Pre-filter and water system

Abstract

The utility model discloses a prefilter and water consuming system relates to filter technical field, wherein prefilter includes valve head, filter flask, filter subassembly, drive piece and movable piece, filter flask forms the water filter cavity, valve head is equipped with the water inlet and water outlet that is communicated with water filter cavity, filter flask far away from the valve head side is equipped with the drain outlet, and filter flask far away from the valve head side is equipped with the filter subassembly. The driving part is in driving connection with the movable part and is exposed out of the outer side of the pre-filter, the movable part is movably arranged in the water filtering cavity so that the pre-filter can be switched between a filtering mode and a flushing mode, the water inlet and the water outlet are formed in one side of the movable part, and the drain outlet is formed in the other side of the movable part. The spaces on the two opposite sides of the movable part are separated in the filtering mode and communicated in the flushing mode. According to the technical scheme provided by the utility model, the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

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

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

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

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

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

[0007] a driving member and a movable member, wherein the driving member is drivingly connected to the movable member and is exposed on the outside of the pre-filter, the movable member is movably disposed in the water filter chamber to enable the pre-filter to switch between a filtering mode and a flushing mode, the water inlet and the water outlet are disposed on one side of the movable member, and the sewage outlet is disposed on the other side of the movable member;

[0008] The spaces on opposite sides of the movable member are isolated in the filtering mode and connected in the flushing mode.

[0009] In one embodiment, the pre-filter further includes a sewage discharge assembly, which is installed on a side of the filter bottle away from the valve head. The sewage discharge assembly forms a sewage discharge channel, and the sewage discharge port is located on a side of the sewage discharge channel away from the valve head.

[0010] In one embodiment, the movable member includes a blocking portion, which blocks the drain channel in the filtering mode and opens the drain channel in the flushing mode.

[0011] In one embodiment, the drainage channel comprises a first channel and a second channel that are coaxially connected, and the first channel is located on a side close to the water filter chamber;

[0012] The movable member further includes a relief portion connected to a side of the blocking portion close to the valve head;

[0013] In the filtering mode, the blocking portion blocks the first channel. In the flushing mode, the blocking portion is in the second channel and is gapped with the second channel. The avoidance portion passes through the first channel and is gapped with the first channel.

[0014] In one embodiment, a sealing ring is sleeved on the outer periphery of the blocking portion. In the filtering mode, the blocking portion is located in the first channel, and the outer periphery of the sealing ring abuts against the inner peripheral wall of the first channel.

[0015] In one embodiment, the driving member includes a driving screw, which is rotatably connected to the valve head and fixed in the axial direction, and the movable member is connected to the driving screw via a threaded structure.

[0016] In one embodiment, the screw connection structure is configured as a mounting bracket, the pre-filter further comprises a reversing member fixedly connected to the movable member, the mounting bracket is fixed to the reversing member, and the drive screw is screwed to the mounting bracket.

[0017] In one embodiment, the mounting bracket is detachably connected to the reversing member.

[0018] In one embodiment, the mounting bracket includes an inner ring portion and an outer ring portion that are connected to each other, the driving screw is screwed to the inner ring portion, and the outer ring portion is snap-connected to the reversing member.

[0019] In one embodiment, the outer ring portion is connected to a plurality of connecting arms extending in the axial direction, and the plurality of connecting arms are distributed at intervals in the circumferential direction. The connecting arms are provided with a snap-fitting protrusion, and the reversing member is correspondingly provided with a buckle groove, and the snap-fitting protrusion is buckled with the buckle groove. The inner ring portion is arranged opposite to the connecting arms, and is connected to the plurality of connecting arms one by one through a plurality of connecting ribs distributed in the circumferential direction.

[0020] In one embodiment, the driving member further includes a driving knob, which is fixed to the driving screw and passes through the valve head to be exposed on the outside of the valve head.

[0021] In one embodiment, the driving knob is rotatably connected to the valve head and is fixed relative to the valve head in the axial direction.

[0022] In one embodiment, the valve head includes a metal outer shell and a plastic lining portion, the metal outer shell and the filter bottle are connected by fasteners, and the plastic lining portion is sealingly fitted to the filter bottle.

[0023] In one embodiment, the pre-filter also includes a reversing member fixedly connected to the movable member, a water-isolating ring is provided between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water-isolating ring, and the water outlet is connected to the inner peripheral side of the water-isolating ring, the reversing member is axially movably inserted into the water-isolating ring and the filter assembly, the reversing member includes a connecting portion and a blocking portion, the flushing flow path between the water inlet and the reversing member is connected through the connecting portion and cut off through the blocking portion.

[0024] In one embodiment, the filter assembly includes a water distributor and a filter module connected along the axial direction, a water flow cavity is formed inside the filter module, and the filter module also forms a first water flow port and a second water flow port connected to the water flow cavity, the filter module includes a filter element, and the filter element is arranged at the second water flow port, the water distributor has a first water flow space corresponding to the first water flow port and a second water flow space corresponding to the second water flow port, a guide blade is provided in the second water flow space, and the reversing element extends into the water flow cavity through the first water flow space.

[0025] In one embodiment, the reversing member further includes a hollow pipe section, the connecting portion, the blocking portion and the hollow pipe section are distributed in sequence along the axial direction, the connecting portion is plug-fitted with the water-isolating ring, the blocking portion is plug-fitted with the water distributor, and the hollow pipe section extends into the filter module.

[0026] In one embodiment, the water distributor and the water isolation ring are axially opposed and spaced apart. In the filtering mode, the axial sides of the blocking portion are respectively connected to the water distributor and the water isolation ring and are spaced apart from the second water flow space. In the flushing mode, the connecting portion is at least partially located between the water distributor and the water isolation ring and covers the second water flow space.

[0027] In one embodiment, a connection point between the movable member and the hollow tube section is located in the water passage cavity.

[0028] In one embodiment, the movable member and the hollow tube section are threadedly connected.

[0029] The utility model also provides a water use system, comprising the aforementioned pre-filter.

[0030] In the technical solution of the present invention, a user can apply force to an externally exposed driving member, which drives the movable member to move so that the movable member is in the corresponding position corresponding to the filtering mode and the flushing mode. Specifically, in the filtering mode, the water outlet is open and the sewage outlet is closed. Raw water entering from the water inlet enters the water filter chamber, is filtered by the filter assembly, and then flows to the water outlet. At this time, the movable member is in a position to separate the space on both sides. In the flushing mode, the water outlet is closed and the sewage outlet is opened. The water flow from the water inlet can flush the filter assembly in the water filter chamber. In this mode, impurities attached to the filter assembly can be cleaned, and then the sewage can flow out through the sewage outlet. At this time, the movable member is in a position to connect the space on both sides, so that the water inlet and sewage outlet are connected. Specifically, when the pre-filter is in the filtering mode, the water inlet, water outlet, and filter assembly can be relatively concentrated on the same side of the movable member, and the raw water will not flow over the movable member in the direction of the sewage outlet, so that the raw water can be filtered more efficiently by the filter assembly.

[0031] In this utility model, the pre-filter has a flushing mode that can regularly clean impurities adhering to the filter assembly, thereby ensuring the filtration effect of the filter assembly and extending the service life of the pre-filter. In addition, the movable part switches between different positions, effectively ensuring the working performance of the pre-filter in different working modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the external structure of an embodiment of a pre-filter provided by the utility model;

[0034] Figure 2 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0035] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0036] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0037] Figure 5 for Figure 2 A partial enlarged view of point C in the middle;

[0038] Figure 6 for Figure 3 Schematic diagram of the corresponding local structure in flushing mode;

[0039] Figure 7 for Figure 4 Schematic diagram of the corresponding local structure in flushing mode;

[0040] Figure 8 This is a structural diagram of a partial structure of an embodiment of a pre-filter provided by the present utility model;

[0041] Figure 9 This is a structural diagram of a partial structure of an embodiment of a pre-filter provided by the present utility model;

[0042] Figure 10 This is a schematic diagram of the external structure of a filter assembly of a pre-filter provided by the utility model;

[0043] Figure 11 This is a schematic diagram of the exploded structure of an embodiment of a filter module of a pre-filter provided by the present invention;

[0044] Figure 12 This is a schematic diagram of the partial structure of the filter assembly of the pre-filter provided by the utility model.

[0045] Description of Figure Numbers:

[0046] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet;

[0047] 140, sewage channel; 141, first channel; 142, second channel;

[0048] 20. Valve head; 201. Water inlet; 202. Water outlet; 203. Water isolation ring; 22. Metal shell; 23. Plastic lining;

[0049] 30. Filter assembly; 300. Filter module; 320. Filter element; 330. First water outlet; 340. Water passage cavity; 350. Second water outlet;

[0050] 60. Water distributor; 610. First water flow space; 620. Second water flow space; 621. Guide vane;

[0051] 720, reversing member; 721, connecting portion; 722, baffle portion; 7221, annular main body; 7222, baffle skirt; 723, hollow pipe section;

[0052] 730, movable part; 731, blocking part; 732, connecting part; 733, avoiding part;

[0053] 740, mounting bracket; 741, inner ring; 742, outer ring; 743, connecting arm; 744, snap-fit ​​protrusion; 745, connecting rib;

[0054] 800, driving member; 810, driving screw; 820, driving knob;

[0055] 900. Sewage discharge assembly; 1001. Fastener; 1002. Sealing ring.

[0056] 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

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0058] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0059] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] Water systems, such as whole-house water purification systems, typically feature a pre-filter to remove large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system and is a physical filtration device used to protect back-end water safety.

[0061] The utility model proposes a pre-filter, which has a filtering mode and a flushing mode. In the filtering mode, the pre-filter can filter large particulate matter before the water end. In the flushing mode, the pre-filter can clean the filter components inside it to discharge the large particulate matter previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter, thereby increasing the service life of the pre-filter.

[0062] See also Figure 1 and Figure 2 In one embodiment of the present invention, the pre-filter includes a valve head 20 and a filter bottle 10, the filter bottle 10 is formed with a water filter chamber 101, the valve head 20 is provided with a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, and the filter bottle 10 is provided with a sewage outlet 102 on the side away from the valve head 20.

[0063] The water inlet 201 is connected to the water supply end of the water supply system, and the water outlet 202 is connected to the water consumption end of the water supply system, thereby filtering the raw water flowing from the water supply end to the water consumption end. It should be noted that the water supply end can be a tap, water tower, or well water, and the water consumption end can be a faucet, shower, or drinking water outlet, which is not specifically limited in this application.

[0064] The valve head 20 and the filter bottle 10 can be connected by a threaded connection. For example, the valve head 20 may be provided with an externally threaded tube, and the mouth of the filter bottle 10 may be provided with corresponding internal threads for threading the externally threaded tube. To reduce the difficulty of pre-filter production and the requirements for assembly test results, as well as to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001.

[0065] The valve head 20 comprises a connected metal outer shell 22 and a plastic inner lining 23. Both the water inlet 201 and the water outlet 202 are formed in the plastic inner lining 23. This ensures that water flowing through the pre-filter directly contacts the plastic inner lining 23 rather than the metal outer shell 22. This prevents water contamination by metal elements precipitated from the metal outer shell 22 while also enhancing the pre-filter's aesthetics and housing strength. In other embodiments, the valve head 20 can also be constructed directly from metal.

[0066] The material of the metal shell part 22 and the plastic lining part 23 is not specifically limited in this application. For example, the material of the metal shell part 22 can be a copper alloy, such as brass, and the material of the plastic lining part 23 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0067] The pre-filter also includes a filter assembly 30 disposed within the water filter chamber 101. After raw water (e.g., tap water or well water) flows from an external water source into the water inlet 201, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria, and other particulate impurities generated in the pipeline. This provides better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to impurity blockage. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter mesh or a PP cotton filter mesh to filter impurities.

[0068] The pre-filter is usually a "T"-shaped structure. The upper "horizontal" position corresponds to the valve head 20, and the left and right ends are the water inlet 201 and the water outlet 202 respectively. The lower "vertical" main body is the filter bottle 10, and the sewage outlet 102 is located on the lower side of the filter bottle 10.

[0069] Please refer to Figures 2 to 9 The pre-filter also includes a driving member 800 and a movable member 730. The driving member 800 is driven and connected to the movable member 730 and is exposed on the outside of the pre-filter. The movable member 730 is movably arranged in the water filter chamber 101, so that the pre-filter can switch between the filtering mode and the flushing mode. The water inlet 201 and the water outlet 202 are arranged on one side of the movable member 730, and the sewage outlet 102 is arranged on the other side of the movable member 730. The spaces on the opposite sides of the movable member 730 are separated in the filtering mode and connected in the flushing mode.

[0070] In the technical solution of the present utility model, the user can apply force to the externally exposed driving member 800 to drive the movable member 730 to move, so that the movable member 730 is in positions corresponding to the filtering mode and the flushing mode.

[0071] Specifically, in the filtering mode, the water outlet 202 is opened and the sewage outlet 102 is closed. The raw water entering from the water inlet 201 enters the water filter chamber 101, is filtered by the filter component 30, and then flows to the water outlet 202. At this time, the movable part 730 is in a position to separate the space on both sides; in the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened. The water flow entering from the water inlet 201 can flush the filter component 30 in the water filter chamber 101. In this mode, impurities attached to the filter component 30 can be cleaned, and then the sewage can flow out through the sewage outlet 102. At this time, the movable part 730 is in a position to connect the space on both sides, so that the water inlet 201 and the sewage outlet 102 can be connected.

[0072] Among them, when the pre-filter is in the filtering mode, the water inlet 201, the water outlet 202 and the filter assembly 30 can be relatively concentratedly distributed on the same side of the movable part 730, and the raw water will not flow over the movable part 730 in the direction of the sewage outlet 102, so that the raw water can be filtered more efficiently through the filter assembly 30.

[0073] In the present invention, the pre-filter has a flushing mode that regularly cleans impurities adhering to the filter assembly 30, thereby ensuring the filtration efficiency of the filter assembly 30 and extending the service life of the pre-filter. Furthermore, the movable member 730 switches between different positions, effectively ensuring the performance of the pre-filter in different operating modes.

[0074] Without loss of generality, the pre-filter further includes a sewage discharge component 900, which is installed on the side of the filter bottle 10 away from the valve head 20. The sewage discharge component 900 is formed with a sewage discharge channel 140, and the sewage discharge port 102 is located on the side of the sewage discharge channel 140 away from the valve head 20. Of course, in other embodiments, the sewage discharge channel 140 and the sewage discharge port 102 can also be formed by the filter bottle 10.

[0075] Furthermore, the movable member 730 includes a blocking portion 731, which blocks the drain channel 140 in the filtering mode and opens the drain channel 140 in the flushing mode. Thus, the blocking portion 731 cooperates with the drain channel 140 to allow the movable member 730 to separate or connect the spaces on both sides when it moves to different positions. In particular, the blocking portion 731 of the movable member 730 performs a valve core-like function in the drain channel 140. Therefore, a separate valve body structure need not be provided in the drain channel 140. When switching modes in the pre-filter, only the valve body at the water outlet 202 and the reversing member 720 need to be operated accordingly. Of course, in other embodiments, the movable member 730 can also achieve separation of the spaces on both sides by cooperating with other structures, such as the inner circumferential wall of the filter bottle 10 or a corresponding bracket structure installed within the filter bottle 10.

[0076] In one embodiment, please refer to Figure 2 、 Figure 4 and Figure 7 The sewage discharge channel 140 has a first channel 141 and a second channel 142 that are coaxially connected, and the first channel 141 is located on a side close to the water filter chamber 101; the movable part 730 also includes a avoidance portion 733, and the avoidance portion 733 is connected to a side of the blocking portion 731 close to the valve head 20; in the filtering mode, the blocking portion 731 blocks the first channel 141, and in the flushing mode, the blocking portion 731 is in the second channel 142 and is clearance-matched with the second channel 142, and the avoidance portion 733 passes through the first channel 141 and is clearance-matched with the first channel 141. It can be understood that the inner diameter of the second channel 142 is larger than the outer diameter of the sealing portion 731, the inner diameter of the first channel 141 is larger than the outer diameter of the avoidance portion 733, the inner diameter of the second channel 142 is larger than the inner diameter of the first channel 141, the outer diameter of the blocking portion 731 is larger than the outer diameter of the avoidance portion 733, the avoidance portion 733 and the first channel 141 and the second channel 142 can all be clearance-matched, when the reversing member 720 moves, the avoidance portion 733 will not interfere with the sewage channel 140, and, in the flushing mode, the avoidance portion 733 and the blocking portion 731 will not block the sewage channel 140, so that the sewage channel 140 is opened, and the filter chamber can be connected to the sewage pipe through the gap between the second channel 142 and the avoidance portion 733 and the gap between the first channel 141 and the blocking portion 731 in sequence.

[0077] In one embodiment, please refer to Figure 2 、 Figure 4 and Figure 7, the outer periphery of the blocking portion 731 is provided with a sealing ring 1002. In the filtering mode, the blocking portion 731 is located in the first channel 141, and the outer periphery of the sealing ring 1002 abuts against the inner peripheral wall of the first channel 141. At this time, the outer diameter of the blocking portion 731 should be equal to or slightly smaller than the inner diameter of the first channel 141. In this way, the blocking portion 731 can achieve sealing cooperation with the inner peripheral wall of the first channel 141 through the sealing ring 1002 provided on the outer periphery, thereby achieving sealing of the first channel 141. Among them, the cross-section of the sealing ring 1002 can be circular, peanut-shaped, or V-shaped. Of course, in other embodiments, in the filtering mode, the blocking portion 731 can also abut against the step surface at the connection between the first channel 141 and the second channel 142, and the end side of the first channel 141 is blocked by the end side of the blocking portion 731, thereby achieving sealing of the first channel 141. At this time, the outer diameter of the blocking portion 731 should be larger than the inner diameter of the first channel 141.

[0078] In one embodiment, the pre-filter also includes a reversing member 720 that is transmission-connected to the movable member 730, a water-isolating ring 203 is provided between the water inlet 201 and the water outlet 202, the water inlet 201 is connected to the outer peripheral side of the water-isolating ring 203, and the water outlet 202 is connected to the inner peripheral side of the water-isolating ring 203, the reversing member 720 is axially movably inserted into the water-isolating ring 203 and the filter assembly 30, the reversing member 720 includes a connecting portion 721 and a blocking portion 722, the flushing flow path between the water inlet 201 and the reversing member 720 is connected through the connecting portion 721 and is cut off through the blocking portion 722.

[0079] In this embodiment, the pre-filter is a backwash filter. In flushing mode and filtering mode, the direction of water flowing through the filter assembly 30 is opposite. This flow direction is switched by the diverter 720. The user can use the driver 800 to drive the movable member 730 and the diverter 720 to move together. The movement of the diverter 720 relative to the filter assembly 30 and the water barrier ring 203 changes the communication relationship between the different structures, thereby changing the flow direction of raw water entering the water inlet 201 and the flow path of water within the water filter chamber 101. This enables the pre-filter to switch between filtering mode and flushing mode, and realizes self-flushing of the filter assembly 30 within the pre-filter. This eliminates the need for manual disassembly and cleaning, facilitates cleaning of the pre-filter, and thereby increases the service life of the pre-filter. Of course, in other embodiments, the movable member 730 and the diverter 720 can also be driven by different drive structures. Alternatively, the diverter 720 or other components can be formed with a corresponding water barrier structure that cooperates with the valve head 20 to perform the function of the water barrier ring 203 in this embodiment.

[0080] In one embodiment, please refer to Figures 10 to 12The filter assembly 30 includes a water distributor 60 and a filter module 300 connected in an axial direction. A water flow cavity 340 is formed inside the filter module 300. The filter module 300 also has a first water flow port 330 and a second water flow port 350 communicating with the water flow cavity 340. The filter module 300 includes a filter element 320, which is disposed at the second water flow port 350. The water distributor 60 has a first water flow space 610 corresponding to the first water flow port 330 and a second water flow space 620 corresponding to the second water flow port 350. A guide vane 621 is disposed in the second water flow space 620. The reversing element 720 extends into the water flow cavity 340 through the first water flow space 610. That is, the filtration flow path between the water inlet 201 and the outer periphery of the filter module 300 can be connected through the second water flow space 620. The barrier 722 can block the filtration flow path by covering the second water flow space 620, while the filtration flow path between the inner periphery of the filter module 300 and the water outlet 202 can be connected through the first water flow space 610. Furthermore, when water flows through the second water flow space 620 and into the water filter chamber 101, a swirling flow is formed, which disturbs the water flow and prevents the accumulation of impurities.

[0081] It can be understood that in the filtration flow path of the pre-filter, the second water inlet 350, the water passage cavity 340, and the first water inlet 330 are sequentially arranged along the upstream and downstream sides. That is, when the pre-filter is in filtration mode, water entering from the water inlet 201 will flow through the second water inlet 350, the water passage cavity 340, and the first water inlet 330 in sequence to the water outlet 202. In other words, the water will flow from the outside of the filter module 300 to the inside of the filter module 300. However, when the pre-filter is in flushing mode, since the pre-filter is a backwash type, the flow direction of the water in the filter module 300 will change, flowing from the inside of the filter module 300 to the outside of the filter module 300. In other words, the water will flow from the water passage cavity 340 through the second water inlet 350 to the water filtration cavity 101 on the outer peripheral side of the filter module 300.

[0082] Please also refer to Figure 2 and Figure 3When the reversing member 720 is driven to the position corresponding to the filtering mode, the position of the blocking portion 722 can avoid the filtering flow path between the water inlet 201 and the second water flow space 620, and cut off the flushing flow path between the water inlet 201 and the inner circumference of the reversing member 720, so that the filtering flow path from the water inlet 201 to the water filter chamber 101 through the second water flow space 620 is connected. At this time, since the sewage outlet 102 is closed and the water outlet 202 is opened, after the raw water enters from the water inlet 201, it can directly pass through the second water flow space 620 to the filter assembly 30 for filtration, and flow from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water, and the filtered water flows to the water outlet 202 through the inner circumference of the reversing member 720.

[0083] Please also refer to Figure 2 and Figure 6 When the reversing member 720 is driven to the position corresponding to the flushing mode, the position of the blocking portion 722 can isolate the water inlet 201 and the second water flow space 620, so as to isolate the filtration flow path between the water inlet 201 and the water filter chamber 101. The position of the connecting portion 721 can allow the water inlet 201 to communicate with the inner circumference of the reversing member 720, so as to conduct the flushing flow path from the water inlet 201 to the water filter chamber 101 through the inner circumference of the reversing member 720. At this time, since the sewage outlet 102 is open and the water outlet 202 is closed, the raw water enters from the water inlet 201, enters the inner circumference of the reversing member 720 through the connecting portion 721, and then flows to the filter assembly 30 to flush the filter assembly 30, and finally is discharged from the sewage outlet 102.

[0084] Among them, the connecting portion 721 and the blocking portion 722 are integrally formed on the reversing member 720, which not only facilitates the assembly of the reversing member 720, but also ensures the overall strength of the reversing member 720, and avoids the installation gap between the connecting portion 721 and the blocking portion 722, which may cause accidental water leakage into the reversing member 720 and cause water flow turbulence.

[0085] In one embodiment, the water-isolating ring 203 and the water distributor 60 are jointly constructed to form a water-passing structure, and the water-passing structure is connected to the water inlet 201; on the adjacent side of the water distributor 60 and the water-isolating ring 203, the water-passing structure is separated from the connecting portion 721 in the filtering mode, and is connected to the connecting portion 721 in the flushing mode.

[0086] In this embodiment, the water flow structure is formed by the water isolation ring 203 and the water distributor 60. The switching member 720 switches between different positions, which can change the relative positions of the blocking portion 722 and the connecting portion 721 with the water flow structure, thereby controlling the connection and disconnection between the water flow structure and the corresponding space, thereby connecting or blocking the corresponding flow path. Of course, in other embodiments, the water flow structure can also be formed only on the water isolation ring 203.

[0087] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 8 The water separator 203 and the water distributor 60 are spaced apart, the water-passing structure is the space between the water separator 203 and the water distributor 60, and the connecting portion 721 and the blocking portion 722 are distributed along the axial direction;

[0088] In the filtering mode, the blocking portion 722 is at least located between the water isolation ring 203 and the water distributor 60 , so that the water inlet 201 is connected to the second water flow space 620 ;

[0089] In the flushing mode, the communication portion 721 is at least partially located between the water isolation ring 203 and the water distributor 60 , so that the communication portion 721 is connected to the water inlet 201 , and the blocking portion 722 blocks the second water flow space 620 .

[0090] In this embodiment, the water-passing structure is configured as the gap between the water-isolating ring 203 and the water distributor 60. The connecting portion 721 and the blocking portion 722 are axially distributed, and the reversing member 720 is axially movable relative to the filter bottle 10. In different modes, the reversing member 720 moves axially to adjust the connecting portion 721 and the blocking portion 722 relative to the gap between the water-isolating ring 203 and the water distributor 60.

[0091] When the barrier portion 722 is arranged relative to the interval between the water-isolating ring 203 and the water distributor 60, the barrier portion 722 is at least located between the water-isolating ring 203 and the water distributor 60, and the interval thereat is divided into two parts by the barrier portion 722, one part is on the outer peripheral side of the reversing member 720, and the other part is on the outer peripheral side of the reversing member 720. The two parts are not directly connected here, but form the following filtration flow path: the raw water flows from the water inlet 201 through the second water flow space 620 to the water filter chamber 101, and in the water filter chamber 101, flows from the outer peripheral side of the filter component 30 to the inner peripheral side of the filter component 30, and then flows from the outer peripheral side of the reversing member 720 to the inner peripheral side of the reversing member 720, and finally flows to the water outlet 202.

[0092] When the connecting portion 721 is arranged relative to the interval between the water-isolating ring 203 and the water distributor 60, the connecting portion 721 is at least partially located between the water-isolating ring 203 and the water distributor 60. In this way, at this interval, the outer peripheral side of the reversing member 720 can be connected to the inner peripheral side of the reversing member 720 through the connecting portion 721. Since the blocking portion 722 blocks the second water flow space 620, the raw water flows from the water inlet 201 through the connecting portion 721 to the inner periphery of the reversing member 720, and then at the position corresponding to the filter assembly 30, it flows from the inner periphery of the reversing member 720 through the filter assembly 30 to the water filter chamber 101 on the outer peripheral side of the filter assembly 30, thereby flushing the filter assembly 30 and finally flowing to the sewage outlet 102.

[0093] Among them, the direction from the connecting part 721 to the blocking part 722 can be the direction from the water isolation ring 203 to the water distributor 60, or it can be that the blocking part 722 includes two parts that block the second water flow space 620 and the gap between the water isolation ring 203 and the water distributor 60, and the two parts are respectively located on both sides of the axial direction of the connecting part 721, and the part that blocks the second water flow space 620 is on the side of the water distributor 60 away from the water isolation ring 203.

[0094] In other embodiments, the water passing structure can be configured as a through-hole. In one embodiment, the water isolating ring 203 and the water distributor 60 are integrally formed, and the water passing structure can be configured as a through-hole provided in the water isolating ring 203 and the water distributor 60; in another embodiment, the water isolating ring 203 and the water distributor 60 are separately formed, and the water isolating ring 203 and the water distributor 60 are abutted and assembled to form a through-hole.

[0095] And when the water-passing structure is configured as a through-hole, the connecting portion 721 and the blocking portion 722 can be distributed along the circumference of the reversing member 720, that is, the connection relationship between different structures is changed by rotating the reversing member 720 relative to the water distributor 60 and the water-isolating ring 203 to realize the switching between the filtering mode and the flushing mode. At this time, in the filtering mode, the through-hole and the connecting portion 721 are circumferentially misaligned. Of course, the connecting portion 721 and the blocking portion 722 can also be distributed along the axial direction of the reversing member 720, that is, the reversing member 720 realizes the switching between the filtering mode and the flushing mode through axial movement. At this time, in the filtering mode, the through-hole and the connecting portion 721 are axially misaligned.

[0096] In one embodiment, the water distributor 60 and the water isolation ring 203 are axially opposed and spaced apart. In the filtering mode, the axial sides of the baffle 722 are respectively connected to the water distributor 60 and the water isolation ring 203 and spaced apart from the second water flow space 620. In the flushing mode, the connecting portion 721 is at least partially located between the water distributor 60 and the water isolation ring 203 and covers the second water flow space 620. In this way, in the filtering mode, the baffle 722 can be used to isolate the water inlet 201 and the inner circumference of the reversing member 720 on the adjacent side of the water distributor 60 and the water isolation ring 203, and the water inlet 201 will also be connected to the water filter chamber 101 on this side through the second water flow space 620. In the flushing mode, the water inlet 201 and the inner circumference of the reversing member 720 can be connected through the connecting portion 721 on the adjacent side of the water distributor 60 and the water isolation ring 203.

[0097] Specifically, the baffle portion 722 includes an annular main portion 7221 extending axially along the reversing member 720, and a baffle skirt 7222 disposed around the outer periphery of the annular main portion 7221. The annular main portion 7221 is connected to the connecting portion 721 and is slidably connected to the water distributor 60. The baffle skirt 7222 is located between the water distributor 60 and the water ring 203. In flushing mode, the baffle skirt 7222 abuts the outer periphery of the second water flow space 620 against the water distributor 60 to seal the second water flow space 620. In filtration mode, a gap is defined between the baffle skirt 7222 and the water distributor 60, and the outer periphery of the baffle skirt 7222 is spaced apart from the inner periphery of the filter bottle 10, allowing the water inlet 201 to communicate with the second water flow space 620 through the gap.

[0098] In one embodiment, a filtering structure is provided around the circumference of the connecting portion 721. Specifically, the circumferential wall of the connecting portion 721 includes a porous structure that communicates with the water inlet 201. This allows raw water flowing from the water inlet 201 into the water filter chamber 101 to pass through during flushing mode, allowing the raw water to flow into the inner circumference of the filter assembly 30 and clean the filter assembly 30 from the inside out. However, this raw water may contain impurities. If not filtered, these impurities may be trapped within the inner circumference of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 switches from flushing mode to filtering mode, these impurities flow out of the water outlet 202 along with the filtered raw water, resulting in a poor initial filtration effect. Therefore, a filtering structure is also provided around the circumference of the connecting portion 721. This filtering structure is often configured as a filter screen, which is fixed to the inside or outside of the porous structure or integrally formed with the connecting portion 721. The filter screen can be bonded to the connecting portion 721. In other embodiments, the filtering structure may also be directly provided on the periphery of the water isolation ring 203 by other fixed structures, so that the raw water flowing out of the water inlet 201 is filtered by the filtering structure and then flows to the connecting portion 721 .

[0099] In this embodiment, please refer to Figure 2 and Figure 8 The reversing member 720 further includes a hollow pipe section 723. The connecting portion 721, the blocking portion 722, and the hollow pipe section 723 are sequentially distributed along the axial direction. The connecting portion 721 is plugged into the water stop ring 203, and the blocking portion 722 is plugged into the water distributor 60. The hollow pipe section 723 extends into the filter module 300. It can be understood that the axis of the hollow pipe section 723 is parallel to or even coincides with the axis of the filter bottle 10. The peripheral wall of the hollow pipe section 723 is provided with a through hole that communicates with the water filter chamber 101. In the flushing mode, the water flow entering the reversing member 720 from the connecting portion 721 can be guided to the inner periphery of the filter assembly 30 through the hollow pipe section 723.

[0100] In the filtering mode, raw water enters the water filter chamber 101 from the water inlet 201, flows to the filter assembly 30 through the second water flow space 620 of the water distributor 60, and flows from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water. After the filtered raw water enters the inner periphery of the filter assembly 30, it can enter the hollow pipe section 723, and then flow upward to the water outlet 202 under the action of water pressure; in the flushing mode, raw water enters the water filter chamber 101 from the water inlet 201, enters the inner periphery of the reversing member 720 through the connecting part 721, and continues to flow downward to the hollow pipe section 723, and then sprays toward the filter assembly 30, so that the cleaning water flow is sprayed from outside to inside along the radial direction of the filter assembly 30 to take away impurities on the filter assembly 30, thereby achieving the purpose of flushing the filter assembly 30, and then flows out from the sewage outlet 102.

[0101] In one embodiment, please refer to Figure 2 、 Figure 5 and Figure 8 The movable member 730 is fixedly connected to the reversing member 720. Thus, when the reversing member 720 is driven to move axially, it can drive the movable member 730 to move axially synchronously, causing the blocking portion 731 to move correspondingly within the sewage discharge passage 140. Of course, in other embodiments, the reversing member 720 and the movable member 730 can also be connected through an intermediate structure. For example, the reversing member 720 and the movable member 730 can be plugged in so as to be axially movable, with an elastic member connected therebetween to transmit axial movement.

[0102] Specifically, the reversing member 720 includes a hollow tube section 723, and the hollow tube section 723 and the movable member 730 are fixedly connected on the inner periphery of the filter assembly 30. Specifically, the avoidance portion 733 further includes a connecting portion 732 at one end away from the blocking portion 731, and the connecting portion 732 extends into the filter assembly 30 and is connected to the hollow tube section 723. The movable member 730 and the reversing member 720 can be connected by threads, that is, one of the hollow tube section 723 and the connecting portion 732 is provided with a screw hole, and the other is provided with an external thread, and the two are fixedly connected by screw connection. In this way, the movable member 730 and the reversing member 720 are formed separately, and different materials can be selected for processing and forming to meet the requirements of reversing and blocking respectively. Of course, in other embodiments, the reversing member 720 and the blocking portion 731 can also be formed as one piece.

[0103] In one embodiment, the driving member 800 includes a driving screw 810. Among the valve head 20 and the movable member 730, one is rotatably connected to the driving screw 810 and fixed in the axial direction, and a threaded structure is provided between the other and the driving screw 810.

[0104] Without loss of generality, the drive screw 810 is indirectly connected to the movable member 730 by being connected to the reversing member 720. That is, in this embodiment, the reversing member 720 may be screwed to the drive screw 810 via a screw connection structure. The drive screw 810 can rotate relative to the valve head 20, but is fixedly arranged relative to the valve head 20 in the axial direction. In this way, when the drive screw 810 is rotated by the user, the drive screw 810 does not move axially relative to the valve head 20, but only rotates. Due to the threaded fit between the screw connection structure and the drive screw 810, the reversing member 720 is driven to move axially relative to the valve head 20, thereby achieving switching of the reversing member 720 between different axial positions.

[0105] Alternatively, the valve head 20 is screwed to the drive screw 810 through a screw structure, and the drive screw 810 can rotate relative to the reversing member 720, but is axially fixed relative to the reversing member 720. In this way, when the drive screw 810 is rotated by the user, the drive screw 810 can move axially relative to the valve head 20. Since the drive screw 810 and the reversing member 720 are relatively fixed in the axial direction, the reversing member 720 will be driven to move axially together. Moreover, since the drive screw 810 and the reversing member 720 are rotatably arranged, the reversing member 720 will not be driven to rotate by the drive screw 810, which can reduce the movement of the reversing member 720 relative to the water-blocking ring 203 and the filter assembly 30, thereby reducing friction.

[0106] In this embodiment, the driving member 800 drives the reversing member 720 to move axially through a threaded connection. Of course, in other embodiments, the reversing member 720 can be axially driven by a worm gear mechanism, or the driving member 800 can drive the reversing member 720 to rotate through an appropriate method.

[0107] In one embodiment, see Figure 9 The threaded connection structure is configured as a mounting bracket 740 fixedly mounted within the diverter 720. The drive screw 810 is threadedly connected to the mounting bracket 740 and is rotatably connected to the valve head 20 and axially fixed. Specifically, a threaded hole is provided at the center of the mounting bracket 740, into which the drive screw 810 is threadedly engaged, thereby achieving a threaded connection between the diverter 720 and the drive screw 810. The mounting bracket 740 has multiple water-passing holes spaced around the circumference of the threaded hole, allowing the spaces on both axial sides of the inner circumference of the diverter 720 to communicate, thereby not affecting the flow of water within the diverter 720. In addition, the mounting bracket 740 can, of course, in other embodiments, an internal thread can be set on the inner circumference of the reversing member 720, the driving screw 810 can be fixedly sleeved on the outside of the mounting bracket 740, and an external thread can be set on the outer circumference of the mounting bracket 740. The screw connection between the mounting bracket 740 and the reversing member 720 can be realized.

[0108] In one embodiment, the mounting bracket 740 is detachably connected to the diverter 720. This allows for the removal of either the mounting bracket 740 or the diverter 720 if structural damage occurs, allowing the damaged component to be replaced, thereby reducing pre-filter maintenance costs. In other embodiments, the mounting bracket 740 and the diverter 720 may be integrally formed, or the two may be separately formed and then fixedly connected via welding or adhesive bonding.

[0109] In one embodiment, the mounting bracket 740 is snap-connected to the reversing member 720. Of course, in other embodiments, the mounting bracket 740 and the reversing member 720 may also be connected by plugging, snapping, or screwing.

[0110] Specifically, the mounting bracket 740 includes an inner ring portion 741 and an outer ring portion 742, which are connected to each other. The drive screw 810 is threadedly connected to the inner ring portion 741, and the outer ring portion 742 is snap-fitted to the switching member 720. In other words, the mounting bracket 740 is provided with ring portions on both the inner and outer peripheries. The inner periphery of the inner ring portion 741 is formed with screw holes for the drive screw 810 to be threadedly connected, and the outer ring portion 742 is capable of affixing to the inner periphery of the switching member 720 to ensure that the mounting bracket 740 can be stably snapped onto the switching member 720. Of course, in other embodiments, the outer periphery of the mounting bracket 740 may not be provided with a ring portion.

[0111] In one embodiment, a plurality of axially extending connecting arms 743 are connected to one axial side of the outer ring portion 742. The plurality of connecting arms 743 are spaced apart circumferentially. The connecting arms 743 are provided with engaging protrusions 744. The reversing member 720 is provided with corresponding buckling grooves, and the engaging protrusions 744 engage with the buckling grooves. The inner ring portion 741 is disposed opposite the connecting arms 743 and is connected to the plurality of connecting arms 743 in a one-to-one correspondence via a plurality of circumferentially distributed connecting ribs 745. That is, the inner ring portion 741 and the outer ring portion 742 are axially staggered. The outer ring portion 742 is buckled with the reversing member 720 via the connecting arms 743. The inner ring portion 741 is disposed opposite the connecting portion 732. This facilitates shortening the force transmission path between the reversing member 720 and the drive screw 810, thereby facilitating driving of the reversing member 720. The inner ring portion 741 and the outer ring portion 742 are connected one-to-one by multiple connecting ribs 745 and multiple connecting arms 743, which is beneficial to enhancing the structural strength of the mounting bracket 740 and increasing the number of force transmission paths between the reversing member 720 and the driving screw 810, thereby avoiding stress concentration between the two. The mounting bracket 740 is not easily damaged, which is beneficial to ensuring the connection stability between the reversing member 720 and the driving screw 810.

[0112] In one embodiment, the buckle groove is formed in the barrier portion 722 , and the outer ring portion 742 is exposed at a port of the reversing member 720 . Specifically, the outer ring portion 742 is exposed at a port on a side of the connecting portion 721 away from the barrier portion 722 . Specifically, the connecting portion 721 and the blocking portion 722 are distributed axially from the water isolation ring 203 to the water distributor 60, and the connecting portion 721 has a hole-like structure distributed circumferentially. The mounting bracket 740 is inserted from one side of the connecting portion 721 to the inner circumference of the reversing member 720, wherein the end face of the outer ring portion 742 is preferably flush with the end face of the reversing member 720, and the connecting arm 743 extends into the inner circumference of the reversing member 720 relative to the blocking portion 722. A snap-fitting protrusion 744 is provided at the end of the connecting arm 743, which is snapped into the buckle groove of the blocking portion 722 through the snap-fitting protrusion 744. In this way, the connection stability between the mounting bracket 740 and the reversing member 720 can be guaranteed, and the mounting bracket 740 has little obstruction effect on the water flow at the connecting portion 721. Furthermore, the inner ring portion 741 is located relative to the blocking portion 722, and the inner ring portion 741 will not block the water flow at the connecting portion 721.

[0113] In one embodiment, please refer to Figure 2 、 Figure 3 and Figure 6 The driving member 800 further includes a driving knob 820, which is fixed to the end of the driving screw 810 and is located outside the valve head 20. In this way, the user can rotate the driving knob 820 to drive the driving screw 810 to rotate relative to the valve head 20. The outer diameter of the driving knob 820 can be set to be larger than the outer diameter of the driving screw 810. Furthermore, anti-slip grooves can be provided on the outer periphery of the driving knob 820, or a flat portion can be provided on the end surface of the driving knob 820 to facilitate user operation. Of course, in other embodiments, the end of the driving screw 810 can also be exposed to the valve head 20 and provided with a flat portion, so that the user can use a wrench to act on the driving screw 810, thereby driving the driving screw 810 to rotate.

[0114] In one embodiment, the drive knob 820 is rotatably connected to the valve head 20 and is axially limited in engagement with the valve head 20, such that the two are relatively fixed in the axial direction. Thus, the limited engagement of the drive knob 820 and the valve head 20 allows the drive screw 810 to be axially fixed relative to the valve head 20, thereby ensuring the transmission of motion between the drive screw 810 and the reversing member 720. Specifically, a groove may be provided on the outer side of the valve head 20, and the drive knob 820 may be at least partially accommodated within the groove. An annular groove may be provided on the inner wall of the groove or on the outer periphery of the drive knob 820, and a protrusion may be provided on the other side to be slidably connected to the annular groove. The protrusion may be annular, may be provided at a single point, or may be provided in multiple locations spaced apart along the circumference. Thus, through the engagement of the annular groove and the protrusion, the drive knob 820 and the drive screw 810 may be axially fixed relative to the valve head 20 and may rotate relative to the valve head 20. Of course, in other embodiments, the driving screw 810 may be axially limited and engaged with the valve head 20 .

[0115] It should be noted that the multiple indicated in this solution should be understood as greater than or equal to two unless otherwise specified.

[0116] The present invention also provides a water system including a prefilter. The specific structure of the prefilter is similar to that of the above-described embodiments. Since the present water system utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects of the technical solutions of the above-described embodiments, and therefore will not be further detailed here. The water system includes at least the relevant components from the prefilter to the water supply terminal. For example, the water system may include household appliances such as a water heater, a dishwasher, and a water dispenser, as well as accessories such as water pipes for household water supply.

[0117] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet communicating with the water filter cavity, and a sewage outlet is provided on a side of the filter bottle away from the valve head; A filter assembly is arranged in the water filter cavity; as well as a driving member and a movable member, wherein the driving member is drivingly connected to the movable member and is exposed on the outside of the pre-filter, the movable member is movably disposed in the water filter chamber to enable the pre-filter to switch between a filtering mode and a flushing mode, the water inlet and the water outlet are disposed on one side of the movable member, and the sewage outlet is disposed on the other side of the movable member; The spaces on opposite sides of the movable member are isolated in the filtering mode and connected in the flushing mode.

2. The prefilter according to claim 1, wherein The pre-filter further comprises a sewage discharge assembly, which is mounted on a side of the filter bottle away from the valve head. The sewage discharge assembly forms a sewage discharge channel, and the sewage discharge port is located on a side of the sewage discharge channel away from the valve head.

3. The prefilter according to claim 2, wherein: The movable member includes a blocking portion, which blocks the drain channel in the filtering mode and opens the drain channel in the flushing mode.

4. The prefilter according to claim 3, characterized in that The sewage discharge channel comprises a first channel and a second channel which are coaxially connected, wherein the first channel is located on a side close to the water filter chamber; The movable member further includes a relief portion connected to a side of the blocking portion close to the valve head; In the filtering mode, the blocking portion blocks the first channel. In the flushing mode, the blocking portion is in the second channel and is gapped with the second channel. The avoidance portion passes through the first channel and is gapped with the first channel.

5. The pre-filter according to claim 4, characterized in that A sealing ring is sleeved on the outer periphery of the blocking portion. In the filtering mode, the blocking portion is located in the first channel, and the outer periphery of the sealing ring abuts against the inner peripheral wall of the first channel.

6. The prefilter according to claim 1, wherein: The driving member includes a driving screw, which is rotatably connected to the valve head and fixed in the axial direction. The movable member is connected to the driving screw via a screw connection structure.

7. The prefilter according to claim 6, wherein: The screw connection structure is configured as a mounting bracket. The pre-filter further comprises a reversing member fixedly connected to the movable member. The mounting bracket is fixed to the reversing member. The driving screw is screwed to the mounting bracket.

8. The pre-filter according to claim 7, characterized in that The mounting bracket is detachably connected to the reversing member.

9. The prefilter according to claim 8, characterized in that The mounting bracket comprises an inner ring portion and an outer ring portion which are connected to each other. The driving screw is screwed to the inner ring portion. The outer ring portion is snap-connected to the reversing member.

10. The pre-filter according to claim 9, characterized in that The outer ring portion is connected to a plurality of connecting arms extending in the axial direction, and the plurality of connecting arms are distributed at intervals in the circumferential direction. The connecting arms are provided with a snap-fitting protrusion, and the reversing member is correspondingly provided with a buckle groove, and the snap-fitting protrusion is buckled with the buckle groove. The inner ring portion is arranged opposite to the connecting arms, and is connected to the plurality of connecting arms one by one through a plurality of connecting ribs distributed in the circumferential direction.

11. The prefilter according to claim 6, wherein The driving member further includes a driving knob, which is fixed to the driving screw and passes through the valve head to be exposed on the outside of the valve head.

12. The pre-filter according to claim 11, characterized in that The driving knob is rotatably connected to the valve head and is fixed relative to the valve head in the axial direction.

13. The pre-filter according to claim 1, wherein: The valve head includes a metal outer shell and a plastic inner lining. The metal outer shell and the filter bottle are connected via fasteners, and the plastic inner lining is sealed and fitted in the filter bottle.

14. The pre-filter according to claim 1, wherein The pre-filter also includes a reversing member fixedly connected to the movable member, a water-isolating ring is provided between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water-isolating ring, and the water outlet is connected to the inner peripheral side of the water-isolating ring, the reversing member is axially movably inserted into the water-isolating ring and the filter assembly, the reversing member includes a connecting portion and a blocking portion, the flushing flow path between the water inlet and the reversing member is connected through the connecting portion and cut off by the blocking portion.

15. The pre-filter according to claim 14, characterized in that The filter assembly includes a water distributor and a filter module connected in an axial direction, a water flow cavity is formed inside the filter module, and the filter module also forms a first water flow port and a second water flow port connected to the water flow cavity, the filter module includes a filter element, and the filter element is arranged at the second water flow port, the water distributor has a first water flow space corresponding to the first water flow port and a second water flow space corresponding to the second water flow port, a guide blade is provided in the second water flow space, and the reversing element extends into the water flow cavity through the first water flow space.

16. The pre-filter according to claim 15, characterized in that The reversing member also includes a hollow pipe section, the connecting portion, the blocking portion and the hollow pipe section are distributed in sequence along the axial direction, the connecting portion is plug-fitted with the water isolation ring, the blocking portion is plug-fitted with the water distributor, and the hollow pipe section extends into the filter module.

17. The pre-filter according to claim 16, wherein: The water distributor and the water isolation ring are arranged opposite to each other and spaced apart in the axial direction. In the filtering mode, the axial sides of the blocking portion are respectively connected to the water distributor and the water isolation ring, and are spaced apart from the second water flow space. In the flushing mode, the connecting portion is at least partially located between the water distributor and the water isolation ring, and covers the second water flow space.

18. The pre-filter according to claim 16, wherein: The connection between the movable part and the hollow pipe section is located in the water passage cavity; And / or, the movable part and the hollow pipe section are threadedly connected.

19. A water system, characterized in that: The method comprises the pre-filter according to any one of claims 1 to 18.

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