0027] In one embodiment, the pre-filter also includes a sewage discharge assembly, the sewage discharge port is formed in the sewage discharge assembly, the sewage discharge assembly includes a connecting piece and a sewage discharge valve, the filter bottle is provided with an installation port on the side away from the valve head, the connecting piece is installed in the installation port, and the sewage discharge valve is located on the outside of the filter bottle.

[0028] In one embodiment, the pre-filter further comprises an impeller assembly, wherein the impeller assembly comprises a mounting seat fixedly mounted in the water filter chamber and an impeller body rotatably mounted in the mounting seat, and the connecting member is snap-connected to the mounting seat.

[0029] In one embodiment, the connecting member is provided with a limiting protrusion, the limiting protrusion abuts against the end side of the mounting port in the filter bottle, the mounting seat is provided with a claw protruding toward the limiting protrusion, the limiting protrusion is provided with a slot, and the claw is engaged in the slot.

[0030] In one embodiment, the pre-filter also includes a sewage discharge assembly and an outer cover, wherein the sewage discharge assembly is installed on a side of the filter bottle away from the valve head, and the outer cover is sleeved on a side of the filter bottle away from the valve head, and one axial side of the outer cover abuts against an outer peripheral wall of the filter bottle, and the other side is clamped on the outer peripheral side of the sewage discharge assembly.

[0031] In one embodiment, a driving knob is provided on the outer peripheral side of the outer cover, the sewage discharge assembly includes a sewage discharge valve, the sewage discharge valve is used to control the opening and closing of the sewage discharge port, and the driving knob is drivingly connected to the sewage discharge valve.

[0032] In one embodiment, the valve head and the filter bottle are sealed by a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are respectively located on both axial sides of the threaded connection between the valve head and the filter bottle.

[0033] In one embodiment, the filter bottle is provided with an external thread section, and is threadedly connected to the valve head through the external thread section, the first sealing ring is located on a side of the external thread section close to the water inlet, and the second sealing ring is located on a side of the external thread section away from the water inlet, the axial interference amount of the first sealing ring is smaller than the axial interference amount of the second sealing ring, and the radial interference amount of the first sealing ring is larger than the radial interference amount of the second sealing ring.

[0034] In one embodiment, a water inlet channel and a water outlet channel are formed in the valve head, the water inlet channel is connected to the water filter chamber through the water inlet, and the water outlet channel is connected to the water filter chamber through the water outlet;

[0035] The filter assembly also includes a water distributor fixedly mounted on the filter bottle, one axial side of the water distributor is plugged into the water outlet, and the other side is connected to the filter module;

[0036] The water distributor is provided with a first water flow space and a second water flow space arranged outside the first water flow space. The first water flow port and the water outlet are connected through the first water flow space, and the second water flow port and the water inlet are connected through the second water flow space. The second water flow space is provided with guide blades inclined relative to the axial direction.

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

[0038] In the technical solution of the present invention, in the filtering mode, the water inlet and the water outlet are opened, and the sewage outlet is closed. After the water entering the water inlet passes through the first water flow space and enters the water filter cavity, it will flow from the outer periphery of the filter component through the second water flow port of the filter component and enter the inner periphery of the filter component, thereby being filtered by the filter element, and impurities are intercepted by the filter element. The filtered water will flow through the second water flow space to the inner peripheral side of the water isolation ring, and finally flow to the water outlet; in the flushing mode, the water inlet and the sewage outlet are opened, and the water outlet is closed. The water entering the water inlet still passes through the first water flow space and enters the water filter cavity. After the water flow flushes the surface of the filter element, the sewage will be discharged through the sewage outlet, thereby discharging the impurities previously intercepted, which can reduce the attachment of impurities to the filter element, so as to ensure the filtering effect of the filter element and improve the service life of the pre-filter. Furthermore, at the same axial height, the filtering area of ​​the filter element can be increased, which means that at the same flow rate, the filter element of this scheme can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filtering area of ​​the filter element of this scheme is large enough, even if a local area of ​​the filter element is clogged, the remaining area of ​​the filter element can continue to withstand a larger flow load, thereby ensuring the filtering effect of the filter assembly, helping to extend the service life of the filter module, reduce the replacement frequency, and thus reduce maintenance costs. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the external structure of an embodiment of a pre-filter provided by the present invention;

[0041] Figure 2 A schematic structural diagram of an embodiment of a valve head of a pre-filter provided by the present invention;

[0042] Figure 3 A schematic structural diagram of an embodiment of a filter bottle of a pre-filter provided by the present invention;

[0043] Figure 4 A schematic cross-sectional structure diagram of an embodiment of a pre-filter provided by the present invention;

[0044] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0045] Figure 6 for Figure 4 A partial enlarged view of the middle part;

[0046] Figure 7 A partial structural cross-sectional view of an embodiment of a pre-filter provided by the present invention;

[0047] Figure 8 A schematic structural diagram of an embodiment of a filter assembly of a pre-filter provided by the present invention;

[0048] Fig. 9 for Figure 8 A schematic diagram of the connection structure of two filter modules in an embodiment;

[0049] Fig.10 for Figure 8 A schematic diagram of the connection structure of another embodiment of two filter modules;

[0050] Fig.11 for Figure 8 An exploded structural diagram of an embodiment of a filtering module in FIG.

[0051] Fig.12 A schematic structural diagram of an exoskeleton of a pre-filter provided by the present invention from a first perspective of an embodiment;

[0052] Fig.13 for Fig.12 A schematic diagram of the structure of the exoskeleton from another perspective;

[0053] Fig.14 A schematic structural diagram of an impeller assembly of an embodiment of a pre-filter provided by the present invention;

[0054] Fig.15 for Fig.14 A schematic diagram of the structure of the impeller assembly from another perspective;

[0055] Fig.16 A partial structural cross-sectional view of an embodiment of an exoskeleton of a pre-filter provided by the present invention;

[0056] Fig.17 Schematic diagrams of the structures of two embodiments of the cleaning structure of the pre-filter provided by the present invention;

[0057] Fig.18 A schematic diagram of the coordination state of a cleaning structure of a pre-filter and a filter assembly according to an embodiment of the present invention;

[0058] Fig.19 A schematic diagram of another embodiment of the pre-filter of the present invention, in which the cleaning structure is installed on the outer frame;

[0059] Fig. 20 for Fig.19 A schematic cross-sectional view of an embodiment of an exoskeleton;

[0060] Fig.21 Schematic diagrams of the cleaning structure of the pre-filter provided by the present invention at some viewing angles;

[0061] Fig. 22 A schematic diagram of the matching state of another embodiment of the cleaning structure of the pre-filter and the filter assembly provided by the present invention;

[0062] Fig.23 A schematic structural diagram of the cleaning structure of the pre-filter provided by the present invention from another perspective;

[0063] Fig.24 A schematic diagram of the assembly structure of a cleaning structure and an outer frame of a pre-filter provided by the present invention.

[0064] Description of Figure Numbers:

[0065] 10. filter bottle; 101. water filter chamber; 102. mounting port; 103. annular groove; 104. first step; 110. outer cover;

[0066] 20. Valve head; 21. Metal shell; 22. Plastic lining;

[0067] 201. Water inlet; 202. Water outlet;

[0068] 203, second step; 204, third step;

[0069] 210, water inlet channel; 220, water outlet channel;

[0070] 30. Filter assembly; 300. Filter module; 301. First connection structure; 302. Second connection structure;

[0071] 310, supporting frame; 311, oblique supporting portion; 312, first ring portion; 313, second ring portion;

[0072] 320, filter element; 330, first water outlet; 340, water passage cavity; 350, second water outlet;

[0073] 40, impeller assembly; 402, water inlet; 404, drain outlet;

[0074] 410, mounting seat; 411, claw; 412, limiting groove; 413, ball;

[0075] 440, impeller body; 441, impeller shaft; 442, flat position;

[0076] 50. outer frame; 501. snap-in slot;

[0077] 60, water distributor; 601, first water flow space; 602, second water flow space; 603, guide vane; 610, first connecting ring; 620, second connecting ring;

[0078] 80, sewage discharge assembly; 801, sewage discharge port; 810, connecting piece; 811, limiting convex part; 820, driving knob;

[0079] 90, cleaning structure; 910, inner cleaning brush; 911, cleaning part; 912, base part; 920, outer cleaning brush; 930, mounting part;

[0080] 1001, a first sealing ring; 1002, a second sealing ring.

[0081] 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

[0082] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0083] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0084] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0085] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, which are used to filter large particles of tap water. This not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves the health of residents. The pre-filter is the first coarse filtration device in the whole-house water purification system. It is a physical filtration device used to protect the safety of back-end water use.

[0086] The present invention proposes a pre-filter, which has a filtering mode and a flushing mode. In the filtering mode, the pre-filter can filter large particles before using the water end. In the flushing mode, the pre-filter can clean the filtering components inside it to discharge the large particles previously intercepted, thereby eliminating the need to manually disassemble and clean the pre-filter, thereby increasing the service life of the pre-filter.

[0087] See also Figures 1 to 4 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 801 on the side away from the valve head 20.

[0088] The water inlet 201 is connected to the water supply end of the water use system, and the water outlet 202 is connected to the water use end of the water use system, thereby filtering the raw water flowing from the water supply end to the water use end. It should be noted that the water supply end can be a water pipe, a water tower or a well water, and the water use end can be a faucet, a shower or a drinking water outlet, and this application does not make specific limitations on this.

[0089] Among them, the connection method between the valve head 20 and the filter bottle 10 can be a threaded connection. Without loss of generality, an external thread section is formed at the port of the filter bottle 10 close to the valve head 20, that is, the outer periphery of the port of the filter bottle 10 is provided with a thread, and correspondingly, the inner periphery of the valve head 20 is provided with a thread. By inserting the port of the filter bottle 10 into the valve head 20 and screwing the two together, the fixation between the two is achieved.

[0090] Please refer to Figure 2 , Figure 4 and Figure 5 The valve head 20 includes a metal shell 21 and a plastic lining 22 connected to each other, and the water inlet 201 and the water outlet 202 are both formed on the plastic lining 22. In this way, the water flowing through the valve head 20 directly contacts the plastic lining 22 instead of the metal shell 21, which can avoid the problem of water being contaminated by metal elements precipitated from the metal 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 or a plastic part.

[0091] The material of the metal shell portion 21 and the plastic lining portion 22 is 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).

[0092] Specifically, the metal shell 21 and the plastic lining 22 are integrally formed by insert injection molding, and the plastic inner insert is formed with internal threads to cooperate with the external thread section of the filter bottle 10. Of course, in other embodiments, the metal shell 21 may be provided with an internal threaded pipe section protruding from the plastic lining 22, and the metal shell 21 may be screwed with the filter bottle 10 through the internal threaded pipe section.

[0093] In one embodiment, please refer to Figures 3 to 5 The valve head 20 and the filter bottle 10 are sealed by a first sealing ring 1001 and a second sealing ring 1002, and the first sealing ring 1001 and the second sealing ring 1002 are respectively located on both sides of the axial direction of the threaded connection between the valve head 20 and the filter bottle 10. In this way, a double seal can be formed at the connection between the valve head 20 and the filter bottle 10, thereby preventing the water inside the pre-filter from leaking out through the connection between the valve head 20 and the filter bottle 10, so as to ensure the working performance of the pre-filter. Of course, in other embodiments, the sealing connection between the two can also be achieved by filling waterproof glue.

[0094] Furthermore, the first sealing ring 1001 is located on the side of the second sealing ring 1002 close to the water inlet 201. Corresponding to the first sealing ring 1001 and the second sealing ring 1002, the outer circumference of the filter bottle 10 is respectively provided with an annular groove 103 and a first step 104, and the inner circumference of the valve head 20 is respectively provided with a second step 203 and a third step 204. The first sealing ring 1001 is accommodated in the space formed by the annular groove 103 and the second step 203, and the second sealing ring 1002 is accommodated in the space formed by the first step 104 and the third step 204. In this way, the installation space of the sealing ring can be formed by the annular groove 103 structure and the step structure, and the limiting effect on the sealing ring is strong, so that the stable installation of the first sealing ring 1001 and the second sealing ring 1002 can be guaranteed. Specifically, when connecting the valve head 20 and the filter bottle 10, the first sealing ring 1001 can be firstly sleeved on the annular groove 103, and the second sealing ring 1002 can be sleeved on the first step 104, and then the filter bottle 10 can be screwed into the valve head 20. When the filter bottle 10 and the valve head 20 are screwed into place, the first sealing ring 1001 can be located in the accommodating space formed by the annular groove 103 and the second step 203, and the second sealing ring 1002 can be located in the accommodating space formed by the first step 104 and the third step 204.

[0095] Further, the first sealing ring 1001 is located on the side of the second sealing ring 1002 close to the water inlet 201, the axial interference of the first sealing ring 1001 is smaller than the axial interference of the second sealing ring 1002, and the radial interference of the first sealing ring 1001 is larger than the radial interference of the second sealing ring 1002. It can be understood that the axial interference of the first sealing ring 1001 is the difference between the axial width of the first sealing ring 1001 and the axial width of the accommodation space formed by the annular groove 103 and the third step 204, and the axial interference of the second sealing ring 1002, the radial interference of the first sealing ring 1001 and the radial interference of the second sealing ring 1002 are also referred to in the same way. In this way, the first sealing ring 1001 can reliably seal the radial gap between the annular groove 103 and the third step 204, and the second sealing ring 1002 can reliably seal the axial gap between the first step 104 and the second step 203. By taking both radial sealing and axial sealing into consideration, the sealing performance of the connection between the valve head 20 and the filter bottle 10 is guaranteed.

[0096] In one embodiment, please refer to Figure 4 and Figure 6 The pre-filter further comprises a sewage discharge assembly 80, wherein the sewage discharge port 801 is formed in the sewage discharge assembly 80, wherein the sewage discharge assembly 80 comprises a connector 810 and a sewage discharge valve, wherein a mounting port 102 is provided on a side of the filter bottle 10 away from the valve head 20, wherein the connector 810 is mounted on the mounting port 102, and the sewage discharge valve is located on the outside of the filter bottle 10. In this way, the sewage discharge valve can be indirectly mounted on the filter bottle 10 through the connector 810, so that an appropriate interval can be set between the sewage discharge valve and the filter bottle 10, which can prevent pressure leakage caused by improper operation (such as over-tightening) to a certain extent, and in some cases, it can also help reduce the damage caused by the water hammer effect. In addition, the connection between the sewage discharge valve and the filter bottle 10 is realized by using the connector 810, which can facilitate the adjustment of the position of the sewage discharge valve to adapt to different installation environment requirements, and at the same time, it also simplifies the workload during the initial installation and subsequent modification. Of course, in other embodiments, the sewage discharge valve can also be directly mounted on the filter bottle 10.

[0097] Optionally, the connector 810 is provided with a limiting convex portion 811, and the limiting convex portion 811 abuts against the end side of the installation port 102 in the filter bottle 10. Specifically, one end of the connector 810 extends into the filter bottle 10, and the outer periphery of the end is convexly provided to form a limiting convex portion 811, and the limiting convex portion 811 can be annular, or a plurality of limiting convex portions 811 are distributed along the circumference. In this way, under the restriction of the limiting convex portion 811, the connector 810 cannot be disengaged from the installation port 102, thereby ensuring the stable installation of the sewage discharge assembly 80. Of course, in other embodiments, the connector 810 can also be connected to the filter bottle 10 by bonding, screwing, welding, etc.

[0098] In one embodiment, see Figures 1 to 4 The pre-filter also includes an outer cover 110, and the outer cover 110 is sleeved outside the connection between the filter bottle 10 and the sewage discharge component 80, that is, the connection between the filter bottle 10 and the sewage discharge component 80 will be accommodated on the inner circumference of the outer cover 110, thereby avoiding the connection between the filter bottle 10 and the sewage discharge component 80 from being exposed to the outside and affecting the appearance of the pre-filter. At the same time, it can also protect the connection between the filter bottle 10 and the sewage discharge component 80 and ensure the stable installation of the sewage discharge component 80.

[0099] Further, the outer cover 110 is sleeved on the side of the filter bottle 10 away from the valve head 20, and one side of the outer cover 110 in the axial direction abuts against the outer peripheral wall of the filter bottle 10, and the other side is clamped on the outer peripheral side of the sewage discharge component 80. In this way, the installation of the outer cover 110 is very convenient. The outer cover 110 is sleeved on the filter bottle 10 from the side of the filter bottle 10 away from the valve head 20. When one side of the outer cover 110 abuts against the outer peripheral wall of the filter bottle 10, the other side will also complete the clamping connection with the sewage discharge component 80, and it is conducive to ensuring the stable installation of the outer cover 110. Of course, in other embodiments, the outer cover 110 and the valve head 20, as well as the outer cover 110 and the sewage discharge component 80, can be connected by other means. For example, the outer cover 110 and the valve head 20 can also be connected by clamping or screwing, and the outer cover 110 and the sewage discharge component 80 can be connected by fasteners or by bonding.

[0100] Furthermore, a driving knob 820 is provided on the outer peripheral side of the outer cover 110, and the sewage assembly 80 includes a sewage valve, and the sewage valve is used to control the opening and closing of the sewage outlet 801, and the driving knob 820 is drivingly connected to the sewage valve. That is, the sewage valve is set as a manual valve, and the user can control the opening and closing of the sewage valve by turning the driving knob 820, thereby controlling the opening and closing of the sewage outlet 801. Among them, when the pre-filter works in the filtering mode, the sewage valve is in a state of closing the sewage outlet 801, and when the pre-filter works in the flushing mode, the sewage valve is in a state of opening the sewage outlet 801, so that the sewage can be discharged from the sewage outlet 801 to the water filter chamber 101. Of course, in other embodiments, the pre-filter can also control the opening and closing of the sewage valve by electronic control.

[0101] In one embodiment, if Figure 4As shown, the pre-filter also includes a filter assembly 30 disposed in the water filter chamber 101. After the raw water (such as tap water or well water) flows into the water inlet 201 from the external water source, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, which plays a good protective function for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., and reduces the risk of damage to these devices due to clogging by impurities. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be configured with a stainless steel filter or a PP cotton filter to filter impurities.

[0102] In one embodiment, please refer to Figures 7 to 11 The filter assembly 30 includes a filter module 300, a water passage cavity 340 is formed inside the filter module 300, a first water passage 330 connected to the water passage cavity 340 is provided in the axial direction of the filter module 300, a second water passage 350 connected to the water passage cavity 340 is provided in the circumferential direction of the filter module 300, and the filter module 300 includes a filter element 320 provided at the second water passage 350. In the filtering mode, when the raw water entering from the water inlet 201 flows to the water outlet 202 through the filter cavity 101, it can flow through the second water passage 350, and thus can be filtered by the filter element 320.

[0103] Please also refer to Figure 4 , Figure 7 and Figure 8 The filter assembly 30 further includes a water distributor 60 fixedly mounted on the filter bottle 10. The water distributor 60 is disposed on the axial side of the filter module 300 away from the sewage outlet 801. The water distributor 60 is provided with a first water flow space 601 and a second water flow space 602 spaced apart from each other. The first water flow port 330 and the water outlet 202 are connected through the first water flow space 601, and the second water flow port 350 and the water inlet 201 are connected through the second water flow space 602. Specifically, a water inlet channel 210 and a water outlet channel 220 spaced apart from each other are formed in the valve head 20. The water inlet channel 210 is connected to the water filter chamber 101 through the water inlet 201, and the water outlet channel 220 is connected to the water filter chamber 101 through the water outlet 202.

[0104] In the filtering mode, the water inlet channel 210 and the water outlet channel 220 are both turned on, and the sewage outlet 801 is closed. The raw water entering the pre-filter from the water inlet channel 210 will flow to the water filter chamber 101 on the outer peripheral side of the filter module 300 through the water inlet 201 and the second water flow space 602 in sequence, and then flow into the water flow chamber 340 through the second water flow port 350, thereby being filtered by the filter element 320, and the impurities in the raw water are intercepted by the filter element 320. Finally, the clean water filtered in the water flow chamber 340 will flow to the water outlet 202 through the first water flow space 601, and finally flow to the water use end through the water outlet channel 220.

[0105] In the flushing mode, the water inlet channel 210 and the sewage outlet 801 are both connected, and the water outlet channel 220 is closed. The water flow entering from the water inlet channel 210 will enter the water filter chamber 101 through the water inlet 201 and the second water flow space 602 in sequence. Since the pre-filter is a positive flushing type, the flow direction of the water flow does not change for the filter module 300. However, due to the closure of the water outlet 202 channel and the opening of the sewage outlet 801, the water flow in the water filter chamber 101 enters the water flow chamber 340 through the second water flow port 350, and will not pass through the The first water outlet 330 flows toward the water outlet channel 220, and will still flow toward the water filter cavity 101 on the periphery of the filter module 300 through the second water outlet 350. Thus, the filter element 320 at the second water outlet 350 can be flushed by the water flowing in and out of the water cavity 340. After the water flow flushes the surface of the filter element 320, the sewage will be discharged through the sewage outlet 801, thereby discharging the impurities previously intercepted, which can reduce the attachment of impurities on the filter element 320, so as to ensure the filtering effect of the filter assembly 30 and improve the service life of the pre-filter.

[0106] Without loss of generality, the first water inlet 330 and the water outlet 202 are both axially opposite to the first water space 601, and the second water inlet 350 and the water inlet 201 are both axially opposite to the second water space 602. In this way, it is possible to facilitate the conduction between the first water inlet 330 and the water outlet 202, and the second water inlet 350 and the water inlet 201. Of course, in other embodiments, the first water inlet 330 and the water outlet 202, or the second water inlet 350 and the water inlet 201 can be staggered and connected through an intermediate structure.

[0107] Furthermore, the water distributor 60 is inserted into the water outlet 202 on the axial side away from the filter module 300, and the connection between the water distributor 60 and the water outlet 202 is sealed. Without loss of generality, the other axial side of the water distributor 60 is connected to the filter module 300, so that the end face of the water distributor 60 abuts against the peripheral wall of the first water outlet 330, and the first water outlet 330, the first water space 601 and the water outlet 202 are sequentially connected. The outer periphery of the water distributor 60 is provided with a sealing ring, which abuts against the inner periphery of the water outlet 202 to avoid the outer peripheral side of the water distributor 60 and the inner peripheral side of the water outlet 202 to seal and cooperate, avoid water leakage at the connection between the two, and ensure that the flow path between the water inlet channel 210 and the water outlet channel 220 must pass through the filter element 320 at the second water outlet 350, thereby ensuring the filtering effect of the pre-filter. Of course, in other embodiments, the peripheral wall of the water outlet 202 may be inserted into the first water flow space 601 , or the end surface of the water distributor 60 may abut against the peripheral wall of the water outlet 202 to achieve docking between the first water flow space 601 and the water outlet 202 .

[0108] For further information, please refer to Figure 8 , the second water-passing space 602 is arranged outside the first water-passing space 601, and the second water-passing space 602 is provided with a guide vane 603 which is inclined relative to the axial direction. In this way, when the water flows through the first water-passing space 601, it will be affected by the guide vane 603, and a vortex can be formed to enter the water filter chamber 101, so as to disturb the water flow and avoid the deposition of impurities. Especially in the flushing mode, the impurities can be better entrained in the water flow, so that the impurities can be discharged from the sewage outlet 801 with the water flow. Among them, the second water-passing space 602 is arranged outside the first water-passing space 601, and can have a part opposite to the water inlet 201, and the second water-passing space 602 will be arranged relative to the water filter chamber 101 on the outer peripheral side of the filter module 300, so as to guide the water flow to diffuse in the circumferential direction of the water filter chamber 101, so as to ensure the working efficiency of the pre-filter.

[0109] For details, please refer to Figure 8The water distributor 60 includes a first connecting ring 610 and a second connecting ring 620, wherein the second connecting ring 620 is disposed outside the first connecting ring 610, the first water flow space 601 is formed in the first connecting ring 610, a grid structure is disposed in the first connecting ring 610, and the second water flow space 602 is formed between the first connecting ring 610 and the second connecting ring 620. In this way, the first water flow space 601 can break up the water flow through the grid structure, thereby ensuring the smoothness and uniformity of the outflow of the water outlet channel 220, and the radial sides of the guide vane 603 will be connected to the first connecting ring 610 and the second connecting ring 620 respectively, thereby ensuring the structural stability of the guide vane 603 and the second water flow space 602. In addition, the water distributor 60 can be fixedly connected to the filter bottle 10 through the second connecting ring 620, and the second connecting ring 620 and the filter bottle 10 can be fixed in the circumferential direction through the cooperation of the clamping protrusion and the clamping groove. Of course, in other embodiments, the second connecting ring 620 may not be provided, and the water distributor 60 and the filter bottle 10 may be circumferentially fixed by directly cooperating the guide vane 603 with the filter bottle 10 .

[0110] In one embodiment, please refer to Figure 8 , the filter assembly 30 includes a plurality of filter modules 300. The provision of a plurality of filter modules 300 improves the modularity of the filter assembly 30, and the number of filter modules 300 can be flexibly adjusted according to the model of the pre-filter (for example, but not limited to the size of the filter bottle 10), thereby achieving the effect of adjusting the size of the filter assembly 30, thereby solving the problem of sharing the filter assembly 30 of pre-filters of different models. Since the filtration area on each filter module 300 is constant, by adjusting the number of filter modules 300, the total filtration area of ​​the filter assembly 30 can also be adjusted, so that a suitable filtration area can be set, thereby achieving the effect of improving the filtration effect. Among them, when a plurality of filter modules 300 are provided, the water distributor 60 is connected to a filter module 300 provided closer to the valve head 20.

[0111] In one embodiment, if Fig. 9 and Fig.10 As shown, the first connection structure 301 and the second connection structure 302 are respectively provided on both axial sides of the filter module 300, and the first connection structure 301 of one filter module 300 is used to be detachably connected with the second connection structure 302 of another filter module 300, so that the two filter modules 300 are fixed to each other, and at least one of the first connection structure 301 and the second connection structure 302 can be detachably connected with the water distributor 60. That is, the structure of detachable connection between the two filter modules 300 is also used for detachable connection with the water distributor 60, so that the modularization degree of the filter assembly 30 can be improved, and the assembly between the various structures of the filter assembly 30 is convenient.

[0112] Among them, it can be, for example Fig.10 As shown, one of the first connection structure 301 and the second connection structure 302 is configured as a convex, and the other is configured as a slot. The water distributor 60 is correspondingly configured with a convex or a slot. Of course, it can also be, for example Fig. 9 As shown, one of the first connection structure 301 and the second connection structure 302 is configured as a hook, and the other is configured as a hook groove, and the water distributor 60 is correspondingly configured with a hook or a hook groove.

[0113] Specifically, the filter module 300 may be provided with a latching protrusion on a side close to the water distributor 60 and a latching groove on a side away from the water distributor 60, and the water distributor 60 may be provided with a latching groove on a side close to the filter module 300. In this way, the water distributor 60 and the filter module 300 as well as two adjacent filter modules 300 may be detachably connected through the cooperation of the latching protrusion and the latching groove, and the same is true for the cooperation of the hook groove and the latching hook.

[0114] In one embodiment, the filter element 320 is at least partially inclined, so that 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 clogged, the remaining area of ​​the filter element 320 can continue to withstand a larger flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0115] Without loss of generality, see Fig.11 The filter element 320 is annular and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one side of the inner ring edge in the axial direction, that is, the inner ring edge and the outer ring edge are not at the same height in the axial direction, so that the filter element 320 maintains an inclined shape in the circumferential direction. In this way, the filtering area of ​​the filter element 320 can be further increased, so as to further increase the flow load that the filter element 320 can withstand and improve the filtering efficiency.

[0116] Furthermore, the outer side surface of the filter element 320 is set in a conical surface. The design of the conical surface is conducive to the uniform distribution and smooth flow of the fluid, reduces the eddy current and turbulence of the fluid inside the filter module 300, and reduces energy loss. Specifically, the generatrix of the conical surface can be a straight line, or the generatrix of the conical surface can also be a concave arc line that is concave toward the inside of the water cavity 340, or the generatrix of the conical surface can also be a convex arc line that protrudes out of the water cavity 340. In other embodiments, the outer side surface of the filter element 320 can also be a pyramidal surface, and the cross-section of the pyramidal surface is a polygon, so that the filtering area of ​​the filter element 320 can be increased.

[0117] In one embodiment, please refer to Figures 9 to 11 , the filter module 300 includes two support frames 310 distributed along the axial direction, the water passage cavity 340 is formed between the two support frames 310, each of the support frames 310 is provided with the filter element 320, and the inner ring edge and the outer ring edge of the two adjacent filter elements 320 are distributed in opposite directions. It can be understood that when the radial space in the water filter cavity 101 is constant, compared with the filter module 300 that maintains a tapered shape in one direction, the two filter elements 320 of the same filter module 300 are tapered in opposite directions, which can obtain a larger filtering area. In this way, the present embodiment can make full use of the space in the water filter cavity 101, and form a larger filtering area on the peripheral side of the filter module 300 to ensure that the filter assembly 30 can withstand a larger flow load and improve the filtering efficiency. At the same time, a sufficiently large water passage cavity 340 can be formed in the two support frames 310 to facilitate the flow of water. Of course, in other embodiments, a filter module 300 may also include only one support frame 310 , and the first water outlet 330 , the second water outlet 350 and the water passage cavity 340 are formed on the same support frame 310 .

[0118] In one embodiment, if Fig.11 As shown, the support frame 310 includes an oblique support portion 311, and the two ends of the oblique support portion 311 are respectively connected with a first ring portion 312 and a second ring portion 313, and the two oblique support portions 311 of the same filter module 300 are connected through the second ring portion 313, and the inner periphery of the first ring portion 312 is provided with the first water outlet 330, and the second water outlet 350 is provided at the oblique support portion 311. In this way, the structural strength of the support frame 310 can be guaranteed, and the connection strength between the two support frames 310 can be guaranteed, so as to ensure the filtering capacity of the filter assembly 30. Of course, in other embodiments, the support frame 310 can also be set to other structural forms.

[0119] Specifically, the inclined support portion 311 includes a plurality of ribs spaced apart along the circumferential direction to form a plurality of second water outlets 350 spaced apart along the circumferential direction. The filter element 320 is stacked on the inclined support portion 311. In this way, the filter element 320 can be provided with sufficient support by the inclined support portion 311. In addition, the total flow area of ​​the second water outlet 350 is relatively large, so that the filter module 300 has sufficient flow capacity.

[0120] Without loss of generality, the outer diameter of the second ring portion 313 is greater than the outer diameter of the first ring portion 312, so that each filter element 320 will be alternately tapered in the upper and lower directions, which can make fuller use of the space in the water filter cavity 101 to provide a larger filtering area, thereby further improving the filtering efficiency of the filter assembly 30. Of course, in other embodiments, the outer diameter of the first ring portion 312 may be greater than the outer diameter of the second ring portion 313, or there may be no definite size relationship between the diameters of the first ring portion 312 and the second ring portion 313.

[0121] In one embodiment, if Figures 9 to 11 As shown, each of the support skeletons 310 is provided with the second ring portion 313, and the two second ring portions 313 of the same filter module 300 are detachably connected. It can be understood that the detachable connection allows the parts to be easily separated without damaging the connector 810 itself or adjacent parts. This feature allows the filter module 300 to be operated quickly and effectively when the support skeleton 310 needs to be repaired or replaced, reducing the difficulty and cost of maintenance. Since the detachable connection is easy to operate, it can greatly save time when the filter module 300 maintains and replaces the support skeleton 310. Moreover, the detachable connection allows the fast replacement of the faulty support skeleton 310, thereby reducing the time of water outage of the water system and improving the maintenance efficiency. Secondly, compared with the non-detachable connection, the detachable connection reduces the situation of the overall scrapping of the parts due to the inability to disassemble, and reduces the waste of resources. Furthermore, the detachable connection allows the filter assembly 30 to be inspected and maintained regularly or irregularly to ensure its stability and safety, which helps to timely discover and solve potential safety hazards.

[0122] Further, in some possible connection modes, the two second ring parts 313 are clamped. It can be understood that when the second ring part 313 is made of plastic or metal, the clamping structure can be directly formed on the second ring part 313, and no additional locking accessories, such as screws, nuts, etc., are required during assembly, thereby reducing the manufacturing cost and assembly cost. Moreover, since the clamping structure is flexible in design, it can be customized according to the actual needs of the second ring part 313, reducing the waste of materials and improving the utilization rate of materials. Secondly, the clamping can achieve rapid assembly and disassembly without complex tools and equipment. This greatly improves the production efficiency and assembly efficiency, and also facilitates the maintenance and replacement of the filter module 300. Specifically, the clamping structure can be the cooperation of the hook and the hook groove, or the cooperation of the convex and the groove. Of course, in other embodiments, it can also be that the two second ring parts 313 are threadedly connected, and through the tight meshing of the threads, the connection between the two second ring parts 313 has a higher tensile and compressive strength, which can meet the use requirements under various working conditions. After assembly, the connection part is not easy to loosen, and a stable connection state can be maintained to ensure the normal operation of the filter module 300.

[0123] Optionally, in the same filter module 300, the end faces of the two second ring portions 313 abut against each other; it can be understood that in the same filter module 300, the two support skeletons 310 are connected by the two second ring portions 313, and the water passage cavity 340 is formed between the two support skeletons 310. By abutting the end faces of the two second ring portions 313, the two support skeletons 310 can be connected and the water passage cavity 340 can be sealed at the same time, which is beneficial to saving processing steps and improving production efficiency.

[0124] In one embodiment, the first ring portions 312 of two adjacent filter modules 300 are detachably connected, and the specific method of the detachable connection of the two first ring portions 312 can refer to the connection method of the two second ring portions 313, and the connection method between the water distributor 60 and the filter module 300 can also refer to the connection method between the two second ring portions 313. In this way, modular assembly between different filter modules 300 can be facilitated. Furthermore, the end faces of the first ring portions 312 of the two adjacent filter modules 300 are abutted against each other, so that the first water outlets 330 of the two adjacent filter modules 300 can be connected while the connection of the two adjacent filter modules 300 is achieved, which is conducive to saving processing steps and improving production efficiency.

[0125] In one embodiment, see Figure 4 The pre-filter further includes an outer frame 50, which is rotatably mounted outside the filter assembly 30. In this way, the outer frame 50 can be rotated to disturb the water flow in the water filter chamber 101, thereby preventing impurities from being deposited and attached to the filter assembly 30, the outer frame 50 and the side wall of the water filter chamber 101, reducing the possibility of clogging of the filter assembly 30, thereby ensuring the filtering effect of the filter assembly 30.

[0126] In one embodiment, please refer to Figure 4 , Figure 6 , Fig.14 and Fig.15 An impeller assembly 40 is also provided in the water filter chamber 101 . The impeller assembly 40 includes a mounting seat 410 and an impeller body 440 rotatably mounted on the mounting seat 410 . The mounting seat 410 is provided with a water inlet 402 and a water outlet 404 connected to the water filter chamber 101 .

[0127] During the flushing stage of the pre-filter, that is, when the drain valve is opened, water flows into the pre-filter through the water inlet 402 of the mounting seat 410, and the impeller body 440 rotates under the impact of the water flow. This rotational motion can generate a vortex effect, so that the water flow forms a stronger agitation inside the filter bottle 10, thereby more effectively removing impurities and dirt attached to the surface of the filter medium. Compared with static water flow, the dynamic cleaning of the impeller assembly 40 can significantly improve the efficiency and effect of flushing. In addition, the rotational motion of the impeller body 440 can stir up the impurities and dirt inside the filter bottle 10, suspending them in the water, and discharge the filter bottle 10 with the water flow through the drain valve and the drain port 801, thereby avoiding the re-deposition of impurities on the filter medium and ensuring the thoroughness of the flushing process. In addition, the impeller assembly 40 can effectively prevent the clogging of the filter medium, keep the water flow unobstructed, and maintain the filtering efficiency of the pre-filter by enhancing the flushing effect. This is crucial to maintaining stable water pressure and clean water quality in home or commercial systems.

[0128] In addition, the impeller assembly 40 is arranged upstream of the sewage outlet 801. The impeller assembly 40 generates centrifugal force through rotation, which can cause the water flowing out of the sewage outlet 801 to produce a vortex, thereby improving the drainage effect and flushing efficiency and reducing water waste. The design of the impeller assembly 40 helps to achieve a more environmentally friendly and energy-saving filtration system.

[0129] By arranging the impeller assembly 40 in the sewage system and using the water flow power to drive the impeller body 440 to rotate, not only can the flushing force and stirring effect of the water flow be enhanced, but also the sewage discharge efficiency and cleanliness can be improved. At the same time, the design of the impeller assembly 40 can be relatively simple, low cost, and no additional energy consumption is required, which helps to reduce the overall operating cost and reduce the waste of water resources.

[0130] In this embodiment, the mounting seat 410 can provide a stable mounting environment for the impeller body 440. Of course, in other embodiments, the impeller body 440 can be directly and rotatably mounted on the filter bottle 10. In this way, the impeller body 440 can also stir the water flow.

[0131] Optionally, please also refer to Figure 6 and Fig.15 The mounting seat 410 is fixedly connected to the connecting member 810, which is conducive to ensuring the stable installation of the mounting seat 410 and the connecting member 810. Specifically, the mounting seat 410 is provided with a claw 411 protruding toward the limiting protrusion 811, and the limiting protrusion 811 is provided with a slot, and the claw 411 is engaged in the slot. Among them, the claw 411 and the slot can be spaced apart in the circumferential direction, and one claw 411 is correspondingly engaged in one slot, so that the fixed connection between the mounting seat 410 and the connecting member 810 is ensured.

[0132] Specifically, the water inlet 402 is arranged on the peripheral side of the mounting seat 410, and the drain port 404 is arranged on the axial side of the mounting seat 410 close to the sewage outlet 801. In this way, when the water flows through the inner cavity of the mounting seat 410, it needs to make a turn, which can effectively prolong the residence time of the water flow inside the mounting seat 410, so as to ensure the driving effect of the water flow on the impeller body 440, thereby ensuring the stirring effect of the impeller body 440 on the water flow.

[0133] Specifically, Figure 6 As shown, the impeller body 440 includes an impeller shaft 441, a limiting groove 412 is provided in the mounting seat 410, a ball 413 is installed in the limiting groove 412, and the impeller body 440 is rotatably inserted in the limiting groove 412 and rolls against the ball 413. It can be understood that the ball 413 can rotate and roll freely in the limiting groove 412. During the rotation of the impeller body 440, rolling friction occurs between the ball 413 and the impeller shaft 441, reducing the friction force on the impeller shaft 441, thereby improving the smoothness and efficiency of the rotation of the impeller body 440, thereby ensuring the stirring effect of the impeller body 440 on the water flow. At the same time, the setting of the ball 413 also reduces the length of the protrusion of the impeller shaft 441 inserted in the limiting groove 412, improves the bending resistance of the protrusion, ensures that the impeller shaft 441 can withstand the impact force of the water flow, and thus improves the rotation stability of the impeller body 440.

[0134] Furthermore, the outer frame 50 is transmission-connected to the impeller body 440 , so that the impeller body 440 can rotate in the same direction as the outer frame 50 during the flushing stage and provide additional rotational driving force to the outer frame 50 .

[0135] There are many structural forms for realizing the transmission connection between the outer frame 50 and the impeller body 440. For example, the impeller body 440 is coaxially connected with the outer frame 50 and fixed in the circumferential direction, that is, the rotation axis of the impeller body 440 and the outer frame 50 is kept fixed in the circumferential direction. Fig.13 and Fig.14, one end of the impeller shaft 441 is provided with a flat position 442, and the outer frame 50 is correspondingly provided with a snap-in groove 501, and the flat position 442 is adapted to snap-in in the snap-in groove 501. Among them, the snap-in groove 501 is set corresponding to the shape of the flat position 442 to ensure the synchronization of the outer frame 50 and the impeller body 440 in the circumferential rotation. The flat position 442 is formed at one end of the impeller shaft 441 close to the outer frame 50, and the end of the impeller shaft 441 away from the outer frame 50 is rotatably connected to the mounting seat 410. In this way, the rotation of the outer frame 50 and the rotation of the impeller body 440 can promote each other to ensure the turbulence effect of the outer frame 50 and the impeller body 440, thereby avoiding the deposition of impurities. Of course, in other embodiments, the exoskeleton 50 may have a plurality of first protrusions distributed along the circumference on one side of the mounting seat 410, and the impeller shaft 441 may have a plurality of second protrusions provided at one end close to the exoskeleton 50, and the plurality of second protrusions may be distributed circumferentially along the impeller shaft 441, and a first protrusion may be clamped between two adjacent second protrusions, thereby achieving circumferential fixation of the exoskeleton 50 and the impeller body 440.

[0136] In one embodiment, see Fig.12 , Fig.13 and Fig.16 The outer frame 50 is also provided with a cleaning structure 90, and the cleaning structure 90 can be arranged in multiple groups in the circumferential direction to clean at least one of the inner peripheral wall of the filter bottle 10 and the outer peripheral side of the filter module 300. In the flushing mode, with the rotation of the outer frame 50, the cleaning structure 90 can sweep away the impurities on the relevant structure through the cleaning effect, so that the impurities are separated and can be discharged with the water flow, thereby avoiding serious blockage on the filter assembly 30, ensuring the filtering effect of the filter assembly 30, and improving the service life of the pre-filter.

[0137] In one embodiment, see Figures 16 to 23 The cleaning structure 90 includes an inner cleaning brush 910 protruding from the inner circumference of the outer frame 50, and the inner cleaning brush 910 includes a cleaning portion 911, and the cleaning portion 911 extends in the axial direction of the outer frame 50. The cleaning portion 911 and the filter element 320 are correspondingly arranged so as to clean the filter element 320 through the cleaning portion 911. Since the filter element 320 of the filter assembly 30 has a certain extension in the radial direction of the outer frame 50, the side portion of the cleaning portion 911 distributed in the axial direction of the outer frame 50 can be arranged opposite to the filter element 320, and the filter element 320 can be scraped and washed by the side portion, so that the filter element 320 can be covered more comprehensively, thereby increasing the cleaning area of ​​the filter element 320 by the cleaning portion 911, and avoiding dead angles to a large extent. As a result, the cleaning effect of the pre-filter on the filter assembly 30 can be improved, thereby increasing the service life of the pre-filter.

[0138] In one embodiment, if Figures 16 to 18As shown, the inner cleaning brush 910 is provided with a cleaning portion 911 on the side portion distributed in the axial direction of the outer frame 50. It can be understood that when the filter element 320 has a portion extending in the radial direction, the cleaning portion 911 can be arranged opposite to the filter element 320, so as to better clean the filter element 320, reduce sanitary dead corners, and increase the cleaning area of ​​the filter element 320 by the inner cleaning brush 910. In addition, a plurality of cleaning portions 911 should be provided corresponding to the filter element 320 to meet the requirement of covering cleaning of the filter assembly 30.

[0139] Furthermore, if Fig.17 and Fig.18 As shown, the cleaning portion 911 is inclined toward one side of the filter element 320 corresponding to the filter element 320. Specifically, the inner cleaning brush 910 also includes a base portion 912 protruding from the inner peripheral side of the outer frame 50, and the cleaning portion 911 is arranged on the side of the base portion 912 facing one end of the filter assembly 30. Specifically, the base portion 912 is protruding from the inner peripheral side of the outer frame 50, that is, the base portion 912 extends toward the inner side of the outer frame 50, wherein the base portion 912 can extend along the radial direction of the outer frame 50, and the protruding direction of the base portion 912 can be parallel to the radial direction of the outer frame 50, or can be at a certain angle to the radial direction of the outer frame 50. The cleaning portion 911 is arranged on the side of the base portion 912 facing one end of the filter assembly 30, that is, the cleaning portion 911 is only arranged on the axial side of the base portion 912, thereby reducing unnecessary structural redundancy, and also helping to reduce the structural size of the inner cleaning brush 910, thereby facilitating the installation of the inner cleaning brush 910. The cleaning portion 911 is inclined correspondingly to the filter element 320 , that is, the cleaning portion 911 is gradually expanded in a direction away from the filter assembly 30 , so that the cleaning portion 911 can better clean the annular cone-shaped filter element 320 .

[0140] See also Fig.17 On the left side, optionally, the cleaning portion 911 includes a plurality of brush strips spaced apart in the radial direction of the outer skeleton 50 . Specifically, the plurality of brush strips are arranged along a first direction to form a cleaning portion 911 , thereby facilitating adjustment of the width of the cleaning portion 911 .

[0141] See also Fig.17 On the right side, optionally, the cleaning portion 911 is configured as a brush piece protruding along the axial direction of the outer skeleton 50 and extending along the radial direction of the outer skeleton 50, so as to facilitate the processing of the cleaning portion 911 and the base portion 912.

[0142] Further, see Fig.16 An external cleaning brush 920 is protruding from the outer side of the outer frame 50. The external cleaning brush 920 faces the inner wall of the filter bottle 10. With the rotation of the external frame 50, the external cleaning brush 920 can clean the inner wall of the filter bottle 10, reduce the impurities attached to the inner wall of the filter bottle 10, and reduce the possibility of bacteria growing in the pre-filter, thereby ensuring the service life of the pre-filter.

[0143] In the prior art, in order to clean the inner surface of the water filter chamber 101, the outer cleaning brush 920 is usually pressed against the inner surface of the water filter chamber 101, and the outer frame 50 rotates in the water filter chamber 101, so that the outer cleaning brush 920 scrapes off the impurities on the surface of the water filter chamber 101. However, in this cleaning method, the friction between the outer cleaning brush 920 and the inner wall of the water filter chamber 101 is relatively large, which may affect the normal rotation of the outer frame 50 or cause damage to the outer cleaning brush 920, thereby affecting the service life of the pre-filter.

[0144] Therefore, in this embodiment, the clearance between the outer cleaning brush 920 and the inner wall of the water filter chamber 101 is matched, thereby reducing the friction between the outer cleaning brush 920 and the inner wall of the water filter chamber 101, and because the outer frame 50 will inevitably produce a certain degree of vibration and swing when rotating in the water filter chamber 101, the inner wall of the water filter chamber 101 is cleaned by the vibration and swing of the outer frame 50 to achieve a better cleaning effect. Among them, the clearance between the outer cleaning brush 920 and the inner wall of the water filter chamber 101 is 0 to 0.3 mm, that is, it is preferably within the range of greater than or equal to 0 mm and less than or equal to 0.3 mm.

[0145] Specifically, the end of the outer cleaning brush 920 away from the outer skeleton 50 is set to be pointed, that is, the thickness of the end of the outer cleaning brush 920 away from the outer skeleton 50 is set to be thinner, thereby improving the effect of the outer cleaning brush 920 on the inner wall of the water filter chamber 101, and improving the cleaning effect of the outer cleaning brush 920 on the inner wall of the water filter chamber 101.

[0146] Further, see Fig.16 , a mounting portion 930 is also installed on the outer frame 50, the inner cleaning brush 910 is arranged on the side of the mounting portion 930 facing the inner side of the outer frame 50, and the outer cleaning brush 920 is arranged on the side of the mounting portion 930 facing the outer side of the outer frame 50. Specifically, the mounting portion 930 is used to assemble with the outer frame 50, and the outer cleaning brush 920 and the inner cleaning brush 910 are both arranged on the mounting portion 930, so that the installation of the outer cleaning brush 920 and the inner cleaning brush 910 is realized by installing the mounting portion 930, thereby facilitating the installation of the inner cleaning brush 910 and the outer cleaning brush 920. In other embodiments, the inner cleaning brush 910 and the outer cleaning brush 920 can also be installed on the outer frame 50 through their respective mounting structures, that is, the inner cleaning brush 910 and the outer cleaning brush 920 are each independently arranged, and there is no connection relationship between the two.

[0147] In the embodiment of the present invention, the mounting portion 930, the outer cleaning brush 920 and the inner cleaning brush 910 are integrally formed. Specifically, the mounting portion 930, the outer cleaning brush 920 and the inner cleaning brush 910 are integrally formed, so that the installation of the inner cleaning brush 910 and the outer cleaning brush 920 is convenient and the installation of the inner cleaning brush 910 and the outer cleaning brush 920 is stable.

[0148] In other embodiments, the mounting portion 930 and the outer cleaning brush 920 can be integrally formed, so as to facilitate the installation of the plurality of outer cleaning brushes 920 and improve the installation stability of the outer cleaning brush 920. In other embodiments, the outer cleaning brush 920 and the mounting portion 930 can also be separately formed, such as the outer cleaning brush 920 is bonded or clamped or fixed to the mounting portion 930 by fasteners. The mounting portion 930 and the inner cleaning brush 910 can be integrally formed, so as to facilitate the installation of the plurality of inner cleaning brushes 910 and improve the installation stability of the inner cleaning brush 910. In other embodiments, the inner cleaning brush 910 and the mounting portion 930 can also be separately formed, such as the inner cleaning brush 910 is bonded or clamped or fixed to the mounting portion 930 by fasteners. The mounting portion 930 can be separately formed from the exoskeleton 50, such as the mounting portion 930 is bonded or clamped or fixed to the exoskeleton 50 by fasteners, so as to facilitate the overall processing of the exoskeleton 50 and facilitate the selection of materials for the exoskeleton 50 and the mounting portion 930. In other embodiments, the mounting portion 930 may also be integrally formed with the outer frame 50 .

[0149] To facilitate the disassembly of the inner cleaning brush 910 and the outer cleaning brush 920, in an embodiment of the present invention, the mounting portion 930 can be detachably mounted on the outer frame 50, thereby facilitating the disassembly of the inner cleaning brush 910 and the outer cleaning brush 920. When at least one of the inner cleaning brush 910 and the outer cleaning brush 920 fails, it can be replaced in time without replacing the entire outer frame 50, thereby facilitating the inspection and maintenance of the pre-filter.

[0150] In one embodiment, the cleaning portion 911 extends obliquely relative to the axial direction of the outer frame 50. In this way, the deformation capacity of the cleaning portion 911 in the axial direction of the outer frame 50 can be improved. It can be understood that the cleaning portion 911 and the filter element 320 will abut and fit in the axial direction of the outer frame 50, and the cleaning portion 911 is easy to deform in the abutment and fitting direction of the two, which is conducive to reducing the pressure between the cleaning portion 911 and the filter element 320, thereby reducing the friction between the cleaning portion 911 and the filter element 320 when the outer frame 50 and the filter assembly 30 rotate relative to each other, so that the outer frame 50 can smoothly rotate relative to the filter assembly 30 to ensure that the cleaning portion 911 fully cleans the filter element 320 in the circumferential direction.

[0151] Furthermore, the cleaning portion 911 extends obliquely along the circumference of the exoskeleton 50 relative to the axial direction of the exoskeleton 50. It can be understood that the direction in which the cleaning portion 911 is inclined is a direction that is conducive to its deformation. In this embodiment, the exoskeleton 50 rotates along the circumference, and the cleaning portion 911 is easy to deform in the circumference of the exoskeleton 50, which is conducive to further reducing the friction between the cleaning portion 911 and the filter element 320 to ensure the smooth rotation of the exoskeleton 50. In addition, the cleaning portion 911 can more easily cover more area on the filter element 320, which is conducive to improving the cleaning effect of the cleaning portion 911 on the filter element 320.

[0152] Furthermore, there are a plurality of cleaning parts 911 distributed in the axial direction of the outer frame 50, and one cleaning part 911 is provided corresponding to one filter element 320. In this way, one cleaning part 911 can be used to clean one filter element 320 accordingly, so as to ensure the cleaning effect of the filter assembly 30.

[0153] Optionally, see Fig. 20 , there are multiple cleaning structures 90 distributed in the circumferential direction of the outer skeleton 50. Among them, it can be that each cleaning structure 90 is provided with the same number of cleaning parts 911 corresponding to the number of filter elements 320, so that each filter element 320 will be cleaned by the cleaning parts 911 of multiple cleaning structures 90 distributed in the circumferential direction, which is beneficial to ensure the cleaning effect of the filter assembly 30. Of course, it can also be that a cleaning part 911 is only provided for part of the filter elements 320 on a cleaning structure 90, and the cleaning parts 911 are staggered on multiple cleaning structures 90 distributed in the circumferential direction, so that each filter element 320 is provided with at least one cleaning part 911. In this way, under the premise of ensuring the coverage of the cleaning structure 90 on the filter element 320, the friction between the cleaning part 911 and the filter element 320 can also be dispersed in the circumferential direction, which is beneficial to ensure the stability and smoothness of the rotation of the outer skeleton 50.

[0154] The plurality of cleaning parts 911 are arranged to be tilted relative to the axial direction of the exoskeleton 50 along the same circumferential direction of the exoskeleton 50. In this way, the tilting direction of the cleaning parts 911 can be conveniently set according to the need of the rotation direction of the exoskeleton 50 to reduce the friction between the cleaning parts 911 and the cleaning surface, thereby ensuring the smooth rotation of the exoskeleton 50. For example, when the exoskeleton 50 needs to rotate clockwise, each cleaning part 911 is tilted in the counterclockwise direction.

[0155] For further information, see Fig.21In the schematic diagram on the right side, the side of the cleaning part 911 distributed in the axial direction of the outer frame 50 is inclined. The side of the cleaning part 911 used to clean the filter element 320 is set to an inclined shape corresponding to the filter element 320, which can improve the fit between the cleaning part 911 and the filter element 320, and is conducive to improving the cleaning force of the cleaning part 911 on the filter element 320, thereby ensuring the cleaning effect of the filter assembly 30 and ensuring the life of the pre-filter.

[0156] For further information, see Fig.23 For the cleaning parts 911 located at the same axial position, the angle α between two adjacent cleaning parts 911 is an acute angle. In this way, the spatial arrangement of the cleaning parts 911 can be facilitated, and at the same time, it is beneficial to ensure that the cleaning parts 911 cover the filter element 320 in the axial direction.

[0157] For further information, see Figure 21 to Figure 23 The inner cleaning brush 910 further includes a base portion 912, which is protruding from the inner circumference of the outer frame 50, and the cleaning portion 911 is connected to the outer circumference of the base portion 912. In this way, the base portion 912 can provide support for the cleaning portion 911 to improve the structural strength of the inner cleaning brush 910, and the cleaning portion 911 can be connected to the outer frame 50 through the base portion 912, without extending to the inner circumference of the outer frame 50 to connect with the outer frame 50. The cleaning portion 911 only needs to maintain the axial coverage of the filter element 320. Of course, in other embodiments, the cleaning portion 911 can also be directly connected to the outer frame 50.

[0158] Furthermore, one base portion 912 is provided with two cleaning portions 911 extending in opposite directions in the axial direction of the outer frame 50. In this way, the two cleaning portions 911 provided on one base portion 912 can clean two filter elements 320, which is helpful to simplify the structure of the cleaning structure 90. Of course, in other embodiments, the base portion 912 and the cleaning portion 911 may be provided in a one-to-one correspondence.

[0159] Furthermore, a base portion 912 is correspondingly provided at the connection of the two filter modules 300, and two cleaning portions 911 on the base portion 912 extend in opposite directions relative to the base portion 912 in the axial direction of the outer frame 50. In this way, the connection of the two adjacent filter modules 300 can form a space for accommodating the internal cleaning brush 910, and the two cleaning portions 911 on the base portion 912 can be used to clean the filter elements 320 on the adjacent sides of the two filter modules 300, which is conducive to improving the compactness of the internal structure of the pre-filter, thereby improving the utilization rate of the internal space of the water filter chamber 101, and is conducive to realizing the miniaturization design of the pre-filter.

[0160] Furthermore, the internal cleaning brush 910 has two types of structures. For the internal cleaning brush 910 disposed at the connection between the two filter modules 300, two cleaning portions 911 extending in opposite directions in the axial direction of the outer frame 50 are disposed on a base portion 912. For the internal cleaning brush 910 disposed at the end of the filter assembly 30, only one cleaning portion 911 is required to be disposed on the base portion 912. The structure of the internal cleaning brush 910 can be the structure of the aforementioned internal cleaning brush 910 divided in half. Without loss of generality, in the former type of internal cleaning brush 910, the base portion 912 can be cylindrical, and the two cleaning portions 911 are distributed on both sides of the axis of the cylinder. In the latter type of internal cleaning brush 910, the base portion 912 is configured as a half-cylinder, and the cleaning portion 911 is connected to the circumference of the cylinder.

[0161] For further information, see Fig.21 and Fig.23 , the cleaning portion 911 is configured as a sheet structure. In this way, the cleaning portion 911 is relatively thin, and the cleaning portion 911 can have an appropriate thickness d, and can have good deformation ability. When the cleaning portion 911 abuts against the filter element 320, it will not generate too much resistance to the filter element 320, thereby avoiding the situation where the filter element 320 is stuck and the outer skeleton 50 cannot rotate. It can be understood that the thickness of the cleaning portion 911 needs to be able to meet the requirements for deformation ability, and also ensure that the cleaning portion 911 has sufficient structural strength, and ensure the connection stability between the cleaning portion 911 and the base portion 912 or other related structures.

[0162] Furthermore, the cleaning portion 911 and the filter element 320 are in interference fit. In this way, the cleaning portion 911 can clean the impurities of the filter element 320 more deeply, thereby enhancing the cleaning force of the cleaning structure 90 on the filter assembly 30, so as to ensure the filtering effect of the filter assembly 30 and increase the service life of the pre-filter. Among them, the abutment degree between the cleaning portion 911 and the filter element 320 needs to be within an appropriate range. While ensuring the cleaning force of the cleaning portion 911 on the filter element 320, the friction between the cleaning portion 911 and the filter element 320 will not be too large, so as to avoid excessive interference with the rotation of the external skeleton 50, and also reduce the wear on the cleaning portion 911.

[0163] Furthermore, the cleaning structure 90 is detachably mounted on the outer frame 50. In this way, when the cleaning portion 911 is excessively worn and cannot effectively clean the filter assembly 30, the original cleaning structure 90 can be conveniently removed and replaced with a new cleaning structure 90. Of course, in other embodiments, only the cleaning portion 911 can be removed and replaced to save the maintenance cost of the pre-filter.

[0164] For further information, see Fig. 20 and Fig. 22, the cleaning structure 90 also includes a mounting portion 930, on which a plurality of internal cleaning brushes 910 are disposed, and a mounting groove is correspondingly disposed on the exoskeleton 50, and the mounting portion 930 is snapped into the mounting groove. It can be understood that the mounting portion 930 extends along the axial direction of the exoskeleton 50, and the plurality of internal cleaning brushes 910 are also distributed in the axial direction of the exoskeleton 50. In this way, a plurality of internal cleaning brushes 910 can be installed on the exoskeleton 50 through a mounting portion 930, and the mounting portion 930 and the exoskeleton 50 can be disassembled and assembled to replace the plurality of internal cleaning brushes 910, thereby improving the convenience of maintenance of the cleaning structure 90. Of course, in other embodiments, the internal cleaning brush 910 may also be directly connected to the exoskeleton 50.

[0165] For further information, see Fig.24 , some corners of the mounting portion 930 are set to a chamfered shape, and the corners corresponding to the mounting groove are configured to have the same chamfered shape. Among the corners of the mounting portion 930, only some are set to a chamfered shape, and the corners of the mounting groove are set to a corresponding chamfered shape. In this way, it is easy to match the corners corresponding to the mounting portion 930 and the mounting groove, and it plays a fool-proof role in the assembly process of the cleaning structure 90 and the outer frame 50, and can prevent the cleaning structure 90 from being installed upside down. Of course, in other embodiments, fool-proofing can also be performed in other ways, for example, an arrow indicating a direction is set on the outer side of the mounting portion 930.

[0166] In the embodiment of the present invention, the mounting portion 930 and the inner cleaning brush 910 are integrally formed. Specifically, the mounting portion 930 and the inner cleaning brush 910 are integrally formed, so that the inner cleaning brush 910 is conveniently installed and the installation of the inner cleaning brush 910 is stable.

[0167] It should be noted that the multiple indicated in this solution, unless otherwise specified, should be understood as greater than or equal to two.

[0168] The present invention also proposes a water system, which includes a pre-filter. The specific structure of the pre-filter refers to the above embodiment. Since the water system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the water system at least includes related components from the pre-filter to the water end. For example, the water system can include household appliances such as water heaters, dishwashers, and water dispensers, and can also include accessories such as water pipes for domestic water in the whole house.

[0169] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: A valve head and a filter bottle are screwed together, the filter bottle forms 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 on a side away from the valve head; as well as A filter assembly is arranged in the water filter cavity, and the filter assembly includes a plurality of filter modules connected along the axial direction, a water passage cavity is formed inside the filter module, a first water passage port connected to the water passage cavity is provided in the axial direction of the filter module, a second water passage port connected to the water passage cavity is provided in the circumferential direction of the filter module, a filter element is provided in the second water passage port, the filter element is arranged in an annular shape, and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one axial side of the inner ring edge.

2. The pre-filter according to claim 1, characterized in that: The filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, each support frame is provided with the second water passage, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

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

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

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

6. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an outer frame, and the outer frame is rotatably sleeved outside the filter assembly.

7. The pre-filter according to claim 6, characterized in that: The pre-filter also includes an impeller body coaxially connected to the outer frame, the impeller body is arranged in the water filter cavity, and the impeller body is relatively fixed to the outer frame in the circumferential direction.

8. The pre-filter according to claim 7, characterized in that: The pre-filter also includes a mounting seat fixedly mounted on the water filter chamber, the mounting seat is provided with a water inlet and a water outlet communicating with the water filter chamber, and the impeller body is rotatably mounted in the mounting seat.

9. The pre-filter according to claim 8, characterized in that: The water inlet is arranged on the peripheral side of the mounting seat, and the drain outlet is arranged on the axial side of the mounting seat close to the sewage outlet; And / or, the impeller body includes an impeller shaft, a limiting groove is provided in the mounting seat, a ball is installed in the limiting groove, and the impeller body is rotatably inserted in the limiting groove and rolls against the ball.

10. The pre-filter according to claim 7, characterized in that: The impeller body comprises an impeller shaft, one end of which is provided with a flat portion, and the outer frame is correspondingly provided with a clamping groove, and the flat portion is adapted to be clamped in the clamping groove.

11. The pre-filter according to claim 6, characterized in that: The outer frame is provided with a cleaning structure, and the cleaning structure is used to clean at least one of the filter element and the filter bottle.

12. The pre-filter according to claim 11, characterized in that: The cleaning structure includes an inner cleaning brush protruding from the inner circumference of the outer frame, the inner cleaning brush includes a cleaning portion extending in the axial direction of the outer frame, the cleaning portion is arranged corresponding to the filter element, and the cleaning portion is used to clean the filter element.

13. The pre-filter according to claim 12, characterized in that: The cleaning part is provided on the side of the inner cleaning brush distributed in the axial direction of the outer frame.

14. The pre-filter according to claim 12, characterized in that: The cleaning portion is inclined toward one side of the filter element corresponding to the filter element.

15. The pre-filter according to claim 12, characterized in that: The cleaning part includes a plurality of brush strips spaced apart in a radial direction of the outer frame; or, the cleaning part is configured as a brush sheet protruding in an axial direction of the outer frame and extending in a radial direction of the outer frame.

16. The pre-filter according to claim 11, characterized in that: The cleaning structure comprises an outer cleaning brush arranged on the outer peripheral side of the outer frame, and a gap between the outer cleaning brush and the inner wall of the filter bottle is 0 to 0.3 mm.

17. The pre-filter according to claim 12, characterized in that: The cleaning portion extends along the circumferential direction of the outer frame and is inclined relative to the axial direction of the outer frame.

18. The pre-filter according to claim 12, characterized in that: The cleaning parts are distributed in a plurality in the axial direction of the outer frame, one cleaning part is arranged corresponding to one filter element, and two adjacent cleaning parts are arranged at an acute angle; And / or, the inner cleaning brush further comprises a base portion, the base portion is protrudingly arranged on the inner circumference of the outer frame, and the cleaning portion is connected to the outer circumference of the base portion.

19. The pre-filter according to claim 1, characterized in that: The pre-filter also includes a sewage discharge assembly, the sewage discharge port is formed in the sewage discharge assembly, the sewage discharge assembly includes a connecting piece and a sewage discharge valve, a mounting port is provided on the side of the filter bottle away from the valve head, the connecting piece is installed in the mounting port, and the sewage discharge valve is located on the outside of the filter bottle.

20. The pre-filter according to claim 19, characterized in that The pre-filter also includes an impeller assembly, which includes a mounting seat fixedly installed in the water filter chamber and an impeller body rotatably installed in the mounting seat, and the connecting piece is clamped on the mounting seat.

21. The pre-filter according to claim 20, characterized in that: The connecting piece is provided with a limiting protrusion, and the limiting protrusion abuts against the end side of the mounting port in the filter bottle. The mounting seat is provided with a claw protruding toward the limiting protrusion, and the limiting protrusion is provided with a slot, and the claw is engaged in the slot.

22. The pre-filter according to claim 1, characterized in that: The pre-filter also includes a sewage discharge component and an outer cover. The sewage discharge component is installed on the side of the filter bottle away from the valve head. The outer cover is sleeved on the side of the filter bottle away from the valve head, and one side of the outer cover in the axial direction abuts against the outer peripheral wall of the filter bottle, and the other side is clamped on the outer peripheral side of the sewage discharge component.

23. The pre-filter according to claim 20, characterized in that: A driving knob is provided on the outer peripheral side of the outer cover, and the sewage discharge component includes a sewage discharge valve, and the sewage discharge valve is used to control the opening and closing of the sewage discharge port, and the driving knob is drivingly connected to the sewage discharge valve.

24. The pre-filter according to claim 1, characterized in that: The valve head and the filter bottle are sealed by a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are respectively located on both axial sides of the threaded connection between the valve head and the filter bottle.

25. The pre-filter according to claim 24, characterized in that: The filter bottle is provided with an external thread section, and is threadedly connected to the valve head through the external thread section, the first sealing ring is located on a side of the external thread section close to the water inlet, and the second sealing ring is located on a side of the external thread section away from the water inlet, the axial interference amount of the first sealing ring is smaller than the axial interference amount of the second sealing ring, and the radial interference amount of the first sealing ring is larger than the radial interference amount of the second sealing ring.

26. The pre-filter according to claim 1, characterized in that: A water inlet channel and a water outlet channel are formed in the valve head, the water inlet channel is connected to the water filter chamber through the water inlet, and the water outlet channel is connected to the water filter chamber through the water outlet; The filter assembly also includes a water distributor fixedly mounted on the filter bottle, one axial side of the water distributor is plugged into the water outlet, and the other side is connected to the filter module; The water distributor is provided with a first water flow space and a second water flow space arranged outside the first water flow space. The first water flow port and the water outlet are connected through the first water flow space, and the second water flow port and the water inlet are connected through the second water flow space. The second water flow space is provided with guide blades inclined relative to the axial direction.

27. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 26.

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